CN113311133A

CN113311133A - Test method for repairing heterogeneous soil groundwater

Info

Publication number: CN113311133A
Application number: CN202110702100.9A
Authority: CN
Inventors: 邓英尔; 宋刚; 李鹏杰; 彭鑫; 苏虎; 田旭; 史振环; 杨鸿坤; 邹东雅
Original assignee: Chengdu Univeristy of Technology
Current assignee: Chengdu Univeristy of Technology
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2021-08-27
Anticipated expiration: 2041-06-23
Also published as: CN113311133B

Abstract

The invention discloses a test method for repairing heterogeneous soil groundwater, which belongs to the technical field of in-situ treatment tests and is characterized by comprising the following steps: s1, laying a layer of 120-mesh filter cloth on the inner wall of the periphery of a transparent box body of the test testing device; s2, filling the water-containing medium into a transparent box in batches; s3, erecting a camera; s4, injecting pollutants into the aquifer in the transparent box body through the sampling tube; s5, adjusting the flow; s6, opening valves on the sampling pipes to obtain water samples of the heterogeneous soil groundwater at different positions for detection and analysis; s7, after the test is finished, watching the camera video; s8, adjusting parameters of the circulation well and the aeration well, and repeating the steps S1-S7. The invention can monitor, record and obtain the head value, solute and non-aqueous phase moving distance in real time, simulate the hydrodynamic field of the circulation well and the aeration well, and has simple and easy operation and strong flexibility of the whole testing method.

Description

Test method for repairing heterogeneous soil groundwater

Technical Field

The invention relates to the technical field of in-situ treatment tests, in particular to a test method for repairing groundwater in heterogeneous soil.

Background

The circulation well and the aeration well are used as heterogeneous soil-underground water pollutant in-situ treatment technologies, are one of hot spot technologies in recent years, and have the characteristics of low economic cost and good treatment effect. But the circulating well and the aeration well still have few test devices for researching the solute and non-aqueous phase migration of the in-situ technology, the parameters of the well process and the remediation effect for treating different homogeneous and heterogeneous soil-underground water conditions in the process of treating pollutants.

Chinese patent publication No. CN 102219293a, published as 2011, 10/19, discloses an improved aeration well for in-situ remediation of polluted groundwater, which is characterized in that an inner well pipe is sleeved in an outer well pipe, the inner well pipe is fixed in the outer well pipe through an upper fixing support and a lower fixing support, the lower part of the inner well pipe is provided with an aeration head, the aeration head is connected with an aeration pump through an aeration pipe and an adjusting valve fixed at the top end of the outer well pipe, the upper part of the outer well pipe is provided with an exhaust hole, the exhaust hole is connected with a polluted gas monitor, the top end of the inner well pipe is lower than the exhaust hole, the lower part of the upper exhaust hole of the outer well pipe is provided with an upper perforated pipe, the top hole of the upper perforated pipe is lower than the inner well pipe, the lower section of the outer well pipe is provided with a lower perforated pipe, the top hole of the lower perforated pipe is higher than the bottom end surface of the inner well pipe, and the bottom end surface of the outer well pipe is in contact with a bottom plate of a polluted groundwater layer.

The patent document discloses an improved aeration well for in situ remediation of contaminated groundwater that achieves reduced lateral diffusion of contaminants by increasing the vertical flow of groundwater. Compared with the existing underground water aeration technology and pumping treatment technology, the technology is simpler, can be continuously operated only by conventional maintenance, improves the repair efficiency, and reduces the repair cost and the maintenance cost. However, the parameters of the aeration well are single in function and cannot be flexibly adjusted, and the method cannot be used for researching the influence factors of the vertical circulation well and the aeration well in the aspect of pollutant remediation, and cannot be used for simulating non-aqueous phase migration and solute migration and simulating the remediation effects of the circulation well and the aeration well under different boundary conditions.

Disclosure of Invention

The invention can monitor, record and obtain the head value, solute and non-aqueous phase moving distance in real time, and flexibly adjust the parameters of the circulation well and the aeration well, thereby being convenient for exploring the selection of well processes in different homogeneous and heterogeneous soil underground water models, exploring the hydrodynamic flow fields, the solute and the non-aqueous phase chemical fields of the circulation well and the aeration well in different models, and simulating the hydrodynamic fields of the circulation well and the aeration well.

The invention is realized by the following technical scheme:

an experimental test method for repairing heterogeneous soil groundwater, comprising the steps of:

s1, laying a layer of 120-mesh filter cloth on the inner wall of the periphery of a transparent box body of the test testing device, and wrapping the first sieve mesh outer well, the second sieve mesh outer well, the first circulating pipe, the second circulating pipe, the third circulating pipe and the fourth circulating pipe by the 120-mesh filter cloth;

s2, filling the water-containing medium into a transparent box in batches, and compacting once every 10cm in the process of filling the water-containing medium;

s3, after the water-containing medium is filled, erecting a camera to enable the camera shooting frame to be parallel to the boundary of the transparent box body, slowly injecting water into the first tank body, discharging water from the second tank body, and discharging air in the water-containing medium until the water head of the piezometer pipe is stable;

s4, injecting pollutants into the aquifer in the transparent box body through the sampling tube;

s5, starting the first flow regulator or the second flow regulator, and regulating the flow to enable the circulation well to work until the head of the piezometer pipe is stabilized again;

s6, opening a valve on the sampling pipe to obtain water samples of the heterogeneous soil groundwater at different positions for detection and analysis after the water head of the pressure measuring pipe is stabilized again;

s7, after the test is finished, watching a video, when a waterhead, solute or non-aqueous phase migration numerical value at a certain moment needs to be read, pausing the video to obtain a waterhead value, a solute or non-aqueous phase vertical diffusion distance value through a numerical value measured by a vertical scale corresponding to a picture recorded by shooting, and obtaining a solute or non-aqueous phase horizontal diffusion distance value through a numerical value measured by a horizontal scale corresponding to the moment;

s8, adjusting parameters of the circulation well and the aeration well, and repeating the steps S1-S7.

