CN109490173B - Uranium tailing pond uranium tailings and permeability testing device and testing method for lower lying rock-soil layer - Google Patents

Uranium tailing pond uranium tailings and permeability testing device and testing method for lower lying rock-soil layer Download PDF

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CN109490173B
CN109490173B CN201811606774.3A CN201811606774A CN109490173B CN 109490173 B CN109490173 B CN 109490173B CN 201811606774 A CN201811606774 A CN 201811606774A CN 109490173 B CN109490173 B CN 109490173B
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pressure
liquid
electromagnetic valve
rock
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CN109490173A (en
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刘永
李向阳
潘宇翔
娄亚龙
彭国文
房琦
雷波
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Nanhua University
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Nanhua University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The device comprises a gas pressure regulating injection system, a liquid pressure regulating injection system, a pressure measuring system, an excitation system, a back pressure system, a flow metering system, a data acquisition unit and a thermostat, wherein the systems are connected through pipeline lines. The underground environment is simulated through the testing device, the gas-liquid mixture, the permeability of single gas and single liquid and the change rule of the permeability along with time of the underground lying rock-soil layer and the uranium tailings in different depths, different temperatures and different vibration frequencies of the uranium tailing pond are tested, and the theoretical basis is provided for environmental protection and seepage stability evaluation of the uranium tailing pond.

Description

Uranium tailing pond uranium tailings and permeability testing device and testing method for lower lying rock-soil layer
Technical Field
The invention relates to the field of safety engineering of uranium tailing ponds, in particular to a testing device and a testing method for testing permeability of uranium tailings and a lower lying rock-soil layer of a uranium tailing pond.
Background
Uranium tailings permeability is one of the indispensable parameters in the research of seepage theory. The test to uranium tailings permeability of uranium tailings storehouse not only can assess reservoir water level change and the seepage state and the stability of uranium tailings dam under the heavy rainfall, also can predict the risk that harmful substance pollutes reservoir area groundwater in the uranium tailings. Meanwhile, for uranium tailing dams of different types and heights, due to artificial or natural effects, different osmotic pressures can be formed on the dam body by the rising of the reservoir water body, so that osmotic destruction can be generated inside the uranium tailing dam, and therefore the qualitative relation between the water inlet pressure and the osmotic coefficient of uranium tailings under a certain degree of compaction and the stability relation between time and the osmotic coefficient must be researched.
The waste water in the uranium tailing pond has pollution risk to the underground water in the pond area. For a lower lying rock-soil layer with lower permeability and separated by a submerged layer and a confined water layer, the migration rule of pollutants by different confining pressures, osmotic pressures, temperatures and solutions and the change rule of the permeability of the lower lying rock-soil layer along with time must be simulated.
In the past experiment and device equipment research, influenced by fields such as technology, specialty, etc., there is no device that can simulate the test of uranium tailings and the permeability of the underlying rock-soil layer and the change rule of the permeability along with time comprehensively and accurately in the underground environment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device and a method for testing the permeability of uranium tailings in a uranium tailing pond and a lower lying rock-soil layer, so as to simulate and test the permeability of gas, liquid or gas-liquid mixture in vibrating strata of the uranium tailings and the lower lying rock-soil layer at different depths, different temperatures and different frequencies.
The technical scheme of the invention is as follows: uranium tailings of a uranium tailing pond and permeability testing device of a lower lying rock-soil layer comprise a gas pressure regulating injection system, a liquid pressure regulating injection system, a pressure measuring system, an excitation system, a back pressure system, a flow metering system, a data acquisition unit and a thermostat.
The gas pressure-regulating injection system comprises a carbon dioxide gas storage tank, a nitrogen gas storage tank, a booster pump, a first gas mass flow controller, a second gas mass flow controller, a third gas mass flow controller, a first pressure real-time collector digital display meter, a second pressure real-time collector digital display meter, a high-pressure regulating valve, a low-pressure regulating valve and electromagnetic valves V1-V9.
The carbon dioxide gas storage tank is connected with the gas inlet end of the first gas mass flow controller through an electromagnetic valve V1, the nitrogen gas storage tank is connected with the gas inlet end of the second gas mass flow controller through an electromagnetic valve V2, the booster pump is respectively connected with the gas inlet end of the first gas mass flow controller and the gas inlet end of the second gas mass flow controller, the gas outlet end of the first gas mass flow controller and the gas outlet end of the second gas mass flow controller are connected with the gas inlet end of an electromagnetic valve V3, the gas outlet end of an electromagnetic valve V3 is connected with the gas inlet end of a high-pressure regulating valve, the gas outlet end of the high-pressure regulating valve is respectively connected with the gas inlet ends of an electromagnetic valve V4, an electromagnetic valve V6 and a first pressure real-time collector digital display meter, the gas outlet end of an electromagnetic valve V4 is connected with the gas inlet end of a low-pressure regulating valve, the gas outlet end of the low-pressure regulating valve is connected with the gas inlet end of an electromagnetic valve V, the air outlet end of the electromagnetic valve V7 is connected with the air inlet end of a third gas mass flow controller, the air outlet end of the third gas mass flow controller is connected with the air inlet ends of the electromagnetic valve V8 and the electromagnetic valve V9, and the air outlet end of the electromagnetic valve V9 is connected with the outside atmosphere and used for pressure discharge and air exhaust.
The liquid pressure-regulating injection system comprises a liquid storage container, a precision injection pump, a first piston intermediate container and a second piston intermediate container, wherein the liquid storage container is connected with the inlet end of the precision injection pump through a pipeline, and the outlet end of the precision injection pump is respectively connected with the inlet ends of the first piston intermediate container and the second piston intermediate container.
The pressure measurement system comprises a gas-liquid stirring device, a low-pressure sensor, a high-pressure sensor, a solenoid valve V10 and a solenoid valve V11, wherein a gas-liquid saturated liquid outlet end of the gas-liquid stirring device is connected with inlet ends of the solenoid valve V10 and the solenoid valve V11, an outlet end of the solenoid valve V10 is connected with an inlet end of the low-pressure sensor, and an outlet end of the solenoid valve V11 is connected with an inlet end of the high-pressure.
The excitation system include the ground sample add and hold the device, uranium tailings is filled the device, the excitation device, ring pressure device and solenoid valve V12, solenoid valve V13, solenoid valve V14, solenoid valve V15, ground sample add and hold device and uranium tailings and fill the device and install on the excitation device, the excitation device can provide the vibration of different frequencies, in order to simulate the vibration environment that test uranium tailings and ground are located, ground sample adds and holds device confining pressure ware entrance point solenoid valve and uranium tailings and fill device confining pressure ware entrance point solenoid valve and be connected with the ring pressure device respectively, solenoid valve V12 exit end and uranium tailings are filled device inlet connection, solenoid valve V13 exit end and ground sample add and hold device inlet connection, solenoid valve V14 entrance point and uranium tailings are filled device outlet connection, solenoid valve V15 entrance point and ground sample add and hold device outlet connection.
The back pressure system comprises a back pressure valve, a back pressure pump, a third pressure real-time collector digital display meter and an electromagnetic valve V16, wherein the outlet end of the back pressure pump is respectively connected with the inlet end of the third pressure real-time collector digital display meter and the inlet end of the electromagnetic valve V16, and the outlet end of the electromagnetic valve V16 is connected with the second inlet end of the back pressure valve.
The flow metering system comprises a gas-liquid separator, a dryer, a gas mass flowmeter, a first check valve, a gas collecting bag, a second check valve, a liquid storage container, a balance with a data output function and a fourth digital display meter of a real-time pressure collector, wherein the outlet end of the fourth digital display meter of the real-time pressure collector is connected with the inlet end of the gas-liquid separator, the gas outlet end of the gas-liquid separator is connected with the inlet end of the dryer, the outlet end of the dryer is connected with the inlet end of the gas mass flowmeter, the outlet end of the gas mass flowmeter is connected with the inlet end of the first check valve, the outlet end of the first check valve is connected with the gas collecting bag, the liquid outlet end of the gas-liquid separator is connected with the inlet end of the second check valve, the outlet.
The device comprises a first piston intermediate container, a second piston intermediate container, a gas-liquid stirring device, a low-pressure sensor, a high-pressure sensor, a rock-soil sample adding device, a uranium tailing filling device, an excitation device, an electromagnetic valve V10, an electromagnetic valve V11, an electromagnetic valve V12, an electromagnetic valve V13, an electromagnetic valve V14 and an electromagnetic valve V15, wherein the constant temperature box is arranged in a constant temperature box, the constant temperature box realizes temperature regulation and control of a solid-liquid-gas three-phase test medium by heating or refrigeration, and the temperature is automatically controlled by feeding back the current temperature through a detection element, so that the test is carried out under the required temperature condition.
The connection relationship of the above systems is as follows:
the outlet end of the electromagnetic valve V8 is connected with the gas inlet end of the gas-liquid stirring device, the outlet end of the precision injection pump is connected with the electromagnetic valve at the liquid inlet end of the gas-liquid stirring device, the outlet ends of the first piston intermediate container and the second piston intermediate container are connected with the electromagnetic valve at the gas-liquid saturated liquid outlet end of the gas-liquid stirring device, the outlet ends of the electromagnetic valve V12 and the electromagnetic valve V13 are connected with the first inlet end of the backpressure valve, the outlet ends of the electromagnetic valve V14 and the electromagnetic valve V15 are connected with the first inlet end of the backpressure valve, and the.
A signal end a1 of a data collector is connected with a signal end of a gas mass flowmeter through a signal line, a2 is connected with a signal end of a fourth pressure real-time collector digital display meter through a signal line, a3 is connected with a signal end of a vibration excitation device through a signal line, a4 is connected with a signal end of a ring pressure device through a signal line, a5 is connected with a signal end of a high-pressure sensor through a signal line, a6 is connected with a signal end of a low-pressure sensor through a signal line, a7 is connected with a signal end of a third pressure real-time collector digital display meter through a signal line, a8 is connected with a signal end of a third gas mass flow controller through a signal line, a9 is connected with a signal end of a second pressure real-time collector digital display meter through a signal line, a10 is connected with a signal end of a first pressure real-time collector digital display meter through a signal line, a11 is connected with a signal end of a second gas mass flow controller through, a13 is connected with the signal end of the first gas mass flow controller through a signal wire, a14 is connected with the signal end of the incubator through a signal wire, and a15 is connected with the signal end of the balance with the data output function through a signal wire.
