CN110702876A - System for testing whole process of gas-water migration of rock-soil mass under deep multi-field coupling effect - Google Patents
System for testing whole process of gas-water migration of rock-soil mass under deep multi-field coupling effect Download PDFInfo
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Abstract
The invention discloses a rock-soil body gas-water migration whole-process testing system under deep multi-field coupling effect, which can simulate real deep geological environment conditions, adopts a fluid transmission control device to inject fluid into a rock core sample to simulate the condition of underground water, can test gas transmission characteristics under different water content conditions, can also calculate the permeability of water and other fluids of the rock core sample by recording the change condition of the injected water amount, adopts a temperature control device to heat a whole triaxial pressure chamber to simulate the geothermal condition in deep geology so as to research the influence of temperature on the gas migration and permeability of the rock core sample, adopts a gas migration control system to inject gas into the rock core sample to research the gas migration rule under THMC multi-field coupling or local coupling conditions, adopts a gas collection and analysis device to detect the gas injection process, the blocking degree of the core sample to various gases enables the obtained characteristics to have higher accuracy.
Description
Technical Field
The invention relates to the technical field of testing, in particular to a rock-soil body gas-water migration overall process testing system under the deep multi-field coupling effect.
Background
In the coal seam mining process, the stress state of the overlying rock mass changes, and the existence of a goaf is improvedThe overburden rock body provides a space for movement and deformation, so that overlying strata collapse and sink easily to cause damage, a collapse zone, a fracture zone and an overall movement and sink zone are formed from bottom to top in sequence, the movement and deformation of the strata can cause the change of the pore structure of the rock body, the permeability of a disturbance and damage area of the overburden rock body is obviously changed in a macroscopic view, and the part of the rock body is also called a mining rock body. The evolution of the permeability of the material can cause the migration rule of underground water and gas in an overlying rock stratum to change, and further cause the environmental disaster problems of water burst, sand bursting, water and soil loss, gas concentration increase in a mine and the like. Meanwhile, the gas-liquid migration rule of the nuclear waste deep geological disposal reservoir is researched, CO2The problems of fluid seepage characteristics in the geological sequestration process, shale gas and coal bed gas exploitation and the like are solved, and because disasters in deep mines are also possible to occur in the fields, and the fields relate to factors such as temperature, seepage and stress, the migration rule of gas/liquid in rock-soil bodies under the THMC multi-field coupling condition and the like, the gas permeability, the related migration characteristics and the like under the various conditions are very necessary to be tested. The traditional scheme usually calculates the required characteristics through related theoretical data, and the obtained result is low in accuracy.
Disclosure of Invention
Aiming at the problems, the invention provides a rock-soil body gas-water migration overall process testing system under the deep multi-field coupling effect.
In order to realize the purpose of the invention, the invention provides a rock-soil body gas-water migration whole-process test system under the deep multi-field coupling effect, which comprises: the system comprises a triaxial pressure chamber, an intelligent confining pressure control device, an intelligent axial pressure control device, a fluid transmission control device, a temperature control device, a gas migration control system and a gas collection and analysis device;
the pressure chamber of the triaxial pressure chamber is used for placing a rock core sample; the confining pressure intelligent control device is used for controlling the confining pressure of the triaxial pressure chamber; the intelligent axial pressure control device is used for controlling the axial pressure of the triaxial pressure chamber; the fluid transmission control device is used for injecting fluid into the core sample; the temperature control device is used for heating the triaxial pressure chamber; the gas migration control system is used for injecting gas into the core sample; the gas collecting and analyzing device is used for detecting the blocking degree of the core sample to various gases and the change condition of the content of various gases slowly permeating the core along with time in the gas injection process.
In one embodiment, the confining pressure intelligent control device, the axial pressure intelligent control device, the fluid transmission control device, the gas migration control system and the gas collection and analysis device are respectively connected with the triaxial pressure chamber through pipelines, and the temperature control device comprises a heating cover wrapping the outer part of the triaxial pressure chamber.
In one embodiment, the system for testing the gas-water migration whole process of the rock-soil mass under the deep multi-field coupling effect further comprises a gas leakage detector, and the gas leakage detector is used for detecting the gas tightness in the gas injection process.