In the step S1, the test device includes a transparent box, a first flow regulator, a second flow regulator, a centrifugal pump, an aeration pump, an air inlet pipe, a water inlet pipe, and a water outlet pipe, wherein the front surface of the transparent box is provided with a plurality of sampling pipes, a plurality of vertical scales, and a horizontal scale, the sampling pipes are fixed with valves, the back surface of the transparent box is provided with a plurality of pressure measuring pipes, one side of the transparent box is provided with a first tank body provided with a water inlet, the other side of the transparent box is provided with a second tank body provided with a water outlet, the side wall of the transparent box is provided with through holes, the transparent box is respectively communicated with the first tank body and the second tank body, a first sieve mesh outer well and a second sieve mesh outer well communicated with the atmosphere are fixed in the transparent box, a circulation well is fixed in the first sieve mesh outer well, the circulation well includes a first circulation pipe, a first connection pipe, and a second circulation pipe, the upper end of the first circulation pipe is a closed end, the lower end of the second circulating pipe is embedded with a first plug, the lower end of the second circulating pipe is a closed end, the upper end of the second circulating pipe is embedded with a second plug, a plurality of small holes are evenly distributed on the first circulating pipe and the second circulating pipe, the first circulating pipe is connected with the upper end of a first connecting pipe in a sliding mode, the second circulating pipe is connected with the lower end of the first connecting pipe in a sliding mode, one end of a water inlet pipe is connected with a centrifugal pump, the other end of the water inlet pipe is connected with the first circulating pipe, one end of a water outlet pipe is connected with the centrifugal pump, the other end of the water outlet pipe is connected with a second circulating pipe, the centrifugal pump is electrically connected with a first flow regulator, an aeration well is arranged in a second sieve mesh outer well, the aeration well comprises a third circulating pipe, a second connecting pipe and a fourth circulating pipe, the upper end of the third circulating pipe is a closed end, the lower end of the fourth circulating pipe is a closed end, the fourth circulating pipe and a plurality of small holes are evenly distributed on the third circulating pipe and the fourth circulating pipe, the upper end sliding connection of third circulating pipe and second connecting pipe, the cover has the sealing washer on the third circulating pipe, the sealing washer is fixed on the inner wall of second sieve mesh outer well, the middle part parcel of second sieve mesh outer well has the seal membrane, the lower extreme sliding connection of fourth circulating pipe and second connecting pipe, the blind end of fourth circulating pipe is higher than the lower extreme of seal membrane, the one end and the aeration pump of intake pipe are connected, the other end and the fourth circulating pipe of intake pipe are connected, the aeration pump is connected with second flow regulator electricity.

In the step S2, the water-containing medium is a homogeneous water-containing medium, a non-homogeneous water-containing medium, a pressure-bearing water-containing medium or a diving water-containing medium, when the water-containing medium is the homogeneous water-containing medium, the interior of the transparent box body is filled with a material medium, and the material medium is compacted once every 10cm to simulate the homogeneous water-containing medium; when the lens is a heterogeneous aqueous medium, filling different materials in each layer or putting muddy soil wrapped by a sealing film into the lens body; when the water-bearing medium is a pressure-bearing water-containing medium, the top of the water-bearing layer is covered and compacted by a sealing film to wrap the muddy soil; in the case of a diving aqueous medium, the top of the aquifer is not treated after filling with the aqueous medium.

In step S8, adjusting the parameters of the circulation well means taking the circulation well out of the first mesh outer well, adjusting the distance between the first circulation pipe and the second circulation pipe through the first connection pipe, decreasing the effective length of the first circulation pipe by moving the first plug upward in the first circulation pipe, decreasing the effective length of the second circulation pipe by moving the second plug downward in the second circulation pipe, increasing the effective length of the first circulation pipe by moving the first plug downward in the first circulation pipe, and increasing the effective length of the second circulation pipe by moving the second plug upward in the second circulation pipe, placing the centrifugal pump outside the transparent box or placing the centrifugal pump inside the circulation well, and adjusting the circulation flow rate through the first flow regulator during the operation of the circulation well.

In the step S8, adjusting parameters of the aeration well means taking the aeration well out of the second mesh outer well, moving the fourth choke plug downward in the fourth flow tube to reduce the effective length of the fourth flow tube, moving the fourth choke plug upward in the fourth flow tube to increase the effective length of the fourth flow tube, moving the fourth flow tube upward or downward through the second connecting tube, so that the downward moving position of the fourth flow tube is higher than the lower end of the sealing film of the second mesh outer well, and adjusting the aeration amount through the second flow regulator during the operation of the aeration well.

The length of the first choke plug is longer than that of the first circulating pipe, and the length of the second choke plug is longer than that of the second circulating pipe.

The length of the third choke plug is longer than that of the third circulating pipe, and the length of the fourth choke plug is longer than that of the fourth circulating pipe.

The sampling tube comprises a hard tube section and a hose section, the hose section is connected with the hard tube section, and the valve is fixed on the hose section.

Vertical scale bonds on the front of transparent box, and many vertical scales evenly arrange, and in the sampling tube perpendicular embedding transparent box, many sampling tubes evenly arranged, the spacing distance of two arbitrary rows of adjacent sampling tubes was 8 cm.

The transverse scale is bonded at the lower part of the transparent box body.

The bottom of the transparent box body is provided with a steel frame support used for placing the transparent box body, and the steel frame support is provided with universal wheels.

The pressure measuring pipes are communicated with the transparent box body, and the pressure measuring pipes are uniformly arranged on the back face of the transparent box body.

The first sieve mesh outer well and the second sieve mesh outer well are both open pore pipelines, the diameter of the first sieve mesh outer well is 12cm, and the diameter of the second sieve mesh outer well is 10 cm.