The booster pump, the high-pressure regulating valve, the low-pressure regulating valve, the backpressure pump and the electromagnetic valve in the testing device are respectively connected with the data acquisition unit through electric control lines, and the opening and closing of the data acquisition unit are controlled by the data acquisition unit.
The invention also provides a method for testing the permeability of the lower lying rock-soil layer and the permeability of the uranium tailings by adopting the uranium tailings in the uranium tailing pond and the permeability testing device of the lower lying rock-soil layer, which comprises the steps of gas-liquid mixed measurement, single mixed gas measurement and single liquid measurement.
The method comprises the following specific steps of measuring the permeability of a lower lying rock-soil layer and the permeability of uranium tailings by gas-liquid mixing:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data acquisition device, closing all electromagnetic valves through the control of the data acquisition device, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data acquisition device, and simulating the temperature environment where uranium tailing and rock-soil are located according to test requirements to set the temperature of the incubator.
B. Preparing gas-liquid saturated liquid required by test
B1, opening the precision injection pump, the first piston intermediate container inlet electromagnetic valve and the second piston intermediate container inlet electromagnetic valve, injecting the test liquid from the liquid storage container into the first piston intermediate container and the second piston intermediate container according to the preset constant flow rate and constant pressure of the test liquid injection in the data acquisition unit, after the first piston intermediate container and the second piston intermediate container are filled with the liquid to be tested, opening the first piston intermediate container outlet electromagnetic valve, the second piston intermediate container outlet electromagnetic valve, the electromagnetic valves V12 and V13, injecting the test liquid into the rock and soil sample holding device and the uranium tailings filling device, and after the test liquid is saturated, closing the electromagnetic valves V12, V13, the first piston intermediate container inlet electromagnetic valve and the second piston intermediate container inlet electromagnetic valve;
b2, opening the electromagnetic valve V1, the electromagnetic valve V2 and the booster pump to input carbon dioxide and nitrogen, adjusting the air input through the first gas mass flow controller and the second gas mass flow controller, adjusting the proportion of the carbon dioxide and the nitrogen in the mixed gas according to the test requirement, then the electromagnetic valve V3 is opened, the mixed gas injected is regulated for the first time through the high-pressure regulating valve, the first pressure real-time collector digital display meter feeds back the gas pressure value to the data collector, if the gas pressure value required by the test is reached, opening the electromagnetic valve V6, if the first pressure regulation does not reach the gas pressure value required by the test, opening the electromagnetic valves V4 and V5, feeding the gas pressure value back to the data collector by the second pressure real-time collector digital display meter, carrying out secondary pressure regulation on the injected mixed gas through a low-pressure regulating valve so as to achieve a gas pressure value required during testing;
b3, opening an electromagnetic valve at the liquid inlet end of the gas-liquid stirring device, injecting test liquid into the gas-liquid stirring device from a liquid storage container, opening an electromagnetic valve V7 and an electromagnetic valve V8 to inject mixed gas after the gas-liquid stirring device is filled with the liquid to be tested, feeding the gas into a data acquisition unit by a third gas mass flow controller, controlling the gas inflow through the data acquisition unit, then opening a speed regulating switch of the gas-liquid stirring device, setting the stirring speed, and obtaining gas-liquid saturated liquid required by the test after stirring.
C. Testing gas-liquid permeability of lower lying rock-soil layer sample
C1, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, an electromagnetic valve V13 and an electromagnetic valve V15, injecting gas-liquid saturated liquid into the rock-soil sample adding and holding device, starting the excitation device after the gas-liquid saturated liquid enters the rock-soil sample adding and holding device, and simulating the vibration environment of rock-soil according to test requirements;
c2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end gas-liquid pressure value of the rock and soil sample confining device by adopting a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end gas-liquid pressure value of the rock and soil sample confining device by adopting the low pressure sensor, if the, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas-liquid pressure value at the inlet end of the rock-soil sample holding device;
c3, when the gas-liquid pressure value at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening a gas-liquid separator gas inlet end valve, a first one-way valve and a second one-way valve, injecting gas-liquid saturated liquid into the gas-liquid separator, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator, discharging gas from the gas outlet end of the gas-liquid separator, entering a gas collection bag through a dryer, a gas mass flowmeter and the first one-way valve, discharging liquid from the liquid outlet end of the gas-liquid separator, entering a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by a balance with a data output function;
and C4, collecting gas flow by a gas mass flowmeter, collecting liquid flow by a data output function balance, and automatically storing and processing data to obtain gas-liquid permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas-liquid flow.
D. Test of gas-liquid permeability of uranium tailings
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and removing gas and liquid in the flow metering system;
d2, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, an electromagnetic valve V12 and an electromagnetic valve V14, injecting gas-liquid saturated liquid into the uranium tailing filling device, starting an excitation device after the gas-liquid saturated liquid enters the uranium tailing filling device, and simulating a vibration environment where uranium tailing is located according to test requirements;
d3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around the uranium tailing, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the gas-liquid pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the gas-liquid pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, in the range of the high-pressure sensor, the gas-liquid pressure value at the inlet end of the uranium tailings filling device is still tested by the high-pressure sensor;
d4, when the gas-liquid pressure value at the inlet end of the uranium tailing filling device reaches the pressure required by the test, opening a gas-liquid separator gas inlet end valve, a first one-way valve and a second one-way valve, injecting gas-liquid saturated liquid into the gas-liquid separator, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator, discharging gas from the gas outlet end of the gas-liquid separator, entering a gas collecting bag through a dryer, a gas mass flowmeter and the first one-way valve, discharging liquid from the liquid outlet end of the gas-liquid separator, entering a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by a balance with a data output function;
d5, data acquisition unit pass through gas mass flow meter collection gas flow, gather the liquid flow through data output function balance to automatic save and handle data, thereby obtain the gas-liquid permeability of uranium tailings sample under different temperature, different pressure, different gas-liquid flow condition.
Secondly, the specific steps of measuring the permeability of the lower lying rock-soil layer and the permeability of uranium tailings by adopting a single mixed gas are as follows:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data acquisition device, closing all electromagnetic valves through the control of the data acquisition device, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data acquisition device, and simulating the temperature environment where uranium tailing and rock-soil are located according to test requirements to set the temperature of the incubator.
B. Preparation of the Mixed gas required for the test
Opening an electromagnetic valve V1, inputting carbon dioxide and nitrogen by an electromagnetic valve V2 and a booster pump, adjusting air inflow by a first gas mass flow controller and a second gas mass flow controller, adjusting the proportion of the carbon dioxide and the nitrogen in the mixed gas according to test requirements, then opening an electromagnetic valve V3, carrying out primary pressure adjustment on the injected mixed gas by a high-pressure adjusting valve, feeding back a gas pressure value to a data collector by a first pressure real-time collector digital display meter, opening an electromagnetic valve V6 if the gas pressure value reaches a required gas pressure value during testing, opening electromagnetic valves V4 and V5 if the gas pressure value does not reach the required gas pressure value during testing, feeding back the gas pressure value to the data collector by a second pressure acquisition meter, and carrying out secondary pressure adjustment on the injected mixed gas by a low-pressure adjusting valve so as to reach the required gas pressure value during testing.
C. And opening the electromagnetic valve V7 and the electromagnetic valve V8, injecting the mixed gas into the gas-liquid stirring device, feeding the air inflow back to the data acquisition unit by the third gas mass flow controller, and controlling the air inflow through the data acquisition unit.
D. Testing gas permeability of lower lying rock-soil layer sample
D1, after the gas-liquid stirring device is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, a solenoid valve V13 and a solenoid valve V15, injecting the mixed gas into the rock-soil sample adding and holding device, starting an excitation device after the mixed gas enters the rock-soil sample adding and holding device, and simulating the vibration environment of the rock-soil according to the test requirements;
d2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end gas pressure value of the rock and soil sample confining device by using a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end gas pressure value of the rock and soil sample confining device by using the low pressure sensor, if the test pressure value is, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas pressure value at the inlet end of the rock-soil sample holding device;
d3, when the pressure value of the gas at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a first one-way valve, injecting the mixed gas into the gas-liquid separator, discharging the mixed gas from the gas outlet end of the gas-liquid separator, and allowing the mixed gas to enter a gas collecting bag through the dryer, the gas mass flowmeter and the first one-way valve;
and D4, collecting the gas flow by the data collector through the gas mass flowmeter, and automatically storing and processing the data, thereby obtaining the gas permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas flows.
E. Testing gas permeability of uranium tailings
E1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and exhausting gas of the flow metering system;
e2, after the gas-liquid stirring device is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, a solenoid valve V12 and a solenoid valve V14, injecting the mixed gas into the uranium tailing filling device, starting an excitation device after the mixed gas enters the uranium tailing filling device, and simulating a vibration environment where rock soil is located according to test requirements;
e3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the gas pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the gas pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, and if the test, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas pressure value at the inlet end of the uranium tailings filling device;
e4, when the gas pressure value at the inlet end of the uranium tailings filling device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a first one-way valve, injecting the mixed gas into the gas-liquid separator, discharging the mixed gas from the gas outlet end of the gas-liquid separator, and allowing the mixed gas to enter a gas collecting bag through a dryer, a gas mass flowmeter and the first one-way valve;
e5, collecting the gas flow by the data collector through the gas mass flowmeter, and automatically storing and processing the data, thereby obtaining the gas permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas flows.
Thirdly, the specific steps of measuring the permeability of the lower lying rock-soil layer and the permeability of uranium tailings by adopting a single liquid are as follows:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data acquisition device, closing all electromagnetic valves through the control of the data acquisition device, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data acquisition device, and simulating the temperature environment where uranium tailing and rock-soil are located according to test requirements to set the temperature of the incubator.