In one embodiment, the gas migration control system comprises a gas source, a gas buffer cylinder, and a gauge;
the gas source injects gas into the gas buffering steel cylinder; the gas pressure in the gas buffering steel cylinder is measured to the strapping table in the gas injection process, after the gas pressure in the gas buffering steel cylinder reaches the experimental requirement, the gas source is closed, and the valve at the gas injection end of the triaxial pressure chamber is opened to inject gas into the sample.
As an embodiment, the matched software of the gas migration control system records the pressure change and the temperature change measured by the meter at the inlet end in the gas injection process and calculates the permeability.
In one embodiment, the gas collection and analysis device is disposed at an outlet end of the shaft plenum.
In one embodiment, the system for testing the whole process of gas-water transport of the rock-soil body under the deep multi-field coupling effect further comprises a high-rigidity dynamic and static loading frame, and the high-rigidity dynamic and static loading frame is used for lifting the pressure chamber of the triaxial pressure chamber.
As an embodiment, the high-rigidity dynamic and static loading frame lifts up the pressure chamber of the triaxial pressure chamber to put a core sample wrapped by a fluororubber sleeve; the confining pressure intelligent control device sets confining pressure of the three-axis pressure chamber according to experimental requirements, and the axial pressure intelligent control device sets axial pressure of the three-axis pressure chamber according to the experimental requirements so as to simulate deep geological environment conditions; the fluid transmission control device injects fluid into the rock core sample to simulate the condition of underground water and test the gas transmission characteristics under the conditions of different water contents; the temperature control device heats the whole triaxial pressure chamber to simulate the condition of geothermal heat in deep geology; the gas migration control system injects gas into the core sample so as to research the gas migration rule under the THMC multi-field coupling or local coupling condition; in the gas collection and analysis device, the blocking degree of the core sample to various gases is detected in the gas injection process, and the components at the outlet end of the analysis are detected in the gas breakthrough test process to judge whether the gas breaks through the core sample.
The rock-soil body gas-water migration overall-process testing system under the deep multi-field coupling effect adopts the confining pressure intelligent control device to control the confining pressure of the three-axis pressure chamber, adopts the axial pressure intelligent control device to control the axial pressure of the three-axis pressure chamber so as to simulate the real deep geological environment conditions, adopts the fluid transmission control device to inject fluid into the rock core sample so as to simulate the condition of underground water, thus testing the gas transmission characteristics under the conditions of different water contents, also can calculate the permeability of the water and other fluids of the rock core sample by recording the change condition of the injected water quantity, adopts the temperature control device to heat the whole three-axis pressure chamber so as to simulate the geothermal condition in the deep geology, thereby researching the influence of temperature on the gas migration and permeability of the rock core sample, and adopts the gas migration control system to inject gas into the rock core sample, the method is used for researching the gas migration rule under the THMC multi-field coupling or local coupling condition, and the gas collection and analysis device is adopted to detect the blocking degree of the core sample to various gases in the gas injection process, so that the obtained characteristics of the gas transmission characteristic, the permeability, the gas migration rule, the blocking degree of the core sample to various gases and the like are based on the real deep geological environment condition, the deep mine environment such as the geothermal energy in the deep geology and the like, and the method has higher accuracy.
Drawings
FIG. 1 is a schematic diagram of a testing system for the whole process of gas-water migration of rock-soil mass under the deep multi-field coupling effect according to an embodiment;
FIG. 2 is a schematic diagram of a whole process testing system for gas-water migration of rock-soil bodies under the action of deep multi-field coupling according to another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a rock-soil mass gas-water transport and movement overall process testing system under deep multi-field coupling action according to an embodiment, and the system comprises: a triaxial pressure chamber 11, a confining pressure intelligent control device 12, an axial pressure intelligent control device 13, a fluid (such as water) transmission control device 14, a temperature control device (not shown in fig. 1), a gas migration control system 16 and a gas collection and analysis device 17;
the pressure chamber of the triaxial pressure chamber 13 is used for placing a core sample; the confining pressure intelligent control device 12 is used for controlling the confining pressure of the triaxial pressure chamber 11; the intelligent axial pressure control device 13 is used for controlling the axial pressure of the triaxial pressure chamber 11; the fluid transfer control device 14 is used to inject a fluid (e.g., water) into the core sample; the temperature control device is used for heating the triaxial pressure chamber; the gas migration control system 16 is used for injecting gas into the core sample; the gas collecting and analyzing device 17 is used for detecting the blocking degree of the core sample to various gases and the change condition of the content of various gases slowly permeating the core along with the time in the gas injection process.