The transparent box is characterized in that a vertical frame with an I-shaped cross section is arranged on one side of the front surface of the transparent box, and a camera used for recording the test process is mounted on the vertical frame.

The beneficial effects of the invention are mainly shown in the following aspects:

1. in the invention, S1, a layer of 120-mesh filter cloth is paved on the inner wall of the periphery of a transparent box body of a test testing device, and a first sieve mesh outer well, a second sieve mesh outer well, a first circulating pipe, a second circulating pipe, a third circulating pipe and a fourth circulating pipe are wrapped by the 120-mesh filter cloth; s2, filling the water-containing medium into a transparent box in batches, and compacting once every 10cm in the process of filling the water-containing medium; s3, after the water-containing medium is filled, erecting a camera to enable the camera shooting frame to be parallel to the boundary of the transparent box body, slowly injecting water into the first tank body, discharging water from the second tank body, and discharging air in the water-containing medium until the water head of the piezometer pipe is stable; s4, injecting pollutants into the aquifer in the transparent box body through the sampling tube; s5, starting the first flow regulator or the second flow regulator, and regulating the flow to enable the circulation well to work until the head of the piezometer pipe is stabilized again; s6, opening a valve on the sampling pipe to obtain water samples of the heterogeneous soil groundwater at different positions for detection and analysis after the water head of the pressure measuring pipe is stabilized again; s7, after the test is finished, watching a video, when a waterhead, solute or non-aqueous phase migration numerical value at a certain moment needs to be read, pausing the video to obtain a waterhead value, a solute or non-aqueous phase vertical diffusion distance value through a numerical value measured by a vertical scale corresponding to a picture recorded by shooting, and obtaining a solute or non-aqueous phase horizontal diffusion distance value through a numerical value measured by a horizontal scale corresponding to the moment; s8, adjusting parameters of a circulation well and parameters of an aeration well, repeating the steps S1-S7 ", compared with the prior art, the method can monitor, record and obtain the head value, solute and non-aqueous phase moving distance in real time, flexibly adjust the parameters of the circulation well and the aeration well, thereby being convenient for exploring the selection of well processes in different homogeneous and heterogeneous soil underground water models, exploring the hydrodynamic flow fields of the circulation well and the aeration well and chemical fields of the solute and the non-aqueous phase in different models, simulating the hydrodynamic field of the circulation well and the aeration well, and having simple and easy operation and strong flexibility of the whole testing method.

2. The invention adopts a first sieve mesh outer well and a second sieve mesh outer well to study the influence of well wall effect on repair, adjusts the distance between a first circulating pipe and a second circulating pipe through a first connecting pipe to be used for studying the influence on the operation of the circulating well, a first flow regulator is used for realizing the regulation of the circulating flow, a second flow regulator is used for regulating the aeration quantity of an aeration well to be used for studying the influence of the water head rule of the aeration well and the aeration quantity on the pollutant removal effect of the aeration well, the distance between an upper circulating pipe and a lower circulating pipe is regulated through a connecting pipe to further realize the regulation of the effective length of the aeration well to study the influence of the relative position of the aeration well and the sieve mesh outer well on the pollutant removal effect of the aeration well, and solute concentrations and non-aqueous phases at different parts in the working range of the whole circulating well and the aeration well can be monitored and sampled through a sampling pipe to simulate the leakage of pollutants, the method is convenient for researching the migration rules of the solute and the non-aqueous phase in the circulation well and the aeration well under the influence of different factors, and as a complete technical scheme, compared with the prior art, the method can flexibly adjust the parameters of the circulation well and the aeration well, thereby being convenient for researching the selection of well processes in different homogeneous and heterogeneous soil and underground water models, researching the hydrodynamic flow fields and the chemical fields of the solute and the non-aqueous phase of the circulation well and the aeration well in different models, and the design parameters of the best removal effect of the wells in different models under different leakage modes of pollutants, and also researching the migration rules of the solute and the non-aqueous phase and the pollutant remediation rules, and simulating the hydrodynamic fields of the circulation well and the aeration well.

3. According to the invention, the length of the first plug is longer than that of the first circulating pipe, and the length of the second plug is longer than that of the second circulating pipe, so that the first circulating pipe and the second circulating pipe can be completely plugged, and the circulation well can be conveniently simulated to run.

4. According to the invention, the length of the third choke plug is longer than that of the third circulating pipe, and the length of the fourth choke plug is longer than that of the fourth circulating pipe, so that the third circulating pipe and the fourth circulating pipe can be completely blocked, and the operation of an aeration well can be conveniently simulated.

5. According to the invention, the sampling pipe comprises the hard pipe section and the soft pipe section, the soft pipe section is connected with the hard pipe section, and the valve is fixed on the soft pipe section, so that the solute concentration and the nonaqueous phase in the working range of the circulation well and the aeration well can be conveniently monitored and sampled, and the sampling is convenient and flexible.

6. According to the invention, the vertical scales are bonded on the front surface of the transparent box body, the vertical scales are uniformly arranged, the sampling tubes are vertically embedded into the transparent box body, the sampling tubes are uniformly arranged, the spacing distance between any two rows of adjacent sampling tubes is 8cm, the solute concentration and the non-aqueous phase at different parts in the working range of the circulation well and the aeration well can be conveniently monitored and sampled, and the numerical value of the vertical diffusion distance of the solute or the non-aqueous phase can be conveniently measured through the uniformly arranged vertical scales.

7. According to the invention, the transverse scale is bonded at the lower part of the transparent box body, so that the numerical value of the solute or non-aqueous phase transverse diffusion distance can be conveniently measured.

8. According to the invention, the bottom of the transparent box body is provided with the steel frame support for placing the transparent box body, the universal wheels are arranged on the steel frame support, the steel frame support can provide good support for the transparent box body, and the whole test equipment can be conveniently moved through the universal wheels.