B. Opening a precision injection pump, a first piston intermediate container inlet end electromagnetic valve and a second piston intermediate container inlet end electromagnetic valve, injecting the test liquid into a first piston intermediate container and a second piston intermediate container from a liquid storage container according to the preset constant flow rate and constant pressure of the test liquid injection in a data acquisition unit, after the first piston intermediate container and the second piston intermediate container are filled with the liquid to be tested, opening a first piston intermediate container outlet end electromagnetic valve, a second piston intermediate container outlet end electromagnetic valve, an electromagnetic valve V12 and an electromagnetic valve V13, injecting the test liquid into a rock soil sample holding device and a uranium tailings filling device, and closing the electromagnetic valves V12, V13, the first piston intermediate container inlet end electromagnetic valve and the second piston intermediate container inlet end electromagnetic valve after the test liquid is saturated.
C. Testing liquid permeability of lower lying rock-soil layer sample
C1, opening the electromagnetic valve at the inlet end of the first piston intermediate container, the electromagnetic valve at the inlet end of the second piston intermediate container, the electromagnetic valve V13 and the electromagnetic valve V15, and injecting liquid into the rock and soil sample holding device;
c2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end liquid pressure value of the rock and soil sample confining device by using a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end liquid pressure value of the rock and soil sample confining device by using a low pressure sensor, if the test pressure value is, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the liquid pressure value at the inlet end of the rock-soil sample holding device;
c3, when the pressure value of the liquid at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening the gas inlet end valve of the gas-liquid separator and the second one-way valve, injecting the liquid into the gas-liquid separator, discharging the liquid from the liquid outlet end of the gas-liquid separator, allowing the liquid to enter the liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by the balance with the data output function;
and C4, acquiring the liquid flow by the data acquisition unit through a data output function balance, and automatically storing and processing data to obtain the liquid permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas-liquid flow rates.
D. Testing of uranium tailings liquid permeability
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and discharging liquid of the flow metering system;
d2, opening the electromagnetic valve at the inlet end of the first piston intermediate container, the electromagnetic valve at the inlet end of the second piston intermediate container, the electromagnetic valve V12 and the electromagnetic valve V14, and injecting liquid into the uranium tailings filling device;
d3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the liquid pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the liquid pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, and if the test, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the liquid pressure value at the inlet end of the uranium tailings filling device;
d4, when the liquid pressure value at the inlet end of the uranium tailing filling device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a second one-way valve, injecting the liquid into the gas-liquid separator, discharging the liquid from the liquid outlet end of the gas-liquid separator, allowing the liquid to enter a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by using a balance with a data output function;
and D5, the data acquisition unit acquires liquid flow through the data output function balance and automatically stores and processes data, so that the liquid permeability of the uranium tailing sample under the conditions of different temperatures, different pressures and different gas-liquid flow rates is obtained.
Compared with the prior art, the invention has the following characteristics:
the testing device provided by the invention can comprehensively and accurately simulate the permeability test of the underground environment on the uranium tailings and the lower lying rock-soil layer and the change rule of the permeability along with time, and provides a theoretical basis for environmental protection and seepage stability evaluation of a uranium tailings pond.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic structural diagram of a uranium tailing and permeability testing device for a lower lying rock-soil layer in a uranium tailing pond.
Detailed Description
The first embodiment of the device for testing the permeability of the uranium tailings and the lower lying rock-soil layer in the uranium tailing pond comprises a gas pressure regulating injection system, a liquid pressure regulating injection system, a pressure measuring system, an excitation system, a back pressure system, a flow metering system, a data acquisition unit 32 and a constant temperature box 35.
The gas pressure-regulating injection system comprises a carbon dioxide gas storage tank 1, a nitrogen gas storage tank 2, a booster pump 3, a first gas mass flow controller 4, a second gas mass flow controller 5, a third gas mass flow controller 10, a first pressure real-time collector digital display meter 6, a second pressure real-time collector digital display meter 9, a high-pressure regulating valve 7, a low-pressure regulating valve 8 and electromagnetic valves V1-V9.
The carbon dioxide gas storage tank 1 is connected with the gas inlet end of a first gas mass flow controller 4 through an electromagnetic valve V1, the nitrogen gas storage tank 2 is connected with the gas inlet end of a second gas mass flow controller 5 through an electromagnetic valve V2, a booster pump 3 is respectively connected with the gas inlet end of the first gas mass flow controller 4 and the gas inlet end of the second gas mass flow controller 5, the gas outlet end of the first gas mass flow controller 4 and the gas outlet end of the second gas mass flow controller 5 are connected with the gas inlet end of an electromagnetic valve V3, the gas outlet end of an electromagnetic valve V3 is connected with the gas inlet end of a high-pressure regulating valve 7, the gas outlet end of the high-pressure regulating valve 7 is respectively connected with the gas inlet ends of an electromagnetic valve V4, an electromagnetic valve V6 and a first pressure real-time collector digital display 6, the gas outlet end of an electromagnetic valve V4 is connected with the gas inlet end of a low-pressure regulating valve 8, the gas outlet end of a low-, The air inlet end of the electromagnetic valve V7 is connected with the air inlet end of the second pressure real-time collector digital display meter 9, the air outlet end of the electromagnetic valve V7 is connected with the air inlet end of the third gas mass flow controller 10, the air outlet end of the third gas mass flow controller 10 is connected with the air inlet ends of the electromagnetic valve V8 and the electromagnetic valve V9, and the air outlet end of the electromagnetic valve V9 is connected with the outside atmosphere and used for pressure discharge and air exhaust.
The gas pressure regulating injection system is used for providing test gas with different pressures for the test device, in order to guarantee pressure regulating precision, the system adopts a high pressure regulating valve 7 and a low pressure regulating valve 8 with different pressure regulating ranges, the high pressure regulating valve 7 is selected according to requirements during testing, the inlet pressure of the high pressure regulating valve 7 is less than 32MPa, the outlet pressure is 0-20 MPa and adjustable, the inlet pressure of the low pressure regulating valve 8 is less than 0.2MPa, and the outlet pressure is 0-0.1 MPa and adjustable. In order to control the testing air inflow, the flow control range of the gas mass flow controller is 0-5000 sccm, and the measurement precision is +/-1%.
The liquid pressure-regulating injection system comprises a liquid storage container 11, a precision injection pump 12, a first piston intermediate container 13 and a second piston intermediate container 14, wherein the liquid storage container 11 is connected with the inlet end of the precision injection pump 12 through a pipeline, and the outlet end of the precision injection pump 12 is respectively connected with the inlet ends of the first piston intermediate container 13 and the second piston intermediate container 14.
The precision injection pump 12 is used for adjusting and keeping constant liquid inlet pressure and liquid inlet flow, and the highest pressure is 20 MPa.
The gas pressure-regulating injection system and the liquid pressure-regulating injection system provide gas and liquid for the gas-liquid stirring device 15 so as to prepare gas-liquid saturated liquid according to test requirements.
The pressure measurement system comprises a gas-liquid stirring device 15, a low-pressure sensor 16, a high-pressure sensor 17, a solenoid valve V10 and a solenoid valve V11, wherein a gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15 is connected with inlet ends of a solenoid valve V10 and a solenoid valve V11, an outlet end of the solenoid valve V10 is connected with an inlet end of the low-pressure sensor 16, and an outlet end of the solenoid valve V11 is connected with an inlet end of the high-pressure sensor.
The low-pressure sensor 16 and the high-pressure sensor 17 adopt pressure sensors with the precision of 0.1 percent and are used for measuring the pressure of test media at the inlets of the uranium tailing filling device 19 and the rock and soil sample holding device 18, and the measuring range of the pressure transmitter of the high-pressure sensor 17 is 25 MPa; the measuring range of the low-pressure sensor 16 pressure transmitter is 1MPa, and the system precision and stability are ensured by adopting the pressure during testing according to the pressure.
The excitation system comprises a rock-soil sample adding device 18, a uranium tailing filling device 19, an excitation device 33, a ring pressure device 34, an electromagnetic valve V12, an electromagnetic valve V13, an electromagnetic valve V14 and an electromagnetic valve V15, wherein the rock-soil sample adding device 18 and the uranium tailing filling device 19 are arranged on the excitation device 33, the excitation device 33 can provide vibration with different frequencies, with the vibration environment that simulation test uranium tailings and ground are located, the ground sample adds holds 18 confining pressure ware inlet end solenoid valves of device and 19 confining pressure ware inlet end solenoid valves of uranium tailings packing device and is connected with ring pressure device 34 respectively, solenoid valve V12 exit end and 19 inlet end connections of uranium tailings packing device, solenoid valve V13 exit end and ground sample add and hold 18 inlet end connections of device, solenoid valve V14 entrance end and 19 outlet end connections of uranium tailings packing device, solenoid valve V15 entrance end and ground sample add and hold 18 outlet end connections.
The ring pressure device 34 consists of a manual pump and a ring pressure gauge, and is used for establishing the confining pressure of the rock-soil sample adding device 18 and the uranium tail sand filling device 19 and preventing the test medium from streaming around the rock-soil.
The back pressure system comprises a back pressure valve 20, a back pressure pump 21, a third real-time pressure collector digital display meter 22 and an electromagnetic valve V16, wherein the outlet end of the back pressure pump 21 is respectively connected with the inlet end of the third real-time pressure collector digital display meter 22 and the inlet end of the electromagnetic valve V16, and the outlet end of the electromagnetic valve V16 is connected with the second inlet end of the back pressure valve 20.
The back pressure system is used for providing reverse back pressure for the uranium tailings filling device 19 and the rock and soil sample holding device 18, the highest pressure provided is 20Mpa, and the control precision is 0.1 MPa.
