CN113466106A - Testing device and method for seepage-proofing and pollution-controlling performance test of impervious wall - Google Patents
Testing device and method for seepage-proofing and pollution-controlling performance test of impervious wall Download PDFInfo
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- 230000005012 migration Effects 0.000 claims abstract description 10
- 210000000416 exudates and transudate Anatomy 0.000 claims abstract description 6
- 238000000429 assembly Methods 0.000 claims abstract description 3
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- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention relates to a test device and a method for testing the seepage-proofing and pollution-controlling performance of a diaphragm wall, wherein the device comprises a constant-pressure variable-frequency speed-regulating liquid supply system, a test box and a sampling assembly; an impervious wall is placed in the test box, and an underground material is filled between the outer wall of the impervious wall and the inner wall of the test box; the bottom of the test box is provided with a seepage pipe and a clean water pipe, the seepage pipe is positioned on the inner side of the impervious wall, and the clean water pipe is positioned between the outer wall of the impervious wall and the inner wall of the test box; the constant-pressure variable-frequency speed-regulating liquid supply system is used for introducing clean water or seepage liquid into the test box; the sampling assemblies are distributed at different positions of the impervious wall and used for collecting exudates. The method provides possibility for developing an indoor test for simulating the migration of the pollutants of the impervious wall, can research the migration condition of the pollutants in the wall under different conditions and multiple factors, and tests the seepage-proofing and pollution-controlling effect of the wall, rather than using the hydraulic performance of the wall as a unique index for evaluating whether the impervious wall is suitable for a certain polluted site.
Description
Technical Field
The invention belongs to the technical field of research on migration rules of pollutants in refuse landfills and research on seepage prevention and pollution control of pollutants, and particularly relates to a test device and a method for testing seepage prevention and pollution control performance of a seepage-proof wall, which are suitable for testing seepage prevention and pollution control performance of various seepage-proof walls in environmental geotechnical treatment engineering, in particular to an indoor test for testing seepage prevention and pollution control performance of walls under the influence of factors such as osmotic pressure, wall thickness, mixed liquid of various pollutants, different wall materials, different seepage-proof walls and the like.
Background
The investigation result shows that about 27 percent of the existing landfill sites in China do not adopt any anti-seepage pollution control measures. As the landfill garbage is fermented and soaked by rainwater or underground water, a large amount of high-concentration organic percolate can be generated, and great potential safety hazard is brought to the underground water or the surrounding environment of the garbage landfill. At present, the main treatment measure of the refuse landfill or the polluted site is to arrange a vertical impervious wall at the periphery of the landfill or at the downstream position of underground water, so that a pollution source can be effectively isolated, a pollution path is cut off, the aim of preventing the pollution of the underground water is fulfilled, and the seepage-proofing and pollution-controlling performance of the impervious wall directly determines the treatment quality of the refuse landfill.
In the prior art, no industry specification and equipment are provided for testing the impervious wall in a landfill or a polluted site, particularly for composite impervious walls such as geomembrane composite vertical impervious walls, GCL composite vertical impervious walls and the like. A method for detecting the hydraulic index (permeability coefficient) of a wall body by a core drilling sampling and placing mode is disclosed in the literature 'impervious wall undisturbed core sample drilling research' (see Zhengyong, Xiejing is river, Gaojiang forest, impervious wall undisturbed core sample drilling research [ J ]. water conservancy planning and design, 2019(01): 77-79.). The document entitled "test for permeation and diffusion coefficient of filler for soil-bentonite diaphragm wall under low consolidation pressure" (see: Zhang Wenje, morning, dawn Red. test for permeation and diffusion coefficient of filler for soil-bentonite diaphragm wall under low consolidation pressure [ J. report on geotechnical engineering, 2017,39(10):1915 and 1921.) discloses the use of a flexible wall permeameter to detect the migration of leachate in the diaphragm wall. The two methods mainly measure the permeability coefficient of the wall material, are far from the actual working condition of a landfill site, and have the problems of inconvenient sampling and the like because field experiments need to be carried out for field sampling.
Therefore, the invention provides a test device and a method for testing the seepage-proofing and pollution-controlling performance of the impervious wall, which are mainly used for testing the seepage-proofing and pollution-controlling performance of the wall under different conditions, and fill the blank of the seepage-proofing and pollution-controlling performance test for the vertical impervious wall of the hazardous waste site.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing a test device and a method for the seepage-proofing and pollution-controlling performance test of the seepage-proofing wall.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a test device for testing the seepage-proofing and pollution-controlling performance of a seepage-proofing wall is characterized by comprising a constant-pressure variable-frequency speed-regulating liquid supply system, a test box and a sampling assembly;
an impervious wall is placed in the test box, and an underground material is filled between the outer wall of the impervious wall and the inner wall of the test box; the bottom of the test box is provided with a seepage pipe and a clean water pipe, the seepage pipe is positioned on the inner side of the impervious wall, and the clean water pipe is positioned between the outer wall of the impervious wall and the inner wall of the test box;
the constant-pressure variable-frequency speed-regulating liquid supply system is used for introducing clean water or seepage liquid into the test box;
the sampling assemblies are distributed at different positions of the impervious wall and used for collecting exudates.