In the rock-soil body gas-water migration whole-process testing system under the deep multi-field coupling effect, confining pressure of a triaxial pressure chamber 11 is controlled by a confining pressure intelligent control device 12, axial pressure of the triaxial pressure chamber 11 is controlled by an axial pressure intelligent control device 13 to simulate real deep geological environment conditions, fluid is injected into a rock core sample by a fluid transmission control device 14 to simulate the condition of underground water, so that gas transmission characteristics under different water content conditions can be tested, the permeability of water and other fluids of the rock core sample can be calculated by recording the change condition of the injected water quantity, the whole triaxial pressure chamber is heated by a temperature control device to simulate the condition of geothermal heat in deep geology, the influence of temperature on gas migration and permeability of the rock core sample is researched, and the gas migration control system 16 is used for injecting gas into the rock core sample, the gas migration rule under the THMC multi-field coupling or local coupling condition is researched, the gas collection and analysis device 17 is adopted to detect the blocking degree of the core sample to various gases in the gas injection process, so that the obtained characteristics of the gas transmission characteristic, the permeability, the gas migration rule, the blocking degree of the core sample to various gases and the like are based on the real deep geological environment condition, the deep underground heat in the deep geology and other deep mine environments, and the accuracy is high.
In one embodiment, the confining pressure intelligent control device, the axial pressure intelligent control device, the fluid transmission control device, the gas migration control system and the gas collection and analysis device are respectively connected with the three-axis pressure chamber through pipelines so as to ensure accurate control of the three-axis pressure chamber, and the temperature control device comprises a heating cover wrapping the outer portion of the three-axis pressure chamber so as to wrap the whole three-axis pressure chamber and heat the whole three-axis pressure chamber, so that the geothermal condition in deep geology can be simulated, and the influence of temperature on the gas migration and permeability of a rock core sample can be researched.
In one embodiment, the system for testing the gas-water migration whole process of the rock-soil mass under the deep multi-field coupling effect further comprises a gas leakage detector, and the gas leakage detector is used for detecting the gas tightness in the gas injection process.
Because the general permeability of the core sample is extremely low, the air tightness of the rock-soil body gas-water migration whole-process testing system under the deep multi-field coupling effect is very important to the accuracy of the test, especially at the joints between some pipelines and system devices. In the embodiment, the gas leakage detector can be used for detecting the gas tightness (such as each pipeline and related joints) of the whole system in the gas injection process, so that the good gas tightness of the joints and the whole system is ensured. Specifically, the front end of the gas leakage detector is provided with a detecting head which is close to a region to be detected, the detector detects the content of gas injected into the current region and makes a 'dripping' sound, and the sound becomes rapid along with the increase of the content, so that the detection of the gas tightness of the rock-soil body gas-water migration whole-process test system under the deep multi-field coupling effect can be realized.
In one embodiment, the gas migration control system comprises a gas source, a gas buffer cylinder, and a gauge;
the gas source injects gas into the gas buffering steel cylinder; the gas pressure in the gas buffering steel cylinder is measured to the strapping table in the gas injection process, after the gas pressure in the gas buffering steel cylinder reaches the experimental requirement, the gas source is closed, and the valve at the gas injection end of the triaxial pressure chamber is opened to inject gas into the sample.
As an embodiment, the matched software of the gas migration control system records the pressure change and the temperature change measured by the meter at the inlet end in the gas injection process and calculates the permeability.