The flow metering system comprises a gas-liquid separator 23, a dryer 24, a gas mass flowmeter 25, a first one-way valve 26, a gas collecting bag 27, a second one-way valve 28, a liquid storage container 29, a balance 30 with a data output function and a fourth digital display meter 31 of a real-time pressure collector, the outlet end of a fourth real-time pressure collector digital display meter 31 is connected with the inlet end of a gas-liquid separator 23, the gas outlet end of the gas-liquid separator 23 is connected with the inlet end of a dryer 24, the outlet end of the dryer 24 is connected with the inlet end of a gas mass flowmeter 25, the outlet end of the gas mass flowmeter 25 is connected with the inlet end of a first one-way valve 26, the outlet end of the first one-way valve 26 is connected with a gas collecting bag 27, the liquid outlet end of the gas-liquid separator 23 is connected with the inlet end of a second one-way valve 28, the outlet end of the second one-way valve 28 is connected with the inlet.
The gas mass flow meter 25 is used for measuring the gas flow of gas in a standard state, the working pressure of the gas mass flow meter is not more than 10MPa, and the test range is 0-300 sccm.
The data collector 32 comprises an AD converter, a signal conversion board, a computer data collection and peripheral circuit, a digital collection card, an industrial control computer, application software and gas-liquid phase metering software, the data collector 32 is used for collecting real-time data of pressure, flow and temperature and controlling signals of electrical elements, permeability calculation and curve drawing are carried out according to the obtained data, and the obtained result is automatically stored in the system.
The data acquisition unit 32 fluid permeability calculation satisfies the following formula:
Figure 553372DEST_PATH_IMAGE002
（1）
in formula (1): k1Denotes the liquid permeability, in units of 10-3μm2；μ1Represents the viscosity of the liquid in mpa · s; l represents the length of a sample loading cylinder of a rock and soil sample loading device 18 and the length of a sample loading cylinder of a uranium tailing filling device 19, and the unit is cm; q represents the liquid flow rate and is expressed in ml/s; a represents the cross-sectional area of the inner cavity of the 18 sample loading cylinder of the rock and soil sample loading device and the cross-sectional area of the inner cavity of the 19 sample loading cylinder of the uranium tailing loading device, and the unit is cm2(ii) a And delta P represents the pressure difference between two ends of the rock-soil sample adding device 18 and the uranium tailing filling device 19, and the unit is MPa.
The gas permeability calculation of the data collector 32 satisfies the following formula:
Figure 470512DEST_PATH_IMAGE004
（2）
in formula (2): q0Representing the gas flow rate under the atmospheric pressure, and the unit is ml/min; p0Representing atmospheric pressure in Kpa; mu.s2Represents the gas viscosity in mpa · s; p1The inlet pressure of the rock-soil sample adding device 18 and the inlet pressure of the uranium tailing filling device 19 are represented, and the unit is Kpa; k2Denotes gas permeability, in units of 10-3μm2。
Flow rate Q measured by the gas mass flow meter 251Is the gas flow under 1 standard atmospheric pressure, and is corrected during measurement, and the correction satisfies the following formula,
Figure 187932DEST_PATH_IMAGE006
（3）
in formula (3): t represents the ambient temperature at the time of the test.
The device comprises a first piston intermediate container 13, a second piston intermediate container 14, a gas-liquid stirring device 15, a low-pressure sensor 16, a high-pressure sensor 17, a rock-soil sample adding device 18, a uranium tailing filling device 19, an excitation device 33, an electromagnetic valve V10, an electromagnetic valve V11, an electromagnetic valve V12, an electromagnetic valve V13, an electromagnetic valve V14 and an electromagnetic valve V15, wherein the constant temperature box 35 is arranged in a constant temperature box 35, the temperature regulation and control of a solid-liquid-gas three-phase test medium are realized by heating or refrigeration, the current temperature is fed back through a detection element, the temperature is automatically controlled, and the test is ensured to be carried out under the required temperature condition.
The connection relationship of the above systems is as follows:
the outlet end of the electromagnetic valve V8 is connected with the gas inlet end of the gas-liquid stirring device 15, the outlet end of the precision injection pump 12 is connected with the electromagnetic valve at the liquid inlet end of the gas-liquid stirring device 15, the outlet ends of the first piston intermediate container 13 and the second piston intermediate container 14 are connected with the electromagnetic valve at the gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15, the inlet ends of the electromagnetic valve V12 and the electromagnetic valve V13, the outlet ends of the electromagnetic valve V14 and the electromagnetic valve V15 are respectively connected with the first inlet end of the backpressure valve 20, and the outlet end of the backpressure valve 20 is connected with the inlet.
A signal end a1 of the data collector 32 is connected with a signal end of the gas mass flowmeter 25 through a signal line, a2 is connected with a signal end of a fourth pressure real-time collector digital display meter 31 through a signal line, a3 is connected with a signal end of the excitation device 33 through a signal line, a4 is connected with a signal end of the ring pressure device 34 through a signal line, a5 is connected with a signal end of the high pressure sensor 17 through a signal line, a6 is connected with a signal end of the low pressure sensor 16 through a signal line, a7 is connected with a signal end of a third pressure real-time collector digital display meter 22 through a signal line, a8 is connected with a signal end of a third gas mass flow controller 10 through a signal line, a9 is connected with a signal end of a second pressure real-time collector digital display meter 9 through a signal line, a10 is connected with a signal end of a first pressure real-time collector digital display meter 6 through a signal line, a11 is connected with a, a12 is connected with the signal end of the precision injection pump 12 through a signal wire, a13 is connected with the signal end of the first gas mass flow controller 4 through a signal wire, a14 is connected with the signal end of the incubator 35 through a signal wire, and a15 is connected with the signal end of the balance 30 with the data output function through a signal wire.
The booster pump 3, the high pressure regulating valve 7, the low pressure regulating valve 8, the back pressure pump 21 and the electromagnetic valves in the testing device are respectively connected with the data acquisition unit 32 through electric control lines, and the opening and closing of the data acquisition unit 32 are controlled.
The second embodiment is a method for testing the permeability of uranium tailings and a lower lying rock-soil layer by adopting a uranium tailings warehouse uranium tailings and lower lying rock-soil layer permeability testing device, the second embodiment adopts gas-liquid mixing to measure the permeability of the lower lying rock-soil layer and the permeability of the uranium tailings, and the method comprises the following specific steps:
A. preparation before testing
A1, taking the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 off the excitation device 33 in the testing device, filling the obtained lower horizontal rock-soil layer samples with standard sizes into the rock-soil sample adding and holding device 18, filling uranium tailings into the uranium tailing filling device 19 in a layering mode, compacting the uranium tailings to the in-situ uranium tailing body density value, and reinstalling the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 onto the excitation device 33 after filling is finished;
a2, starting the data acquisition unit 32, closing all electromagnetic valves under the control of the data acquisition unit 32, checking the air tightness of the pipeline, inputting the length of the sample loading cylinder of the rock-soil sample adding device 18 and the length of the sample loading cylinder of the uranium tailing filling device 19 into the data acquisition unit 32, and simulating the temperature environment where the uranium tailing and the rock-soil are located according to the test requirements to set the temperature of the constant temperature box 35.
B. Preparing gas-liquid saturated liquid required by test
B1, opening the precision injection pump 12, the solenoid valve at the inlet end of the first piston intermediate container 13 and the solenoid valve at the inlet end of the second piston intermediate container 14, the test liquid is injected from the liquid storage tank 11 into the first piston intermediate tank 13 and the second piston intermediate tank 14 at a constant flow rate and a constant pressure for the test liquid injection set in the data collector 32, and after the first piston intermediate tank 13 and the second piston intermediate tank 14 are filled with the liquid to be tested, opening an outlet end electromagnetic valve of the first piston intermediate container 13, an outlet end electromagnetic valve of the second piston intermediate container 14, an electromagnetic valve V12 and an electromagnetic valve V13, injecting the test liquid into the rock-soil sample adding device 18 and the uranium tailing filling device 19, after the test liquid is saturated, closing the solenoid valve V12, the solenoid valve V13, the solenoid valve at the inlet end of the first piston intermediate container 13 and the solenoid valve at the inlet end of the second piston intermediate container 14;
b2, opening the electromagnetic valve V1, the electromagnetic valve V2 and the booster pump 3 to input carbon dioxide and nitrogen, the air inflow is adjusted through the first gas mass flow controller 4 and the second gas mass flow controller 5, the proportion of carbon dioxide and nitrogen in the mixed gas is adjusted according to the test requirement, then the electromagnetic valve V3 is opened, the injected mixed gas is subjected to the first pressure regulation through the high-pressure regulating valve 7, the first pressure real-time collector digital display meter 6 feeds the gas pressure value back to the data collector 32, if the gas pressure value required by the test is reached, the electromagnetic valve V6 is opened, if the first pressure regulation does not reach the gas pressure value required by the test, the electromagnetic valves V4 and V5 are opened, the second pressure real-time collector digital display meter 9 feeds the gas pressure value back to the data collector 3, the injected mixed gas is subjected to secondary pressure regulation through a low-pressure regulating valve 8 so as to reach a gas pressure value required during testing;
b3, opening an electromagnetic valve at the liquid inlet end of the gas-liquid stirring device 15, injecting test liquid into the gas-liquid stirring device 15 from the liquid storage container 11, opening an electromagnetic valve V7 and an electromagnetic valve V8 to inject mixed gas after the gas-liquid stirring device 15 is filled with the liquid to be tested, feeding the gas into a data acquisition unit 32 by a third gas mass flow controller 10, controlling the gas inflow through the data acquisition unit 32, and then opening the gas-liquid stirring device 15Device for placingAnd 15, setting a speed regulating switch, and stirring to obtain gas-liquid saturated liquid required by the test.