9. According to the invention, the pressure measuring pipes are communicated with the transparent box body, and the pressure measuring pipes are uniformly arranged on the back surface of the transparent box body, so that water head values of different parts can be measured and obtained, and the influence of the water head rule of the circulation well on the pollutant removal effect of the circulation well and the influence of the water head rule of the aeration well on the pollutant removal effect of the aeration well can be conveniently explored in a follow-up manner.

10. According to the invention, the first sieve mesh outer well and the second sieve mesh outer well are both open pore pipelines, the diameter of the first sieve mesh outer well is 12cm, and the diameter of the second sieve mesh outer well is 10cm, so that the influence of well wall effect on repair can be conveniently researched.

11. According to the invention, the upright frame with the I-shaped cross section is arranged on one side of the front surface of the transparent box body, the camera for recording the test process is arranged on the upright frame, the whole test process can be recorded by the camera, and when the numerical value at a certain moment needs to be read, the water head value, the numerical value of the solute transverse diffusion distance, the numerical value of the longitudinal diffusion distance and the non-aqueous phase movement distance at the moment can be obtained by temporarily stopping recording and corresponding the picture to the numerical values of the transverse scale and the vertical scale through the photographic record.

Drawings

The invention will be further described in detail with reference to the drawings and the detailed description, in which:

FIG. 1 is a front view of a test rig according to the present invention;

FIG. 2 is a rear view of the experimental test setup of the present invention;

FIG. 3 is a schematic view of the structure of the sampling tube of the present invention;

FIG. 4 is a schematic structural view of the stand of the present invention;

the labels in the figure are: 1. transparent box, 2, first flow regulator, 3, second flow regulator, 4, centrifugal pump, 5, aeration pump, 6, intake pipe, 7, the inlet tube, 8, the outlet pipe, 9, the sampling tube, 10, vertical scale, 11, horizontal scale, 12, the valve, 13, the pressure-measuring pipe, 14, first cell body, 15, the second cell body, 16, the first sieve mesh outer well, 17, the second sieve mesh outer well, 18, the first circulation pipe, 19, the first connecting pipe, 20, the second circulation pipe, 21, the first end cap, 22, the second end cap, 23, the third circulation pipe, 24, the second connecting pipe, 25, the fourth circulation pipe, 26, the third end cap, 27, the fourth end cap, 28, the sealing washer, 29, the seal membrane, 30, the hard pipe section, 31, the hose section, 32, the steel frame support, 33, the universal wheel, 34, the grudging post, 35, the camera.

Detailed Description

Example 1

Referring to fig. 1-4, an experimental test method for remediation of heterogeneous soil groundwater includes the steps of:

s1, paving a layer of 120-mesh filter cloth on the inner wall of the periphery of a transparent box body 1 of the test testing device, and wrapping the first sieve mesh outer well 16, the second sieve mesh outer well 17, the first circulating pipe 18, the second circulating pipe 20, the third circulating pipe 23 and the fourth circulating pipe 25 by the 120-mesh filter cloth;

s2, filling the water-containing medium into the transparent box body 1 in batches, and compacting once every 10cm in the process of filling the water-containing medium;

s3, after the water-containing medium is filled, erecting a camera 35 to enable the camera shooting frame to be parallel to the boundary of the transparent box body 1, slowly injecting water into the first tank body 14, discharging water from the second tank body 15, and discharging air in the water-containing medium until the water head of the pressure measuring pipe 13 is stable;

s4, injecting pollutants into the aquifer in the transparent box body 1 through the sampling tube 9;

s5, starting the first flow regulator 2 or the second flow regulator 3, and regulating the flow to enable the circulation well to work until the water head of the piezometer tube 13 is stabilized again;

s6, opening the valve 12 on the sampling pipe 9 to obtain water samples of the heterogeneous soil groundwater at different positions for detection and analysis after the water head of the pressure measuring pipe 13 is stabilized again;

s7, after the test is finished, watching a video, when a water head, solute or non-aqueous phase migration numerical value at a certain moment needs to be read, pausing the video to obtain the water head value, the solute or non-aqueous phase vertical diffusion distance value through the numerical value measured by the vertical scale 10 corresponding to the picture recorded by shooting, and obtaining the solute or non-aqueous phase horizontal diffusion distance value through the numerical value measured by the horizontal scale 11 corresponding to the moment;

In this embodiment, as the most basic implementation manner, S1, a layer of 120-mesh filter cloth is laid on the inner wall around the transparent box 1 of the test device, and the first mesh outer well 16, the second mesh outer well 17, the first circulation pipe 18, the second circulation pipe 20, the third circulation pipe 23, and the fourth circulation pipe 25 are wrapped with the 120-mesh filter cloth; s2, filling the water-containing medium into the transparent box body 1 in batches, and compacting once every 10cm in the process of filling the water-containing medium; s3, after the water-containing medium is filled, erecting a camera 35 to enable the camera shooting frame to be parallel to the boundary of the transparent box body 1, slowly injecting water into the first tank body 14, discharging water from the second tank body 15, and discharging air in the water-containing medium until the water head of the pressure measuring pipe 13 is stable; s4, injecting pollutants into the aquifer in the transparent box body 1 through the sampling tube 9; s5, starting the first flow regulator 2 or the second flow regulator 3, and regulating the flow to enable the circulation well to work until the water head of the piezometer tube 13 is stabilized again; s6, opening the valve 12 on the sampling pipe 9 to obtain water samples of the heterogeneous soil groundwater at different positions for detection and analysis after the water head of the pressure measuring pipe 13 is stabilized again; s7, after the test is finished, watching a video, when a water head, solute or non-aqueous phase migration numerical value at a certain moment needs to be read, pausing the video to obtain the water head value, the solute or non-aqueous phase vertical diffusion distance value through the numerical value measured by the vertical scale 10 corresponding to the picture recorded by shooting, and obtaining the solute or non-aqueous phase horizontal diffusion distance value through the numerical value measured by the horizontal scale 11 corresponding to the moment; s8, adjusting parameters of a circulation well and parameters of an aeration well, repeating the steps S1-S7 ", compared with the prior art, the method can monitor, record and obtain the head value, solute and non-aqueous phase moving distance in real time, flexibly adjust the parameters of the circulation well and the aeration well, thereby being convenient for exploring the selection of well processes in different homogeneous and heterogeneous soil underground water models, exploring the hydrodynamic flow fields of the circulation well and the aeration well and chemical fields of the solute and the non-aqueous phase in different models, simulating the hydrodynamic field of the circulation well and the aeration well, and having simple and easy operation and strong flexibility of the whole testing method.