In this embodiment, the gas source (generally inert gas) can be according to the atmospheric pressure needs of experiment to the gas buffering steel bottle gas injection, measures the atmospheric pressure in the gas buffering steel bottle this moment through the strapping table. After the air pressure in the gas buffering steel cylinder meets the experimental requirements, the air source is closed, the valve at the air injection end of the triaxial pressure chamber is opened, the sample is injected, and at the moment, the air pressure change at the inlet end in the air injection process can be recorded at any time by the metering meter and related matched software for the subsequent permeability calculation.
In one embodiment, the gas collection and analysis device is disposed at an outlet end of the shaft plenum.
In this embodiment, the exit end of triaxial pressure chamber is furnished with gas collection and analytical equipment, can effectually find out the gas injection in-process, and the separation degree of rock core sample (especially some special materials) to various gas. And when the device is used in a gas breakthrough test process, the components at the outlet end can be detected and analyzed to judge whether the gas breaks through the core sample (especially in the field of nuclear waste storage research, the device is used for researching the blocking effect of bentonite on radioactive nuclear waste).
In one embodiment, the system for testing the whole process of gas-water transport of the rock-soil body under the deep multi-field coupling effect further comprises a high-rigidity dynamic and static loading frame, and the high-rigidity dynamic and static loading frame is used for lifting the pressure chamber of the triaxial pressure chamber.
In the embodiment, the pressure chamber of the triaxial pressure chamber is lifted by adopting the high-rigidity dynamic and static loading frame, so that a core sample can be put in for testing.
Further, after the core sample is put in, the pressure chamber is covered, and the screw is screwed on to ensure the sealing of the triaxial pressure chamber. The core sample can be wrapped by a fluororubber sleeve, and when the core sample is placed in a pressure chamber, the annular deformer and the axial deformer are arranged at the same time to measure the strain condition of the core under the corresponding confining pressure and axial pressure conditions.
As an embodiment, the high-rigidity dynamic and static loading frame lifts up the pressure chamber of the triaxial pressure chamber to put a core sample wrapped by a fluororubber sleeve; the confining pressure intelligent control device sets confining pressure of the three-axis pressure chamber according to experimental requirements, and the axial pressure intelligent control device sets axial pressure of the three-axis pressure chamber according to the experimental requirements so as to simulate deep geological environment conditions; the fluid transmission control device injects fluid into the rock core sample to simulate the condition of underground water and test the gas transmission characteristics under the conditions of different water contents; the temperature control device heats the whole triaxial pressure chamber to simulate the condition of geothermal heat in deep geology; the gas migration control system injects gas into the core sample so as to research the gas migration rule under the THMC multi-field coupling or local coupling condition; in the gas collection and analysis device, the blocking degree of the core sample to various gases is detected in the gas injection process, and the components at the outlet end of the analysis are detected in the gas breakthrough test process to judge whether the gas breaks through the core sample.
Specifically, the three-axis pressure chamber, the confining pressure intelligent control device, the axial pressure intelligent control device, the fluid transmission control device, the temperature control device, the gas migration control system, the gas collection and analysis device, the high-rigidity dynamic and static loading frame and other structures can be provided with related control software, and the control software of each structure can be arranged in a control center of the corresponding structure or at an intelligent control terminal of a computer and the like connected with the corresponding structure.