C. Testing gas-liquid permeability of lower lying rock-soil layer sample
C1, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15, an electromagnetic valve V13 and an electromagnetic valve V15, injecting the gas-liquid saturated liquid into the rock-soil sample holding device 18, starting the excitation device 33 after the gas-liquid saturated liquid enters the rock-soil sample holding device 18, and simulating the vibration environment of the rock-soil according to test requirements;
c2, opening an electromagnetic valve at the inlet end of a confining pressure device of the rock and soil sample holding device 18, inputting pressure to the rock and soil sample holding device 18 through a ring pressure device 34, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after the pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches the backpressure set by a data collector 32, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector digital display table 22, then opening an electromagnetic valve V11, firstly testing the gas and liquid pressure value at the inlet end of the rock and soil sample holding device 18 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the gas and liquid pressure value at the inlet end of the rock, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the gas-liquid pressure value at the inlet end of the rock-soil sample holding device 18;
c3, when the gas-liquid pressure value at the inlet end of the rock-soil sample holding device 18 reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator 23, the first check valve 26 and the second check valve 28, injecting the gas-liquid saturated liquid into the gas-liquid separator 23, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator 23, discharging the gas from the gas outlet end of the gas-liquid separator 23, allowing the gas to enter the gas collection bag 27 through the dryer 24, the gas mass flow meter 25 and the first check valve 26, discharging the liquid from the liquid outlet end of the gas-liquid separator 23, allowing the liquid to enter the liquid storage container 29 through the second check valve 28, and metering the liquid in the liquid storage container 29 by the;
c4 and a data collector 32 collect gas flow through the gas mass flowmeter 25, collect liquid flow through the data output function balance 30, and automatically store and process data, thereby obtaining gas-liquid permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas-liquid flow.
D. Test of gas-liquid permeability of uranium tailings
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample adding device 18, and removing gas and liquid in the flow metering system;
d2, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15, an electromagnetic valve V12 and an electromagnetic valve V14, injecting gas-liquid saturated liquid into the uranium tailing filling device 19, starting the excitation device 33 after the gas-liquid saturated liquid enters the uranium tailing filling device 19, and simulating a vibration environment where uranium tailing is located according to test requirements;
d3, opening an inlet end electromagnetic valve of a confining pressure device of a uranium tailing filling device 19, inputting pressure to the uranium tailing filling device 19 through a ring pressure device 34, establishing confining pressure around a test sample, preventing a test medium from streaming around the uranium tailing, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after a pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches the backpressure set by a data collector 32, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector digital display table 22, then opening an electromagnetic valve V11, firstly testing the inlet end pressure value of the uranium tailing filling device 19 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, and testing the inlet end gas-liquid pressure value of the uranium tailing filling device 19 by using a low-pressure sensor 16, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the gas-liquid pressure value at the inlet end of the uranium tailings filling device 19;
d4, after the gas-liquid pressure value at the inlet end of the uranium tailings filling device 19 reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator 23, the first check valve 26 and the second check valve 28, injecting the gas-liquid saturated liquid into the gas-liquid separator 23, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator 23, discharging the gas from the gas outlet end of the gas-liquid separator 23, allowing the gas to enter the gas collection bag 27 through the dryer 24, the gas mass flow meter 25 and the first check valve 26, discharging the liquid from the liquid outlet end of the gas-liquid separator 23, allowing the liquid to enter the liquid storage container 29 through the second check valve 28, and metering the liquid in the liquid storage container 29 by the balance;
d5 and the data collector 32 collect gas flow through the gas mass flowmeter 25, collect liquid flow through the data output function balance 30, and automatically store and process data, thereby obtaining gas-liquid permeability of uranium tailings samples under the conditions of different temperatures, different pressures and different gas-liquid flow.
In the third embodiment, a uranium tailing pond uranium tailing and lower lying rock-soil layer permeability testing device is adopted to test uranium tailing and lower lying rock-soil layer permeability, a single mixed gas is adopted to measure lower lying rock-soil layer permeability and uranium tailing permeability, and the specific steps are as follows:
A. preparation before testing
A1, taking the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 off the excitation device 33 in the testing device, filling the obtained lower horizontal rock-soil layer samples with standard sizes into the rock-soil sample adding and holding device 18, filling uranium tailings into the uranium tailing filling device 19 in a layering mode, compacting the uranium tailings to the in-situ uranium tailing body density value, and reinstalling the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 onto the excitation device 33 after filling is finished;
a2, starting the data acquisition unit 32, closing all electromagnetic valves under the control of the data acquisition unit 32, checking the air tightness of the pipeline, inputting the length of the sample loading cylinder of the rock-soil sample adding device 18 and the length of the sample loading cylinder of the uranium tailing filling device 19 into the data acquisition unit 32, and simulating the temperature environment where the uranium tailing and the rock-soil are located according to the test requirements to set the temperature of the constant temperature box 35.
B. Preparation of the Mixed gas required for the test
Opening the electromagnetic valve V1, the electromagnetic valve V2 and the booster pump 3 to input carbon dioxide and nitrogen, adjusting the air input through the first gas mass flow controller 4 and the second gas mass flow controller 5, adjusting the proportion of the carbon dioxide and the nitrogen in the mixed gas according to the test requirement, then the electromagnetic valve V3 is opened, the injected mixed gas is subjected to the first pressure regulation through the high-pressure regulating valve 7, the first pressure real-time collector digital display meter 6 feeds the gas pressure value back to the data collector 32, if the gas pressure value required by the test is reached, the electromagnetic valve V6 is opened, if the first pressure regulation does not reach the gas pressure value required by the test, the electromagnetic valves V4 and V5 are opened, the second pressure real-time collector digital display meter 9 feeds the gas pressure value back to the data collector 3, and the injected mixed gas is subjected to secondary pressure regulation through the low-pressure regulating valve 8 so as to reach the gas pressure value required during testing.
C. The data collector 32, to which the third gas mass flow controller 10 feeds back the intake air amount, controls the intake air amount by the data collector 32 by opening the solenoid valve V7 and the solenoid valve V8 and injecting the mixture gas into the gas-liquid stirring apparatus 15.
D. Testing gas permeability of lower lying rock-soil layer sample
D1, after the gas-liquid stirring device 15 is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15, a solenoid valve V13 and a solenoid valve V15, injecting the mixed gas into the rock-soil sample holding device 18, starting the excitation device 33 after the mixed gas enters the rock-soil sample holding device 18, and simulating the vibration environment of the rock-soil according to the test requirements;
d2, opening an electromagnetic valve at the inlet end of a confining pressure device of the rock and soil sample holding device 18, inputting pressure to the rock and soil sample holding device 18 through a ring pressure device 34, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after the pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches the backpressure set by a data collector 32, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector digital display table 22, then opening an electromagnetic valve V11, firstly testing the pressure value of the gas at the inlet end of the rock and soil sample holding device 18 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the pressure value of the gas at the inlet end of the rock, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the pressure value of the gas at the inlet end of the rock-soil sample holding device 18;
d3, when the pressure value of the gas at the inlet end of the rock and soil sample holding device 18 reaches the pressure required by the test, opening the gas inlet end valve of the gas-liquid separator 23 and the first one-way valve 26, injecting the mixed gas into the gas-liquid separator 23, discharging the mixed gas from the gas outlet end of the gas-liquid separator 23, and allowing the mixed gas to enter the gas collecting bag 27 through the dryer 24, the gas mass flowmeter 25 and the first one-way valve 26;
d4 and the data collector 32 collect the gas flow through the gas mass flowmeter 25 and automatically store and process the data, thereby obtaining the gas permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas flows.
E. Testing gas permeability of uranium tailings
E1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample adding device 18, and removing gas of the flow metering system;
e2, after the gas-liquid stirring device 15 is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device 15, a solenoid valve V12 and a solenoid valve V14, injecting the mixed gas into the uranium tailing filling device 19, starting the excitation device 33 after the mixed gas enters the uranium tailing filling device 19, and simulating the vibration environment of rock and soil according to the test requirements;
e3, opening an electromagnetic valve at the inlet end of a confining pressure device of a uranium tailing filling device 19, inputting pressure to the uranium tailing filling device 19 through a ring pressure device 34, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after a pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches backpressure set by a data collector 32, applying reverse digital display backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector table 22, then opening an electromagnetic valve V11, firstly testing the gas pressure value at the inlet end of the uranium tailing filling device 19 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the gas pressure value at the inlet end of the uranium tailing filling device 19 by using the low-, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the gas pressure value at the inlet end of the uranium tailings filling device 19;
e4, when the pressure value of the gas at the inlet end of the uranium tailings filling device 19 reaches the pressure required by the test, opening the gas inlet end valve of the gas-liquid separator 23 and the first one-way valve 26, injecting the mixed gas into the gas-liquid separator 23, discharging the mixed gas from the gas outlet end of the gas-liquid separator 23, and allowing the mixed gas to enter the gas collecting bag 27 through the dryer 24, the gas mass flowmeter 25 and the first one-way valve 26;
e5 and the data collector 32 collect the gas flow through the gas mass flowmeter 25 and automatically store and process the data, thereby obtaining the gas permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas flows.
The fourth embodiment adopts a uranium tailings pond uranium tailings and a lower lying rock-soil layer permeability testing device to test uranium tailings and permeability of the lower lying rock-soil layer, and the fourth embodiment adopts a single liquid to measure permeability of the lower lying rock-soil layer and permeability of the uranium tailings, and comprises the following specific steps:
A. preparation before testing
A1, taking the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 off the excitation device 33 in the testing device, filling the obtained lower horizontal rock-soil layer samples with standard sizes into the rock-soil sample adding and holding device 18, filling uranium tailings into the uranium tailing filling device 19 in a layering mode, compacting the uranium tailings to the in-situ uranium tailing body density value, and reinstalling the rock-soil sample adding and holding device 18 and the uranium tailing filling device 19 onto the excitation device 33 after filling is finished;
a2, starting the data acquisition unit 32, closing all electromagnetic valves under the control of the data acquisition unit 32, checking the air tightness of the pipeline, inputting the length of the sample loading cylinder of the rock-soil sample adding device 18 and the length of the sample loading cylinder of the uranium tailing filling device 19 into the data acquisition unit 32, and simulating the temperature environment where the uranium tailing and the rock-soil are located according to the test requirements to set the temperature of the constant temperature box 35.