Example 2

In the step S1, the test testing device includes a transparent box 1, a first flow regulator 2, a second flow regulator 3, a centrifugal pump 4, an aeration pump 5, an air inlet pipe 6, an water inlet pipe 7 and a water outlet pipe 8, the front of the transparent box 1 is provided with a plurality of sampling pipes 9, a plurality of vertical scales 10 and a horizontal scale 11, the sampling pipes 9 are fixed with valves 12, the back of the transparent box 1 is provided with a plurality of pressure measuring pipes 13, one side of the transparent box 1 is provided with a first tank 14 provided with a water inlet, the other side of the transparent box 1 is provided with a second tank 15 provided with a water outlet, the side wall of the transparent box 1 is provided with through holes, the transparent box 1 is respectively communicated with the first tank 14 and the second tank 15, the transparent box 1 is internally fixed with a first sieve mesh outer well 16 and a second sieve mesh outer well 17 communicated with the atmosphere, the first sieve mesh outer well 16 is internally fixed with a circulation well, the circulation well comprises a first circulation pipe 18, a first connecting pipe 19 and a second circulation pipe 20, the upper end of the first circulation pipe 18 is a closed end, the lower end is embedded with a first plug 21, the lower end of the second circulation pipe 20 is a closed end, the upper end is embedded with a second plug 22, a plurality of small holes are uniformly distributed on the first circulation pipe 18 and the second circulation pipe 20, the first circulation pipe 18 is connected with the upper end of the first connecting pipe 19 in a sliding manner, the second circulation pipe 20 is connected with the lower end of the first connecting pipe 19 in a sliding manner, one end of a water inlet pipe 7 is connected with a centrifugal pump 4, the other end of the water inlet pipe 7 is connected with the first circulation pipe 18, one end of a water outlet pipe 8 is connected with a centrifugal pump 4, the other end of the water outlet pipe 8 is connected with the second circulation pipe 20, the centrifugal pump 4 is electrically connected with a first flow regulator 2, an aeration well is arranged in a second sieve mesh outer well 17, the aeration well comprises a third circulation pipe 23, a second connecting pipe 24 and a fourth circulation pipe 25, the upper end of the third circulating pipe 23 is a closed end, the lower end is embedded with a third plug 26, the lower end of the fourth circulating pipe 25 is a closed end, the upper end is embedded with a fourth plug 27, a plurality of small holes are uniformly distributed on the third circulating pipe 23 and the fourth circulating pipe 25, the third circulating pipe 23 is in sliding connection with the upper end of the second connecting pipe 24, a sealing ring 28 is sleeved on the third circulating pipe 23, the sealing ring 28 is fixed on the inner wall of the second sieve mesh outer well 17, the middle part of the second sieve mesh outer well 17 is wrapped with a sealing film 29, the fourth circulating pipe 25 is in sliding connection with the lower end of the second connecting pipe 24, the closed end of the fourth circulating pipe 25 is higher than the lower end of the sealing film 29, one end of the air inlet pipe 6 is connected with the aeration pump 5, the other end of the air inlet pipe 6 is connected with the fourth circulating pipe 25, and the aeration pump 5 is electrically connected with the second flow regulator 3.

The embodiment is a preferred embodiment, the first mesh outer well 16 and the second mesh outer well 17 can be used for researching the influence of well wall effect on repairing, the distance between the first circulating pipe 18 and the second circulating pipe 20 is adjusted through the first connecting pipe 19, the influence on the operation of the circulating well can be researched, the first flow regulator 2 is used for realizing the flow regulation of the ring, the aeration quantity of the aeration well is adjusted through the second flow regulator 3, the water head rule of the aeration well and the influence of the aeration quantity on the pollutant removing effect of the aeration well can be researched, the distance between the upper circulating pipe and the lower circulating pipe is adjusted through the connecting pipe, the effective length of the aeration well is further adjusted, the influence on the pollutant removing effect of the aeration well by the relative position of the aeration well and the mesh outer well is researched, solute concentration and nonaqueous phase at different parts in the working range of the whole circulating well and the aeration well can be monitored and sampled and the leakage of pollutants can be simulated through the sampling pipe 9, the method is convenient for researching the migration rules of the solute and the non-aqueous phase in the circulation well and the aeration well under the influence of different factors, and as a complete technical scheme, compared with the prior art, the method can flexibly adjust the parameters of the circulation well and the aeration well, thereby being convenient for researching the selection of well processes in different homogeneous and heterogeneous soil and underground water models, researching the hydrodynamic flow fields and the chemical fields of the solute and the non-aqueous phase of the circulation well and the aeration well in different models, and the design parameters of the best removal effect of the wells in different models under different leakage modes of pollutants, and also researching the migration rules of the solute and the non-aqueous phase and the pollutant remediation rules, and simulating the hydrodynamic fields of the circulation well and the aeration well.

Example 3

In the step S2, the aqueous medium is a homogeneous aqueous medium, a non-homogeneous aqueous medium, a pressure-bearing aqueous medium or a diving aqueous medium, and when the aqueous medium is a homogeneous aqueous medium, the transparent box 1 is filled with a material medium, and the material medium is compacted once every 10cm to simulate the homogeneous aqueous medium; when the lens is a heterogeneous aqueous medium, different materials are filled in each layer or muddy soil wrapped by a sealing film 29 is put into the lens body; when the water-bearing medium is a pressure-bearing water-containing medium, the top of the water-bearing layer is covered and compacted by a sealing film 29 to wrap the muddy soil; in the case of a diving aqueous medium, the top of the aquifer is not treated after filling with the aqueous medium.