The working process of the rock-soil body gas-water migration overall process testing system under the deep multi-field coupling effect can comprise the following steps: the pressure chamber of the triaxial pressure chamber is lifted by using a high-rigidity dynamic and static loading frame, so that a core sample can be put in for testing. After the core sample is put in, the pressure chamber is covered, and the screw is screwed on to ensure the sealing of the triaxial pressure chamber. The core sample is wrapped by a fluororubber sleeve, and when the core sample is placed in a pressure chamber, a circumferential deformation meter and an axial deformation meter are simultaneously installed to measure the strain condition of the core under the corresponding confining pressure and axial pressure conditions. And (3) setting confining pressure and axial pressure according to experimental needs (experimental requirements) by adopting a confining pressure intelligent control device and an axial pressure intelligent control device so as to simulate real deep geological environmental conditions. The core sample is injected with water by using a fluid (water) transmission control device so as to simulate the condition of underground water, the gas transmission characteristics under the conditions of different water contents are tested, and meanwhile, the change condition of the injected water amount can be recorded by matching with related software, so that the water permeability of the sample is calculated. Meanwhile, the whole triaxial pressure chamber can be heated by matching with a temperature control device so as to simulate the geothermal condition in deep geology, and therefore the influence of temperature on gas migration and permeability of the rock core sample is researched. After the initial conditions of the core sample are set, gas is injected into the core sample by using a gas migration control system to research the gas migration rule under the THMC multi-field coupling or local coupling conditions; the specific operation process comprises the following steps: the gas source (generally inert gas) injects gas into the gas buffering steel cylinder according to the experimental gas pressure requirement, and the gas pressure in the gas buffering steel cylinder is measured through the gauge. And then closing the gas source, opening a valve at the gas injection end of the triaxial pressure chamber, injecting gas into the sample, and recording the pressure change at the inlet end in the gas injection process by the metering meter and the matched software at any time for the subsequent permeability calculation. The outlet end of the triaxial pressure chamber is provided with a gas collecting and analyzing device, so that the blocking degree of the core sample (especially some special materials) to various gases in the gas injection process can be effectively detected. When the gas breakthrough test device is used in a gas breakthrough test process, components at the outlet end can be detected and analyzed to judge whether gas breaks through a core sample (particularly in the field of nuclear waste storage research, the barrier effect of bentonite on radioactive nuclear waste is researched).
Further, as the permeability of the core sample used in the test is generally extremely low, the airtightness of the whole system is very important for the accuracy of the test, especially for the joints between some pipelines and system devices. The gas leakage detector can be used for detecting the gas tightness of the whole set of system in the gas injection process, and the good gas tightness of the joint and the whole set of system is ensured. A detecting head can be arranged at the front end of the gas leakage detector, the detecting head is close to an area to be detected, the detector detects the content of gas injected into the current area and makes a 'drop-and-drip' sound, and the sound becomes urgent along with the increase of the content. Finally, the gas permeability of the rock core can be calculated through a meter (a meter of a gas migration control system) at the gas inlet end, then the conditions such as axial pressure, confining pressure, temperature and gas injection pressure are changed according to the actual engineering requirements, and the gas migration rule and other test requirements under various conditions are researched.
In one embodiment, the rock-soil body gas-water migration whole-process testing system under the deep multi-field coupling effect can be further provided with an intelligent data acquisition device to acquire various types of data generated in the testing process.
In an embodiment, the testing system for the whole process of gas-water migration of the rock-soil body under the deep multi-field coupling effect is used for carrying out related testing work, in one example, a schematic diagram of the testing system for the whole process of gas-water migration of the rock-soil body under the deep multi-field coupling effect in the working process can be shown in fig. 2, related control software can be arranged on the structures such as the triaxial pressure chamber, the confining pressure intelligent control device, the axial pressure intelligent control device, the fluid transmission control device, the temperature control device, the gas migration control system, the gas collection and analysis device, the high-rigidity dynamic and static loading frame and the like, as shown in fig. 2, the structures can be externally connected with a control computer, and the control software of a certain structure can be arranged on the control computer connected with the structures. The rock-soil body gas-water transport and movement overall process testing system under the deep multi-field coupling effect can have the following technical indexes:
a triaxial pressure chamber:
maximum confining pressure: 0-60 MPa (may be greater than the upper limit), maximum axial pressure: 0-60 MPa (can be larger than the upper limit), full-automatic oil filling, oil absorption and filtration, self-balancing design, and capability of simultaneously applying lateral pressure and axial pressure to realize automatic confining pressure loading;
working temperature: 20-150 ℃;
sample size containment: the diameter is 25, 37, 50, 55, 65 and 75mm, and the height is 15-150 mm;
external dimensions: no more than 350mm (diameter) multiplied by 500mm (height), and the whole size is as small as possible under the condition of meeting the size of a sample;
the channel requirement is as follows: the inlet end is provided with two inlets, one is an oil way inlet, the other is a water (gas) way inlet, and the outlet end is provided with a water (gas) way outlet and one to two oil way outlets;
a displacement sensor: the sensor comprises displacement sensors in the axial direction and the radial direction, or a sensor mounting channel is reserved;
materials: the high-strength stainless steel can prevent general acid-base salt corrosion, and is reserved with gas permeation and liquid pulse permeation experiment interfaces, ultrasonic testing, acoustic emission testing, resistivity testing, water-gas two-phase unsaturated permeability testing, mechanical testing of joint-containing samples and other test interfaces;
electronic sensor interface: 12 paths of the sound emitting device can be compatible with devices such as sound waves and sound emission.