B. The precision injection pump 12, the solenoid valve at the inlet end of the first piston intermediate container 13 and the solenoid valve at the inlet end of the second piston intermediate container 14 are opened, the test liquid is injected from the liquid storage tank 11 into the first piston intermediate tank 13 and the second piston intermediate tank 14 at a constant flow rate and a constant pressure for the test liquid injection set in the data collector 32, and after the first piston intermediate tank 13 and the second piston intermediate tank 14 are filled with the liquid to be tested, opening an outlet end electromagnetic valve of the first piston intermediate container 13, an outlet end electromagnetic valve of the second piston intermediate container 14, an electromagnetic valve V12 and an electromagnetic valve V13, injecting the test liquid into the rock-soil sample adding device 18 and the uranium tailing filling device 19, after the test liquid is saturated, closing solenoid valve V12, solenoid valve V13, the solenoid valve at the inlet end of first piston intermediate reservoir 13 and the solenoid valve at the inlet end of second piston intermediate reservoir 14.
C. Testing liquid permeability of lower lying rock-soil layer sample
C1, opening an electromagnetic valve at the inlet end of the first piston intermediate container 13, an electromagnetic valve at the inlet end of the second piston intermediate container 14, an electromagnetic valve V13 and an electromagnetic valve V15, and injecting liquid into the rock and soil sample holding device 18;
c2, opening an electromagnetic valve at the inlet end of a confining pressure device of the rock and soil sample holding device 18, inputting pressure to the rock and soil sample holding device 18 through a ring pressure device 34, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after the pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches the backpressure set by a data collector 32, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector digital display table 22, then opening an electromagnetic valve V11, firstly testing the liquid pressure value at the inlet end of the rock and soil sample holding device 18 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the liquid pressure value at the inlet end of the rock and soil sample holding, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the liquid pressure value at the inlet end of the rock-soil sample holding device 18;
c3, when the pressure value of the liquid at the inlet end of the rock and soil sample holding device 18 reaches the pressure required by the test, opening the air inlet end valve of the gas-liquid separator 23 and the second one-way valve 28, injecting the liquid into the gas-liquid separator 23, discharging the liquid from the liquid outlet end of the gas-liquid separator 23, allowing the liquid to enter the liquid storage container 29 through the second one-way valve 28, and metering the liquid in the liquid storage container 29 by the balance 30 with the data output function;
c4 and the data collector 32 collect liquid flow through the data output function balance 30, and automatically store and process data, so that the liquid permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas-liquid flow rates is obtained.
D. Testing of uranium tailings liquid permeability
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample adding device 18, and discharging liquid of the flow metering system;
d2, opening an electromagnetic valve at the inlet end of the first piston intermediate container 13, an electromagnetic valve at the inlet end of the second piston intermediate container 14, an electromagnetic valve V12 and an electromagnetic valve V14, and injecting liquid into the uranium tailings filling device 19;
d3, opening an electromagnetic valve at the inlet end of a confining pressure device of a uranium tailing filling device 19, inputting pressure to the uranium tailing filling device 19 through a ring pressure device 34, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve 20 and a backpressure pump 21 after a pressure value fed back by a fourth pressure real-time collector digital display table 31 reaches backpressure set by a data collector 32, applying reverse digital display backpressure to the test sample, feeding back the reverse backpressure value to the data collector 32 by a third pressure real-time collector table 22, then opening an electromagnetic valve V11, firstly testing the liquid pressure value at the inlet end of the uranium tailing filling device 19 by using a high-pressure sensor 17, if the test pressure value is within the range of a low-pressure sensor 16, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the liquid pressure value at the inlet end of the uranium tailing filling device 19 by using the low-, if the test pressure value exceeds the range of the low-pressure sensor 16 and is within the range of the high-pressure sensor 17, the high-pressure sensor 17 is still used for testing the liquid pressure value at the inlet end of the uranium tailings filling device 19;
d4, when the pressure value of liquid at the inlet end of the uranium tailings filling device 19 reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator 23 and the second one-way valve 28, injecting the liquid into the gas-liquid separator 23, discharging the liquid from the liquid outlet end of the gas-liquid separator 23, allowing the liquid to enter the liquid storage container 29 through the second one-way valve 28, and metering the liquid in the liquid storage container 29 by the balance 30 with the data output function;
d5 and the data collector 32 collect liquid flow through the data output function balance 30, and automatically store and process data, thereby obtaining liquid permeability of uranium tailings samples under the conditions of different temperatures, different pressures and different gas-liquid flow rates.

Claims (6)

1. Uranium tailings of uranium tailings storehouse and rock-soil layer permeability testing arrangement that crouches down, characterized by: the device comprises a gas pressure-regulating injection system, a liquid pressure-regulating injection system, a pressure measurement system, an excitation system, a back pressure system, a flow metering system, a data acquisition unit and a thermostat;
the gas pressure-regulating injection system comprises a carbon dioxide gas storage tank, a nitrogen gas storage tank, a booster pump, a first gas mass flow controller, a second gas mass flow controller, a third gas mass flow controller, a first pressure real-time collector digital display meter, a second pressure real-time collector digital display meter, a high-pressure regulating valve, a low-pressure regulating valve and electromagnetic valves V1-V9;
the carbon dioxide gas storage tank is connected with the gas inlet end of the first gas mass flow controller through an electromagnetic valve V1, the nitrogen gas storage tank is connected with the gas inlet end of the second gas mass flow controller through an electromagnetic valve V2, the booster pump is respectively connected with the gas inlet end of the first gas mass flow controller and the gas inlet end of the second gas mass flow controller, the gas outlet end of the first gas mass flow controller and the gas outlet end of the second gas mass flow controller are connected with the gas inlet end of an electromagnetic valve V3, the gas outlet end of an electromagnetic valve V3 is connected with the gas inlet end of a high-pressure regulating valve, the gas outlet end of the high-pressure regulating valve is respectively connected with the gas inlet ends of an electromagnetic valve V4, an electromagnetic valve V6 and a first pressure real-time collector digital display meter, the gas outlet end of an electromagnetic valve V4 is connected with the gas inlet end of a low-pressure regulating valve, the gas outlet end of the low-pressure regulating valve is connected with the gas inlet end of an electromagnetic valve V, the air outlet end of the electromagnetic valve V7 is connected with the air inlet end of a third gas mass flow controller, the air outlet end of the third gas mass flow controller is connected with the air inlet ends of an electromagnetic valve V8 and an electromagnetic valve V9, and the air outlet end of an electromagnetic valve V9 is connected with the outside atmosphere and used for pressure discharge and air exhaust;
the liquid pressure-regulating injection system comprises a liquid storage container, a precision injection pump, a first piston intermediate container and a second piston intermediate container, wherein the liquid storage container is connected with the inlet end of the precision injection pump through a pipeline, and the outlet end of the precision injection pump is respectively connected with the inlet ends of the first piston intermediate container and the second piston intermediate container;
the pressure measurement system comprises a gas-liquid stirring device, a low-pressure sensor, a high-pressure sensor, a solenoid valve V10 and a solenoid valve V11, wherein a gas-liquid saturated liquid outlet end of the gas-liquid stirring device is connected with inlet ends of a solenoid valve V10 and a solenoid valve V11, an outlet end of the solenoid valve V10 is connected with an inlet end of the low-pressure sensor, and an outlet end of the solenoid valve V11 is connected with an inlet end of the high-pressure;
the excitation system comprises a rock-soil sample adding and holding device, a uranium tailing filling device, an excitation device, a ring pressing device, a solenoid valve V12, a solenoid valve V13, a solenoid valve V14 and a solenoid valve V15, wherein the rock-soil sample adding and holding device and the uranium tailing filling device are installed on the excitation device, the excitation device can provide vibration with different frequencies to simulate and test the vibration environment of uranium tailings and rock-soil, the solenoid valve at the inlet end of the rock-soil sample adding and holding device and the solenoid valve at the inlet end of the uranium tailing filling device are respectively connected with the ring pressing device, the outlet end of a solenoid valve V12 is connected with the inlet end of the uranium tailing filling device, the outlet end of a solenoid valve V13 is connected with the inlet end of the rock-soil sample adding and holding device, the inlet end of a solenoid valve V14 is connected with the outlet end of the uranium tailing filling device, and the inlet end of;
the back pressure system comprises a back pressure valve, a back pressure pump, a third pressure real-time collector digital display meter and an electromagnetic valve V16, wherein the outlet end of the back pressure pump is respectively connected with the inlet end of the third pressure real-time collector digital display meter and the inlet end of the electromagnetic valve V16, and the outlet end of the electromagnetic valve V16 is connected with the second inlet end of the back pressure valve;
the flow metering system comprises a gas-liquid separator, a dryer, a gas mass flowmeter, a first one-way valve, a gas collecting bag, a second one-way valve, a liquid storage container, a balance with a data output function and a fourth digital display meter of a real-time pressure collector, wherein the outlet end of the fourth digital display meter of the real-time pressure collector is connected with the inlet end of the gas-liquid separator;
the device comprises a first piston intermediate container, a second piston intermediate container, a gas-liquid stirring device, a low-pressure sensor, a high-pressure sensor, a rock-soil sample adding device, a uranium tailing filling device, an excitation device, an electromagnetic valve V10, an electromagnetic valve V11, an electromagnetic valve V12, an electromagnetic valve V13, an electromagnetic valve V14 and an electromagnetic valve V15, wherein the constant temperature box is arranged in a constant temperature box, realizes temperature regulation and control of a solid-liquid-gas three-phase test medium by heating or refrigeration, and automatically controls the temperature by feeding back the current temperature through a detection element to ensure that the test is carried out under the required temperature condition;
the connection relationship of the above systems is as follows:
the outlet end of the electromagnetic valve V8 is connected with the gas inlet end of the gas-liquid stirring device, the outlet end of the precision injection pump is connected with the electromagnetic valve at the liquid inlet end of the gas-liquid stirring device, the outlet ends of the first piston intermediate container and the second piston intermediate container are connected with the electromagnetic valve at the gas-liquid saturated liquid outlet end of the gas-liquid stirring device, the inlet ends of the electromagnetic valve V12 and the electromagnetic valve V13, the outlet ends of the electromagnetic valve V14 and the electromagnetic valve V15 are respectively connected with the first inlet end of the backpressure valve, and the outlet end of the backpressure valve is connected with the;
a signal end a1 of a data collector is connected with a signal end of a gas mass flowmeter through a signal line, a2 is connected with a signal end of a fourth pressure real-time collector digital display meter through a signal line, a3 is connected with a signal end of a vibration excitation device through a signal line, a4 is connected with a signal end of a ring pressure device through a signal line, a5 is connected with a signal end of a high-pressure sensor through a signal line, a6 is connected with a signal end of a low-pressure sensor through a signal line, a7 is connected with a signal end of a third pressure real-time collector digital display meter through a signal line, a8 is connected with a signal end of a third gas mass flow controller through a signal line, a9 is connected with a signal end of a second pressure real-time collector digital display meter through a signal line, a10 is connected with a signal end of a first pressure real-time collector digital display meter through a signal line, a11 is connected with a signal end of a second gas mass flow controller through, a13 is connected with the signal end of the first gas mass flow controller through a signal wire, a14 is connected with the signal end of the incubator through a signal wire, and a15 is connected with the signal end of the balance with the data output function through a signal wire;
the booster pump, the high-pressure regulating valve, the low-pressure regulating valve, the backpressure pump and the electromagnetic valve in the testing device are respectively connected with the data acquisition unit through electric control lines, and the opening and closing of the data acquisition unit are controlled by the data acquisition unit.