In step S8, adjusting the parameters of the circulation well means taking the circulation well out of the first mesh outer well 16, adjusting the distance between the first circulation pipe 18 and the second circulation pipe 20 through the first connecting pipe 19, decreasing the effective length of the first circulation pipe 18 by moving the first plug 21 upward in the first circulation pipe 18, decreasing the effective length of the second circulation pipe 20 by moving the second plug 22 downward in the second circulation pipe 20, increasing the effective length of the first circulation pipe 18 by moving the first plug 21 downward in the first circulation pipe 18, and increasing the effective length of the second circulation pipe 20 by moving the second plug 22 upward in the second circulation pipe 20, placing the centrifugal pump 4 outside the transparent box 1 or placing the centrifugal pump 4 in the circulation well, and adjusting the circulation flow rate through the first flow rate adjuster 2 during the circulation well operation.

In the step S8, adjusting parameters of the aeration well means taking the aeration well out of the second mesh outer well 17, moving the fourth choke plug 27 downward in the fourth flow pipe 25 to reduce the effective length of the fourth flow pipe 25, moving the fourth choke plug 27 upward in the fourth flow pipe 25 to increase the effective length of the fourth flow pipe 25, moving the fourth flow pipe 25 upward or downward through the second connecting pipe 24 to make the downward moving position of the fourth flow pipe 25 higher than the lower end of the sealing film 29 of the second mesh outer well 17, and adjusting the aeration amount through the second flow regulator 3 during the operation of the aeration well.

The first plug 21 is longer than the first circulation pipe 18, and the second plug 22 is longer than the second circulation pipe 20.

The third plug 26 is longer than the third circulation pipe 23, and the fourth plug 27 is longer than the fourth circulation pipe 25.

In this embodiment, the length of the first plug 21 is longer than that of the first circulation pipe 18, and the length of the second plug 22 is longer than that of the second circulation pipe 20, so that the first circulation pipe 18 and the second circulation pipe 20 can be completely plugged, and circulation well operation can be simulated.

The length of the third choke plug 26 is longer than that of the third circulation pipe 23, and the length of the fourth choke plug 27 is longer than that of the fourth circulation pipe 25, so that the third circulation pipe 23 and the fourth circulation pipe 25 can be completely plugged, and the operation of an aeration well can be simulated conveniently.

Example 4

The sampling tube 9 comprises a hard tube section 30 and a flexible tube section 31, the flexible tube section 31 is connected to the hard tube section 30, and the valve 12 is fixed to the flexible tube section 31.

Vertical scale 10 bonds on the front of transparent box 1, and many vertical scales 10 evenly arrange, and in the transparent box 1 of the perpendicular embedding of sampling tube 9, many sampling tubes 9 evenly arranged, the spacing distance of two arbitrary rows of adjacent sampling tubes 9 was 8 cm.

The horizontal scale 11 is adhered to the lower part of the transparent box 1.

In this embodiment, the sampling tube 9 comprises a hard tube section 30 and a flexible tube section 31, the flexible tube section 31 is connected to the hard tube section 30, and the valve 12 is fixed on the flexible tube section 31, so as to facilitate the monitoring and sampling of the solute concentration and the non-aqueous phase in the working range of the circulation well and the aeration well, and the sampling is convenient and flexible.

Vertical scale 10 bonds on transparent box 1's front, many vertical scales 10 evenly arrange, in the transparent box 1 of sampling tube 9 perpendicular embedding, many sampling tubes 9 evenly arrange, the spacing distance of arbitrary two rows of adjacent sampling tubes 9 is 8cm, be convenient for monitor the sample to the solute concentration and the non-aqueous phase at different positions in circulation well and aeration well working range, through many vertical scales 10 of evenly arranging, be convenient for survey the numerical value of solute or non-aqueous phase vertical diffusion distance.

The transverse scale 11 is adhered to the lower part of the transparent box 1, so as to be convenient for measuring the value of the transverse diffusion distance of the solute or the non-aqueous phase.

Example 5

The horizontal scale 11 is adhered to the lower part of the transparent box 1.

The bottom of the transparent box body 1 is provided with a steel frame support 32 for placing the transparent box body 1, and the steel frame support 32 is provided with universal wheels 33.

The pressure measuring pipes 13 are communicated with the transparent box body 1, and the pressure measuring pipes 13 are evenly arranged on the back face of the transparent box body 1.

The first sieve mesh outer well 16 and the second sieve mesh outer well 17 are both open-pore pipelines, the diameter of the first sieve mesh outer well 16 is 12cm, and the diameter of the second sieve mesh outer well 17 is 10 cm.

A vertical frame 34 with an I-shaped cross section is arranged on one side of the front face of the transparent box body 1, and a camera 35 used for recording the test process is mounted on the vertical frame 34.

The embodiment is the best mode, and the bottom of transparent box 1 is provided with the steelframe support 32 that is used for placing transparent box 1, installs universal wheel 33 on the steelframe support 32, and steelframe support 32 can provide good support for transparent box 1, the whole experimental test equipment of removal that can be convenient through universal wheel 33.

The pressure measuring pipes 13 are communicated with the transparent box body 1, and the pressure measuring pipes 13 are uniformly arranged on the back surface of the transparent box body 1, so that water head values of different parts can be measured and obtained, and the influence of the water head rule of the circulation well on the pollutant removal effect of the circulation well and the influence of the water head rule of the aeration well on the pollutant removal effect of the aeration well can be conveniently and subsequently explored.