Confining pressure and axle pressure intelligent control device:
the confining pressure range is 0-60 MPa;
pressure accuracy <0.01MPa
Flow range: 0.01-60 ml/min;
overpressure overflow valve protection (non-rupture disk, recyclable);
the control modes comprise flow control, step pressure control and constant pressure control; LVDT displacement control (axial compression control only).
Fluid (water) transfer control device:
the pressure range is 0-60 MP;
pressure accuracy: <0.01 MPa;
flow range: 0.01-60 ml/min;
overpressure overflow valve protection (non-rupture disk, recyclable);
the control mode is as follows: flow control, step pressure control, constant pressure control;
pump cylinder volume: 100 ml;
the software can set protection pressure and protection displacement;
gas leakage detection system:
ambient temperature: -20 to 60 ℃;
precision: 10-5 cc/sec;
detectable gas: helium, argon, and the like;
humidity range: 0-99% RH;
the control mode is as follows: the device may be activated by turning on a switch or button, and for testing purposes it is preferably mobile and independent of the gas device, and may be moved to a position at any time for testing.
High rigidity dynamic and static loading frame:
the static loading force is more than or equal to 1500KN, a magnetic displacement sensor and a double-feedback thrust sensor are arranged in the static loading force sensor;
the stroke is 100mm, and the maximum loading speed is more than or equal to 800 mm/min;
the rigidity is 5 MN/mm;
and the hydraulic lifting device is used for automatically lifting the pressure chamber.
Axial & hoop deformation measurement device (for indoor measurement of axial and radial strain in high temperature and high pressure environment):
axial and circumferential deformation measuring devices (used for indoor measurement of axial and radial strain in high-temperature and high-pressure environments);
2 LVDT sensors, range: 5mm, precision: less than or equal to 0.25 percent; pressure bearing: 0-140 MPa, temperature resistance: the room temperature is 150 ℃ to be used for axial deformation measurement;
radial measuring device has the fixer, and the pressure-bearing: 0-140 MPa, temperature resistance: the temperature is between room temperature and 150 ℃ and is used for measuring radial variation;
the strain gauge type deformation measuring device is directly pasted on the sample, and the measuring range is as follows: 5%, pressure bearing: 0-100 MPa, temperature resistance: the temperature is between room temperature and 150 ℃, and the method is used for measuring the anisotropic deformation of the jointed rock.
A temperature control device:
working temperature: 20-150 ℃;
precision: plus or minus 1 ℃;
a thermocouple sensor is arranged in the confining pressure chamber;
the temperature control box adopts double feedback control of a heating sleeve temperature sensor and an confining pressure chamber temperature sensor, and has a high-temperature automatic power-off function.
Gas collection and analysis device:
each gas component can be automatically separated and distinguished from mixed gas (such as argon and helium), and qualitative and quantitative (quantitative can be accepted to be represented by volume concentration) analysis is carried out on collected gas;
the sample feeding device is provided with a capillary tube which can be heated and can be insulated to 200 ℃, so that gas is inhibited from condensing on the wall of the capillary tube, and the smoothness of the sample feeding device is ensured;
detection pressure range: 10-5MPa to 0.1MPa (the minimum value must be ensured);
atomic mass range of the probe gas: not less than 100amu (including 100 amu);
the software can automatically collect, display and analyze the data, so as to realize online (online is necessary, and offline analysis cannot meet the requirements) qualitative and quantitative analysis of the gas;
a sample introduction system: the automatic pressure control system automatically adjusts the opening of the valve according to the pressure change of the process gas to ensure the proper sampling amount;
a vacuum system: a shunting molecular pump and a diaphragm pump;
detection limit (C-SEM) of 1 ppm;
the fastest scanning speed is as follows: 2 ms/amu;
interface: the outlet end structure is an 1/8 interface and is connected with the outlet end of a pressure chamber of the seepage test system under the THMC multi-field coupling condition.