2. The uranium tailings and the permeability testing device for the lower lying rock-soil layer in the uranium tailing pond according to claim 1, wherein the permeability testing device comprises: the data acquisition unit comprises an AD converter, a signal conversion board, a computer data acquisition and peripheral circuit, a digital acquisition card, an industrial control computer, application software and gas-liquid phase metering software, and is used for acquiring real-time data of pressure, flow and temperature and controlling signals of electrical elements, carrying out permeability calculation and curve drawing according to the obtained data, and automatically storing the obtained result in the system;
the calculation of the liquid permeability of the data acquisition unit meets the following formula:
Figure DEST_PATH_IMAGE002
（1）
in formula (1): k1Denotes the liquid permeability, in units of 10-3μm2；μ1Represents the viscosity of the liquid in mpa · s; l represents the length of a sample loading cylinder of the rock and soil sample loading device and the length of a sample loading cylinder of the uranium tailing loading device, and the unit is cm; q represents the liquid flow rate and is expressed in ml/s; a represents the cross-sectional area of the inner cavity of the sample loading cylinder of the rock and soil sample loading device and the cross-sectional area of the inner cavity of the sample loading cylinder of the uranium tailing loading device, and the unit is cm2(ii) a The delta P represents the pressure difference between two ends of the rock-soil sample feeding device and the uranium tailing filling device, and the unit is MPa;
the gas permeability calculation of the data acquisition unit meets the following formula:
Figure DEST_PATH_IMAGE004
（2）
in formula (2): q0Representing the gas flow rate under the atmospheric pressure, and the unit is ml/min; p0Representing atmospheric pressure in Kpa; mu.s2Represents the gas viscosity in mpa · s; p1Representing the inlet pressure of a rock-soil sample filling device and a uranium tailings filling device, wherein the unit is Kpa; k2Denotes gas permeability, in units of 10-3μm2；
Flow rate Q measured by gas mass flowmeter1Is the gas flow under 1 standard atmospheric pressure, and is corrected during measurement, and the correction satisfies the following formula,
Figure DEST_PATH_IMAGE006
（3）
in formula (3): t represents the ambient temperature at the time of the test.
3. The uranium tailings and the permeability testing device for the lower lying rock-soil layer of the uranium tailings pond of claim 1 or 2, wherein: the gas pressure regulating injection system is used for providing test gases with different pressures for the test device, and in order to ensure pressure regulating precision, the system adopts a high pressure regulating valve and a low pressure regulating valve with different pressure regulating ranges, the high pressure regulating valve and the low pressure regulating valve are selected according to requirements during testing, the inlet pressure of the high pressure regulating valve is less than 32MPa, the outlet pressure of the high pressure regulating valve is 0-20 MPa and is adjustable, the inlet pressure of the low pressure regulating valve is less than 0.2MPa, the outlet pressure of the high pressure regulating valve is 0-0.1 MPa and is adjustable, in order to control test air inflow, the flow control range of a gas mass flow;
the precision injection pump is used for adjusting and keeping constant liquid inlet pressure and liquid inlet flow, and the highest pressure is 20 MPa;
the low-pressure sensor and the high-pressure sensor adopt pressure sensors with the precision of 0.1 percent and are used for measuring the pressure of test media at the inlets of the uranium tailing filling device and the rock and soil sample holding device, and the measuring range of the pressure transmitter of the high-pressure sensor is 25 MPa; the measuring range of the low-pressure sensor pressure transmitter is 1MPa, and the system precision and stability are ensured by adopting the pressure during testing according to the pressure;
the ring pressure device consists of a manual pump and a ring pressure gauge, is used for establishing confining pressure of the rock-soil sample loading device and the uranium tailing loading device, and prevents test media from streaming around the rock-soil;
the back pressure system is used for providing reverse back pressure for the uranium tailing filling device and the rock and soil sample holding device, the highest pressure is 20MPa, and the control precision is 0.1 MPa;
the gas mass flow meter is used for measuring the gas flow of gas in a standard state, the working pressure of the gas mass flow meter is not more than 10MPa, and the test range is 0-300 sccm.
4. The method for testing the permeability of the lower lying rock-soil layer and the permeability of uranium tailings by adopting the testing device as claimed in claim 3, is characterized in that: the method adopts gas-liquid mixing to measure the permeability of the lower lying rock-soil layer and the permeability of uranium tailings, and comprises the following specific steps:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data collector, controlling to close all electromagnetic valves through the data collector, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data collector, and simulating the temperature environment where uranium tailing and rock soil are located according to test requirements to set the temperature of a constant temperature box;
B. preparing gas-liquid saturated liquid required by test
B1, opening the precision injection pump, the first piston intermediate container inlet electromagnetic valve and the second piston intermediate container inlet electromagnetic valve, injecting the test liquid from the liquid storage container into the first piston intermediate container and the second piston intermediate container according to the preset constant flow rate and constant pressure of the test liquid injection in the data acquisition unit, after the first piston intermediate container and the second piston intermediate container are filled with the liquid to be tested, opening the first piston intermediate container outlet electromagnetic valve, the second piston intermediate container outlet electromagnetic valve, the electromagnetic valves V12 and V13, injecting the test liquid into the rock and soil sample holding device and the uranium tailings filling device, and after the test liquid is saturated, closing the electromagnetic valves V12, V13, the first piston intermediate container inlet electromagnetic valve and the second piston intermediate container inlet electromagnetic valve;
b2, opening the electromagnetic valve V1, the electromagnetic valve V2 and the booster pump to input carbon dioxide and nitrogen, adjusting the air input through the first gas mass flow controller and the second gas mass flow controller, adjusting the proportion of the carbon dioxide and the nitrogen in the mixed gas according to the test requirement, then the electromagnetic valve V3 is opened, the mixed gas injected is regulated for the first time through the high-pressure regulating valve, the first pressure real-time collector digital display meter feeds back the gas pressure value to the data collector, if the gas pressure value required by the test is reached, opening the electromagnetic valve V6, if the first pressure regulation does not reach the gas pressure value required by the test, opening the electromagnetic valves V4 and V5, feeding the gas pressure value back to the data collector by the second pressure real-time collector digital display meter, carrying out secondary pressure regulation on the injected mixed gas through a low-pressure regulating valve so as to achieve a gas pressure value required during testing;
b3, opening an electromagnetic valve at the liquid inlet end of the gas-liquid stirring device, injecting test liquid into the gas-liquid stirring device from a liquid storage container, opening an electromagnetic valve V7 and an electromagnetic valve V8 to inject mixed gas after the gas-liquid stirring device is filled with the liquid to be tested, feeding the gas inflow back to a data acquisition unit by a third gas mass flow controller, controlling the gas inflow through the data acquisition unit, then opening a speed regulating switch of the gas-liquid stirring device, setting the stirring speed, and obtaining gas-liquid saturated liquid required by the test after stirring;
C. testing gas-liquid permeability of lower lying rock-soil layer sample
C1, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, an electromagnetic valve V13 and an electromagnetic valve V15, injecting gas-liquid saturated liquid into the rock-soil sample adding and holding device, starting the excitation device after the gas-liquid saturated liquid enters the rock-soil sample adding and holding device, and simulating the vibration environment of rock-soil according to test requirements;
c2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end gas-liquid pressure value of the rock and soil sample confining device by adopting a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end gas-liquid pressure value of the rock and soil sample confining device by adopting the low pressure sensor, if the, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas-liquid pressure value at the inlet end of the rock-soil sample holding device;
c3, when the gas-liquid pressure value at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening a gas-liquid separator gas inlet end valve, a first one-way valve and a second one-way valve, injecting gas-liquid saturated liquid into the gas-liquid separator, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator, discharging gas from the gas outlet end of the gas-liquid separator, entering a gas collection bag through a dryer, a gas mass flowmeter and the first one-way valve, discharging liquid from the liquid outlet end of the gas-liquid separator, entering a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by a balance with a data output function;
c4, collecting gas flow by a gas mass flowmeter, collecting liquid flow by a data output function balance, and automatically storing and processing data to obtain gas-liquid permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas-liquid flow;
D. test of gas-liquid permeability of uranium tailings
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and removing gas and liquid in the flow metering system;
d2, opening an electromagnetic valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, an electromagnetic valve V12 and an electromagnetic valve V14, injecting gas-liquid saturated liquid into the uranium tailing filling device, starting an excitation device after the gas-liquid saturated liquid enters the uranium tailing filling device, and simulating a vibration environment where uranium tailing is located according to test requirements;
d3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around the uranium tailing, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the gas-liquid pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the gas-liquid pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, in the range of the high-pressure sensor, the gas-liquid pressure value at the inlet end of the uranium tailings filling device is still tested by the high-pressure sensor;
d4, when the gas-liquid pressure value at the inlet end of the uranium tailing filling device reaches the pressure required by the test, opening a gas-liquid separator gas inlet end valve, a first one-way valve and a second one-way valve, injecting gas-liquid saturated liquid into the gas-liquid separator, carrying out gas-liquid separation on the gas-liquid saturated liquid by the gas-liquid separator, discharging gas from the gas outlet end of the gas-liquid separator, entering a gas collecting bag through a dryer, a gas mass flowmeter and the first one-way valve, discharging liquid from the liquid outlet end of the gas-liquid separator, entering a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by a balance with a data output function;
d5, data acquisition unit pass through gas mass flow meter collection gas flow, gather the liquid flow through data output function balance to automatic save and handle data, thereby obtain the gas-liquid permeability of uranium tailings sample under different temperature, different pressure, different gas-liquid flow condition.