The outer well 16 of first sieve mesh and the outer well 17 of second sieve mesh are the trompil pipeline, and the diameter of the outer well 16 of first sieve mesh is 12cm, and the diameter of the outer well 17 of second sieve mesh is 10cm, is convenient for study the influence of the wall of a well effect on restoration.

The vertical frame 34 with the cross section shaped like the Chinese character 'I' is arranged on one side of the front face of the transparent box body 1, the camera 35 used for recording the test process is installed on the vertical frame 34, the whole test process can be recorded by arranging the camera 35, when the numerical value at a certain moment needs to be read, the water head value, the numerical value of the solute transverse diffusion distance, the numerical value of the longitudinal diffusion distance and the non-aqueous phase movement distance at the moment can be obtained by temporarily stopping recording and corresponding the numerical values of the transverse scale 11 and the vertical scale 10 to the picture recorded by shooting.

The circulation well works as follows:

the method comprises the steps of installing a waterproof material in a transparent box body 1, separating the transparent box body 1 into a waterproof layer and a water-bearing layer, opening a centrifugal pump 4, then pumping water through a first circulating pipe 18 to generate suction force, pumping the water in the transparent box body 1 into a first sieve mesh outer well 16, entering the first circulating pipe 18, passing through the centrifugal pump 4, entering a second circulating pipe 20 through a water outlet pipe 8, finally discharging the water out of the first sieve mesh outer well 16, and entering the transparent box body 1, so that circulation is formed in the water-bearing layer.

The working process of the aeration well is as follows:

install water-stop material in transparent box 1, separate into water barrier and aquifer with transparent box 1, aeration pump 5 opens the back, gaseous through intake pipe 6 entering fourth ring flow tube 25, produce a large amount of gas in second sieve mesh outer well 17, after fourth ring flow tube 25 produced a large amount of gas, can have density difference with the outside aquifer of second sieve mesh outer well 17, second sieve mesh outer well 17 is inside to produce the negative pressure, and then make the water in the outside aquifer of second sieve mesh outer well 17 get into in second sieve mesh outer well 17, later water and gas mixture rise to sealing washer 28 position, get into the aquifer again through the sieve mesh on the second sieve mesh outer well 17 below sealing washer 28, from this form the hydrologic cycle in the aquifer, and the gas in the aquifer gathers behind the aquifer top in a large number, can get into second sieve mesh outer well 17 through the sieve mesh on the second sieve mesh outer well 17 above sealing washer 28, since the top of the second mesh outer well 17 is open to the atmosphere, eventually the gas escapes into the atmosphere.

The process of simulating contaminant leakage is as follows:

the leakage position: selecting a corresponding sampling tube 9 or the top of the heterogeneous soil groundwater as required, and injecting the medicament into the transparent box body 1 through the sampling tube 9 by an injector; leakage mode: in the process of injecting the pollutants, the injection frequency is adjusted, and continuous injection is adopted for a long time; or instantaneous, one-time short-time injection; or interval type, and injection mode of injecting once at intervals.

The sampling tube 9 can simulate the leakage of pollutants in different forms of a continuous pollution source, an instantaneous pollution source or an intermittent pollution source at different positions in the heterogeneous soil underground water, and can also be used for exploring the selection of a well process and the determination of the most appropriate parameters of the well process when the pollutants are leaked in different forms at different positions in the heterogeneous soil underground water.

Claims

1. An experimental test method for repairing heterogeneous soil groundwater, comprising the steps of:

s1, paving a layer of 120-mesh filter cloth on the inner wall of the periphery of a transparent box body (1) of the test testing device, and wrapping a first sieve mesh outer well (16), a second sieve mesh outer well (17), a first circulating pipe (18), a second circulating pipe (20), a third circulating pipe (23) and a fourth circulating pipe (25) by using the 120-mesh filter cloth;

s2, filling the water-containing medium into the transparent box body (1) in batches, and compacting once per 10cm in the process of filling the water-containing medium;

s3, after the water-containing medium is filled, erecting a camera (35) to enable a camera shooting frame to be parallel to the boundary of the transparent box body (1), slowly injecting water into the first tank body (14), discharging water from the second tank body (15), and discharging air in the water-containing medium until the water head of the pressure measuring pipe (13) is stable;

s4, injecting pollutants into the aquifer in the transparent box body (1) through the sampling tube (9);

s5, starting the first flow regulator (2) or the second flow regulator (3), and regulating the flow to enable the circulation well to work until the water head of the pressure measuring pipe (13) is stabilized again;

s6, opening a valve (12) on the sampling pipe (9) to obtain water samples of heterogeneous soil groundwater at different positions for detection and analysis after the water head of the pressure measuring pipe (13) is stabilized again;

s7, after the test is finished, watching a video, when a water head, solute or non-aqueous phase migration numerical value at a certain moment needs to be read, pausing the video to obtain the water head value, the solute or non-aqueous phase vertical diffusion distance value through the numerical value measured by the vertical scale (10) corresponding to the picture recorded by shooting, and obtaining the solute or non-aqueous phase horizontal diffusion distance value through the numerical value measured by the horizontal scale (11) corresponding to the moment;