The matched soft nail:
the strain control mode comprises a constant displacement and displacement increment control mode, and the displacement feedback can be axial displacement or lateral displacement;
the axial stress control mode comprises a constant force and force increment control mode;
the confining pressure can be controlled by flow or pressure;
displaying a stress-strain curve, a strain-time curve and a stress-time curve in real time;
the inherent permeability can be calculated according to the seepage test result;
fitting test results by selecting different yield criteria (including a mole-coulomb criterion, a D-P criterion, a Hook-Brown criterion, a three-shear strain energy yield criterion and the like) and calculating corresponding parameters;
the method can carry out numerical simulation on tests under other conditions according to typical test results under partial conditions, and invert the evolution law of mechanical properties and permeability properties in the triaxial compression failure process, and comprises the following steps: parameters such as confining pressure, elastic modulus, Poisson's ratio, yield criterion and initial permeability can be input, full stress-strain curve inversion, effective elastic modulus, damage and plastic deformation prediction in the triaxial compression failure process, evolution rules such as inherent permeability in the triaxial compression failure process and the like are input, and the failure proximity index prediction is carried out;
and providing a software installation file so as to be installed and used when a problem occurs in the computer or the computer is replaced.
Intelligent data acquisition device:
the control channel has three feedback control capacity resolutions of force, displacement and flow: not less than 16 bits;
the collected data storage path and the collection interval time can be set;
a plurality of data acquisition channels are reserved, so that detection devices for sound waves, sound emission and the like can be conveniently expanded in the later period;
the software can set protection pressure and protection displacement.
The rock-soil body gas-water migration overall process testing system under the deep multi-field coupling effect can effectively test various complex engineering problems, and the functions which can be effectively realized are as follows:
1. the gas and liquid steady state method and transient state method penetration tests (the inherent permeability and the partial saturated rock sample permeability coefficient can be calculated) can be carried out under the conditions of full coupling or partial coupling of temperature (T), seepage (H), stress (M) and chemical corrosion (C).
2. The upper end of the pressure chamber is provided with a gas collecting and analyzing device which is mainly used for tests such as gas collection, gas component analysis and discrimination and the like. The conventional gas collection and analysis tests are performed by a flow meter, which has a problem that it is difficult to clearly separate pore water and pore gas pressure, and thus it is necessary to perform quantitative and qualitative analysis by means of a gas analyzer.
3. The conventional uniaxial compression test, the conventional triaxial compression test, the triaxial compression rheological test and the triaxial compression relaxation test can also be used for load test, deformation test and full curve test.
4. The confining pressure loading system adopts high-precision closed-loop servo control, can ensure that pressure and volume can be accurately controlled under a high-temperature state, and a shaft pressure loading mode is loaded through a loading frame, so that the large-tonnage pressure is not lower than 1500KN, and the hydraulic lifting device is used for automatically lifting a pressure chamber.
5. High-precision closed-loop servo control can be performed, strain and stress control can be performed, and mechanical behavior tests after destruction can also be performed.
6. Different yield criteria (including the mole-coulomb criterion, the D-P criterion, the Hook-Brown criterion, the triple shear energy yield criterion, etc.) can be selected to fit the test results and the corresponding parameters are calculated.
7. The method can be expanded to carry out mechanical tests of stress spindle rotation and stress principal value simultaneous change, hydraulic fracturing tests, Brazilian fracturing tests and high-temperature high-pressure triaxial acoustic emission 3D simulation imaging analysis tests.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A rock-soil body gas-water migration overall process test system under deep multi-field coupling effect is characterized by comprising: the system comprises a triaxial pressure chamber, an intelligent confining pressure control device, an intelligent axial pressure control device, a fluid transmission control device, a temperature control device, a gas migration control system and a gas collection and analysis device;
the pressure chamber of the triaxial pressure chamber is used for placing a rock core sample; the confining pressure intelligent control device is used for controlling the confining pressure of the triaxial pressure chamber; the intelligent axial pressure control device is used for controlling the axial pressure of the triaxial pressure chamber; the fluid transmission control device is used for injecting fluid into the core sample; the temperature control device is used for heating the triaxial pressure chamber; the gas migration control system is used for injecting gas into the core sample; the gas collecting and analyzing device is used for detecting the blocking degree of the core sample to various gases and the change condition of the content of various gases slowly permeating the core along with time in the gas injection process.