5. The method for testing the permeability of the lower lying rock-soil layer and the permeability of uranium tailings by adopting the testing device as claimed in claim 3, is characterized in that: the method adopts a single mixed gas to measure the permeability of the lower lying rock-soil layer and the permeability of uranium tailings, and comprises the following specific steps:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data collector, controlling to close all electromagnetic valves through the data collector, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data collector, and simulating the temperature environment where uranium tailing and rock soil are located according to test requirements to set the temperature of a constant temperature box;
B. preparation of the Mixed gas required for the test
Opening an electromagnetic valve V1, an electromagnetic valve V2 and a booster pump to input carbon dioxide and nitrogen, adjusting air inflow through a first gas mass flow controller and a second gas mass flow controller, adjusting the proportion of the carbon dioxide and the nitrogen in the mixed gas according to test requirements, then opening an electromagnetic valve V3, carrying out primary pressure adjustment on the injected mixed gas through a high-pressure adjusting valve, feeding a gas pressure value back to a data collector through a first pressure real-time collector digital display meter, opening an electromagnetic valve V6 if the gas pressure value reaches the required gas pressure value during testing, opening electromagnetic valves V4 and V5 if the gas pressure value does not reach the required gas pressure value during testing, feeding the gas pressure value back to the data collector through a second pressure adjusting valve to carry out secondary pressure adjustment on the injected mixed gas so as to reach the required gas pressure value during testing;
C. opening the electromagnetic valve V7 and the electromagnetic valve V8, injecting mixed gas into the gas-liquid stirring device, feeding the air inflow back to the data acquisition unit by the third gas mass flow controller, and controlling the air inflow by the data acquisition unit;
D. testing gas permeability of lower lying rock-soil layer sample
D1, after the gas-liquid stirring device is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, a solenoid valve V13 and a solenoid valve V15, injecting the mixed gas into the rock-soil sample adding and holding device, starting an excitation device after the mixed gas enters the rock-soil sample adding and holding device, and simulating the vibration environment of the rock-soil according to the test requirements;
d2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end gas pressure value of the rock and soil sample confining device by using a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end gas pressure value of the rock and soil sample confining device by using the low pressure sensor, if the test pressure value is, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas pressure value at the inlet end of the rock-soil sample holding device;
d3, when the pressure value of the gas at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a first one-way valve, injecting the mixed gas into the gas-liquid separator, discharging the mixed gas from the gas outlet end of the gas-liquid separator, and allowing the mixed gas to enter a gas collecting bag through the dryer, the gas mass flowmeter and the first one-way valve;
d4, collecting gas flow by a data collector through a gas mass flowmeter, and automatically storing and processing data, thereby obtaining the gas permeability of the lower lying rock-soil layer sample under the conditions of different temperatures, different pressures and different gas flows;
E. testing gas permeability of uranium tailings
E1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and exhausting gas of the flow metering system;
e2, after the gas-liquid stirring device is filled with the mixed gas, opening a solenoid valve at a gas-liquid saturated liquid outlet end of the gas-liquid stirring device, a solenoid valve V12 and a solenoid valve V14, injecting the mixed gas into the uranium tailing filling device, starting an excitation device after the mixed gas enters the uranium tailing filling device, and simulating a vibration environment where rock soil is located according to test requirements;
e3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the gas pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the gas pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, and if the test, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the gas pressure value at the inlet end of the uranium tailings filling device;
e4, when the gas pressure value at the inlet end of the uranium tailings filling device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a first one-way valve, injecting the mixed gas into the gas-liquid separator, discharging the mixed gas from the gas outlet end of the gas-liquid separator, and allowing the mixed gas to enter a gas collecting bag through a dryer, a gas mass flowmeter and the first one-way valve;
e5, collecting the gas flow by the data collector through the gas mass flowmeter, and automatically storing and processing the data, thereby obtaining the gas permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas flows.
6. The method for testing the permeability of the lower lying rock-soil layer and the permeability of uranium tailings by adopting the testing device as claimed in claim 3, is characterized in that: the method adopts single liquid to measure the permeability of the lower lying rock-soil layer and the permeability of uranium tailings, and comprises the following specific steps:
A. preparation before testing
A1, taking down the rock-soil sample adding and holding device and the uranium tailing filling device from the vibration excitation device in the testing device, filling the obtained lower lying rock-soil layer sample with the standard size into the rock-soil sample adding and holding device, filling the uranium tailing into the uranium tailing filling device in a layering manner, compacting the uranium tailing to the in-situ uranium tailing density value, and reinstalling the rock-soil sample adding and holding device and the uranium tailing filling device onto the vibration excitation device after filling;
a2, starting a data collector, controlling to close all electromagnetic valves through the data collector, checking the air tightness of a pipeline, inputting the length of a sample loading cylinder of a rock-soil sample loading device and the length of a sample loading cylinder of a uranium tailing loading device into the data collector, and simulating the temperature environment where uranium tailing and rock soil are located according to test requirements to set the temperature of a constant temperature box;
B. opening a precision injection pump, a first piston intermediate container inlet end electromagnetic valve and a second piston intermediate container inlet end electromagnetic valve, injecting a test liquid into a first piston intermediate container and a second piston intermediate container from a liquid storage container according to a preset constant flow rate and constant pressure of the test liquid injection in a data acquisition device, after the first piston intermediate container and the second piston intermediate container are filled with the liquid to be tested, opening a first piston intermediate container outlet end electromagnetic valve, a second piston intermediate container outlet end electromagnetic valve, an electromagnetic valve V12 and an electromagnetic valve V13, injecting the test liquid into a rock soil sample holding device and a uranium tailings filling device, and closing the electromagnetic valves V12, V13, the first piston intermediate container inlet end electromagnetic valve and the second piston intermediate container inlet end electromagnetic valve after the test liquid is saturated;
C. testing liquid permeability of lower lying rock-soil layer sample
C1, opening the electromagnetic valve at the inlet end of the first piston intermediate container, the electromagnetic valve at the inlet end of the second piston intermediate container, the electromagnetic valve V13 and the electromagnetic valve V15, and injecting liquid into the rock and soil sample holding device;
c2, opening an inlet end electromagnetic valve of a confining pressure device of the rock and soil sample confining device, inputting pressure to the rock and soil sample confining device through a ring pressure device, establishing confining pressure around the test sample, preventing the test medium from streaming around the rock and soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after the pressure value fed back by a fourth pressure real-time collector digital display table reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display table, then opening an electromagnetic valve V11, firstly testing the inlet end liquid pressure value of the rock and soil sample confining device by using a high pressure sensor, if the test pressure value is in the range of a low pressure sensor, closing the electromagnetic valve V11, opening the electromagnetic valve V10, testing the inlet end liquid pressure value of the rock and soil sample confining device by using a low pressure sensor, if the test pressure value is, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the liquid pressure value at the inlet end of the rock-soil sample holding device;
c3, when the pressure value of the liquid at the inlet end of the rock-soil sample holding device reaches the pressure required by the test, opening the gas inlet end valve of the gas-liquid separator and the second one-way valve, injecting the liquid into the gas-liquid separator, discharging the liquid from the liquid outlet end of the gas-liquid separator, allowing the liquid to enter the liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by the balance with the data output function;
c4, collecting liquid flow by a data collector through a data output function balance, and automatically storing and processing data to obtain liquid permeability of the uranium tailings sample under the conditions of different temperatures, different pressures and different gas-liquid flow rates;
D. testing of uranium tailings liquid permeability
D1, closing the electromagnetic valve V13, the electromagnetic valve V15 and the electromagnetic valve at the inlet end of the confining pressure device of the rock and soil sample holding device, and discharging liquid of the flow metering system;
d2, opening the electromagnetic valve at the inlet end of the first piston intermediate container, the electromagnetic valve at the inlet end of the second piston intermediate container, the electromagnetic valve V12 and the electromagnetic valve V14, and injecting liquid into the uranium tailings filling device;
d3, opening an electromagnetic valve at the inlet end of a confining pressure device of the uranium tailing filling device, inputting pressure to the uranium tailing filling device through a ring pressure device, establishing confining pressure around a test sample to prevent a test medium from streaming around rock soil, opening an electromagnetic valve V16, a backpressure valve and a backpressure pump after a pressure value fed back by a fourth pressure real-time collector digital display meter reaches the backpressure set by a data collector, applying reverse backpressure to the test sample, feeding back the reverse backpressure value to the data collector by a third pressure real-time collector digital display meter, then opening an electromagnetic valve V11, testing the liquid pressure value at the inlet end of the uranium tailing filling device by using a high-pressure sensor, closing the electromagnetic valve V11 if the test pressure value is within the range of a low-pressure sensor, opening the electromagnetic valve V10, testing the liquid pressure value at the inlet end of the uranium tailing filling device by using a low-pressure sensor, and if the test, in the range of the high-pressure sensor, the high-pressure sensor is still adopted to test the liquid pressure value at the inlet end of the uranium tailings filling device;
d4, when the liquid pressure value at the inlet end of the uranium tailing filling device reaches the pressure required by the test, opening a gas inlet end valve of the gas-liquid separator and a second one-way valve, injecting the liquid into the gas-liquid separator, discharging the liquid from the liquid outlet end of the gas-liquid separator, allowing the liquid to enter a liquid storage container through the second one-way valve, and metering the liquid in the liquid storage container by using a balance with a data output function;
and D5, the data acquisition unit acquires liquid flow through the data output function balance and automatically stores and processes data, so that the liquid permeability of the uranium tailing sample under the conditions of different temperatures, different pressures and different gas-liquid flow rates is obtained.
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