2. The test method of claim 1, wherein said method comprises the steps of: in the step S1, the test testing device comprises a transparent box body (1), a first flow regulator (2), a second flow regulator (3), a centrifugal pump (4), an aeration pump (5), an air inlet pipe (6), an water inlet pipe (7) and a water outlet pipe (8), wherein a plurality of sampling pipes (9), a plurality of vertical scales (10) and a transverse scale (11) are arranged on the front surface of the transparent box body (1), valves (12) are fixed on the sampling pipes (9), a plurality of pressure measuring pipes (13) are arranged on the back surface of the transparent box body (1), a first groove body (14) provided with a water inlet is arranged on one side of the transparent box body (1), a second groove body (15) provided with a water outlet is arranged on the other side of the transparent box body (1), through holes are formed in the side wall of the transparent box body (1), the transparent box body (1) is respectively communicated with the first groove body (14) and the, a first sieve mesh outer well (16) and a second sieve mesh outer well (17) communicated with the atmosphere are fixed in the transparent box body (1), a circulation well is fixed in the first sieve mesh outer well (16), the circulation well comprises a first circulation pipe (18), a first connecting pipe (19) and a second circulation pipe (20), the upper end of the first circulation pipe (18) is a closed end, the lower end of the first circulation pipe is embedded with a first plug (21), the lower end of the second circulation pipe (20) is a closed end, the upper end of the second circulation pipe is embedded with a second plug (22), a plurality of small holes are uniformly distributed on the first circulation pipe (18) and the second circulation pipe (20), the first circulation pipe (18) is in sliding connection with the upper end of the first connecting pipe (19), the second circulation pipe (20) is in sliding connection with the lower end of the first connecting pipe (19), one end of the water inlet pipe (7) is connected with the centrifugal pump (4), and the other end of the water inlet pipe (7) is connected with the first circulation pipe (18), one end of a water outlet pipe (8) is connected with a centrifugal pump (4), the other end of the water outlet pipe (8) is connected with a second circulating pipe (20), the centrifugal pump (4) is electrically connected with a first flow regulator (2), an aeration well is arranged in a second sieve mesh outer well (17), the aeration well comprises a third circulating pipe (23), a second connecting pipe (24) and a fourth circulating pipe (25), the upper end of the third circulating pipe (23) is a closed end, a third plug (26) is embedded at the lower end, the lower end of the fourth circulating pipe (25) is a closed end, a fourth plug (27) is embedded at the upper end, a plurality of small holes are uniformly distributed on the third circulating pipe (23) and the fourth circulating pipe (25), the third circulating pipe (23) is connected with the upper end of the second connecting pipe (24) in a sliding manner, a sealing ring (28) is sleeved on the third circulating pipe (23), the sealing ring (28) is fixed on the inner wall of the second sieve mesh outer well (17), the middle part parcel of second sieve mesh outer well (17) has seal membrane (29), fourth circulation pipe (25) and the lower extreme sliding connection of second connecting pipe (24), the blind end of fourth circulation pipe (25) is higher than the lower extreme of seal membrane (29), the one end and the aeration pump (5) of intake pipe (6) are connected, the other end and the fourth circulation pipe (25) of intake pipe (6) are connected, aeration pump (5) are connected with second flow regulator (3) electricity.

3. The test method of claim 2, wherein said method comprises the steps of: in the step S2, the water-containing medium is a homogeneous water-containing medium, a non-homogeneous water-containing medium, a pressure-bearing water-containing medium or a diving water-containing medium, when the water-containing medium is the homogeneous water-containing medium, the interior of the transparent box body (1) is filled with a material medium, and the material medium is compacted once every 10cm to simulate the homogeneous water-containing medium; when the lens is a heterogeneous aqueous medium, filling different materials in each layer or putting muddy soil wrapped by a sealing film (29) into the lens body; when the water-bearing medium is a pressure-bearing water-containing medium, the top of the water-bearing layer is covered and compacted by a sealing film (29) to wrap the muddy soil; in the case of a diving aqueous medium, the top of the aquifer is not treated after filling with the aqueous medium.

4. The test method of claim 2, wherein said method comprises the steps of: in the step S8, adjusting the parameters of the circulation well means taking the circulation well out of the first mesh outer well (16), adjusting the distance between the first circulation pipe (18) and the second circulation pipe (20) through the first connecting pipe (19), reducing the effective length of the first circulation pipe (18) by moving the first plug (21) upwards in the first circulation pipe (18), reducing the effective length of the second circulation pipe (20) by moving the second plug (22) downwards in the second circulation pipe (20), increasing the effective length of the first circulation pipe (18) by moving the first plug (21) downwards in the first circulation pipe (18), increasing the effective length of the second circulation pipe (20) by moving the second plug (22) upwards in the second circulation pipe (20), placing the centrifugal pump (4) outside the transparent box (1) or placing the centrifugal pump (4) in the circulation well, the circulation flow is adjusted by the first flow regulator (2) during the operation of the circulation well.

5. The test method of claim 2, wherein said method comprises the steps of: in the step S8, adjusting parameters of the aeration well means taking the aeration well out of the second mesh outer well (17), moving the fourth choke plug (27) downward in the fourth flow pipe (25) to reduce the effective length of the fourth flow pipe (25), moving the fourth choke plug (27) upward in the fourth flow pipe (25) to increase the effective length of the fourth flow pipe (25), moving the fourth flow pipe (25) upward or downward through the second connecting pipe (24), making the downward moving position of the fourth flow pipe (25) higher than the lower end of the sealing film (29) of the second mesh outer well (17), and adjusting the aeration amount through the second flow regulator (3) during the operation of the aeration well.

6. The test method of claim 2, wherein said method comprises the steps of: the length of the first plug (21) is longer than that of the first circulating pipe (18), and the length of the second plug (22) is longer than that of the second circulating pipe (20).

7. The test method of claim 2, wherein said method comprises the steps of: the third plug (26) is longer than the third circulating pipe (23), and the fourth plug (27) is longer than the fourth circulating pipe (25).

8. The test method of claim 2, wherein said method comprises the steps of: the sampling tube (9) comprises a hard tube section (30) and a hose section (31), the hose section (31) is connected with the hard tube section (30), and the valve (12) is fixed on the hose section (31).

9. The test method of claim 2, wherein said method comprises the steps of: vertical scale (10) bond on the front of transparent box (1), and many vertical scales (10) are evenly arranged, and in sampling tube (9) embedded transparent box (1) perpendicularly, many sampling tubes (9) evenly arranged, the interval distance of two arbitrary rows of adjacent sampling tubes (9) was 8 cm.

10. The test method of claim 2, wherein said method comprises the steps of: the transverse scale (11) is adhered to the lower part of the transparent box body (1).