2. The system for testing the whole process of gas-water migration of the rock-soil body under the deep multi-field coupling effect according to claim 1, wherein the confining pressure intelligent control device, the axial pressure intelligent control device, the fluid transmission control device, the gas migration control system and the gas collection and analysis device are respectively connected with the triaxial pressure chamber through pipelines, and the temperature control device comprises a heating cover wrapping the outer part of the triaxial pressure chamber.
3. The system for testing the gas-water migration whole process of the rock-soil mass under the deep multi-field coupling effect according to claim 1, further comprising a gas leakage detector, wherein the gas leakage detector is used for detecting the gas tightness in the gas injection process.
4. The system for testing the whole process of gas-water migration of the rock-soil mass under the deep multi-field coupling action according to claim 1, wherein the gas migration control system comprises a gas source, a gas buffer steel cylinder and a gauge;
the gas source injects gas into the gas buffering steel cylinder; the gas pressure in the gas buffering steel cylinder is measured to the strapping table in the gas injection process, after the gas pressure in the gas buffering steel cylinder reaches the experimental requirement, the gas source is closed, and the valve at the gas injection end of the triaxial pressure chamber is opened to inject gas into the sample.
5. The system for testing the whole process of gas-water migration of the rock-soil mass under the deep multi-field coupling effect according to claim 4, wherein the supporting software of the gas migration control system records the pressure change and the temperature change measured by the meter at the inlet end in the gas injection process, and calculates the permeability.
6. The deep multi-field coupling rock-soil mass gas-water transport overall process testing system of claim 1, wherein the gas collection and analysis device is disposed at an outlet end of the shaft pressure chamber.
7. The system for testing the whole process of gas-water migration of the rock-soil body under the deep multi-field coupling action according to any one of claims 1 to 6, further comprising a high-rigidity dynamic and static loading frame, wherein the high-rigidity dynamic and static loading frame is used for lifting the pressure chambers of the three-axis pressure chambers.
8. The system for testing the whole process of gas-water transport of rock-soil bodies under the deep multi-field coupling effect according to claim 7, wherein the high-rigidity dynamic and static loading frame lifts up a pressure chamber of a triaxial pressure chamber to put a core sample wrapped by a fluororubber sleeve; the confining pressure intelligent control device sets confining pressure of the three-axis pressure chamber according to experimental requirements, and the axial pressure intelligent control device sets axial pressure of the three-axis pressure chamber according to the experimental requirements so as to simulate deep geological environment conditions; the fluid transmission control device injects fluid into the rock core sample to simulate the condition of underground water and test the gas transmission characteristics under the conditions of different water contents; the temperature control device heats the whole triaxial pressure chamber to simulate the condition of geothermal heat in deep geology; the gas migration control system injects gas into the core sample so as to research the gas migration rule under the THMC multi-field coupling or local coupling condition; in the gas collection and analysis device, the blocking degree of the core sample to various gases is detected in the gas injection process, and the components at the outlet end of the analysis are detected in the gas breakthrough test process to judge whether the gas breaks through the core sample.
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| CN113654968A (en) * | 2021-08-30 | 2021-11-16 | 中国矿业大学 | Low-permeability medium gas permeability testing device and installation and testing method thereof |
| CN114112768A (en) * | 2021-11-19 | 2022-03-01 | 中国铁建重工集团股份有限公司 | High energy-gathering combined barrier-breaking test system and method |
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| CN115405286A (en) * | 2022-08-16 | 2022-11-29 | 中国石油大学(华东) | Measuring device and measuring method for anisotropic reservoir stress sensitivity |
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