The constant-pressure variable-frequency speed-regulating water supply system comprises a separated water tank, a multi-stage water pump, a pressure stabilizing tank, a pressure transmitter, a flowmeter and a variable-frequency control module;
the separated water tank is provided with a clear water cavity and an organic liquid cavity, and the lower parts of the two cavities are respectively provided with a second water drain valve; the upper part of the clear water cavity and the upper part of the organic liquid cavity are both connected with an external water supply end, the lower part of the clear water cavity is connected with the input end of a multistage water pump through a clear water valve and the lower part of the organic liquid cavity is connected with the input end of an organic liquid valve, the output end of the multistage water pump is connected with the input end of a pressure stabilizing tank, and the output end of the pressure stabilizing tank is connected with a liquid inlet pipe through a main pipeline and is connected with a clear water pipe through an auxiliary pipeline; the flowmeter is installed on the main pipeline, pressure transmitter is installed on the infiltration pipe, and multistage water pump, surge tank, pressure transmitter and flowmeter all are connected with frequency conversion control module.
A water tank partition board is arranged in the separated water tank, and an inner cavity of the separated water tank is divided into a clear water cavity and an organic liquid cavity; the top of the organic liquid cavity is provided with a medicine feeding port and a stirring motor, and an output shaft of the stirring motor is connected with an impeller.
A first water drain valve and a gate valve are arranged on a pipeline between the separated water tank and the multi-stage water pump, a pipeline between the multi-stage water pump and the pressure stabilizing tank and an auxiliary pipeline; a first water drain valve is arranged on the main pipeline; a first check valve is further arranged on a pipeline between the multi-stage water pump and the pressure stabilizing tank, and a second check valve and a pressure regulating valve are further arranged on the auxiliary pipeline.
And the top plate of the test box is provided with two automatic exhaust valves and one safety relief valve, the safety relief valve and the automatic exhaust valve are positioned between the inner wall of the test box and the outer wall of the impervious wall, and the other automatic exhaust valve is positioned on the inner side of the impervious wall.
The device also comprises a cylindrical die.
The test box is a hollow box body, and the lower surface of the top plate of the test box is provided with a boss inserted in the hollow part of the impervious wall; the bottom plate of the test box is provided with a disc, so that a groove is formed around the bottom plate of the test box.
The sampling assembly comprises a percolate collecting pipe, a guide pipe, a collector, a filter screen and a stop valve; the seepage collecting pipe is embedded in the impervious wall, one end of the seepage collecting pipe does not penetrate through the inner wall of the impervious wall, and the other end of the seepage collecting pipe extends out of the outer wall of the impervious wall; one end of the guide pipe penetrates through the side wall of the test box and is connected with one end of the percolate collecting pipe extending out of the impervious wall; the other end of the conduit is connected with a collector, and the conduit is provided with a filter screen and a stop valve.
A test method for testing the seepage-proofing and pollution-controlling performance of a seepage-proofing wall is characterized by comprising the following steps of:
firstly, pouring and saturation of the impervious wall: placing a mould in a test box, placing a vertical pipeline on the inner side of the mould, and coating release agents on the outer wall of the vertical pipeline and the inner wall of the mould; embedding percolate collecting pipes at different positions of the impervious wall according to test requirements, pouring between the outer wall of the vertical pipeline and the inner wall of the mold, demolding after curing, pulling out the vertical pipeline, and pouring to obtain a hollow cylindrical impervious wall; filling an underground material between the outer wall of the impervious wall and the inner wall of the test box, and covering a top plate of the test box after compacting;
closing a second water discharge valve of the separated water tank and all first water discharge valves in the pipeline, opening a clear water valve and all gate valves, starting the multi-stage water pump, and filling clear water into the inner side and the outer side of the impervious wall through the main pipeline and the auxiliary pipeline; manually adjusting the pressure regulating valve to enable the inner side and the outer side of the impervious wall to form pressure difference, and when clear water is discharged from the safety relief valve, indicating that the saturation treatment is finished; then closing the clean water valve, the multi-stage water pump and all gate valves, opening all first water drain valves, discharging the clean water in each pipeline and the test box, and closing all first water drain valves after the clean water is completely discharged; dismantling the safety relief valve, and installing a drain pipe at the position where the safety relief valve is installed;
secondly, preparing seepage: adding medicines and clear water into an organic liquid cavity of the separated water tank, preparing infiltration liquid with a certain concentration according to test requirements, and measuring the initial concentration of the infiltration liquid through a second water drain valve at the lower part of the organic liquid cavity;
opening a gate valve on an organic liquid valve, a multi-stage water pump, a pipeline between a separated water tank and the multi-stage water pump and a gate valve on a pipeline between the multi-stage water pump and a pressure stabilizing tank, adding and injecting seepage liquid into the hollow part of the impervious wall through a main pipeline, enabling the seepage liquid to permeate from the inner side of the impervious wall to the inner part of the wall body, and stopping adding and injecting the seepage liquid when each sampling assembly on the impervious wall can collect the seepage liquid; the migration situation of the seepage entering liquid in the seepage-proofing wall is simulated by measuring the concentration of the seepage at different positions of the seepage-proofing wall.
In the method, one or more variables of osmotic pressure, pollutant types, the thickness of the impervious wall and the type of the impervious wall are changed to test the seepage-proofing and pollution-controlling performance of the impervious wall under different test conditions.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides possibility for developing an indoor test for simulating the migration of the pollutants of the impervious wall, can research the migration condition of the pollutants in the interior of the impervious wall under different conditions, tests the seepage-proofing and pollution-controlling effect of the wall, does not use the hydraulic performance of the wall as the only index for evaluating whether the impervious wall is suitable for a certain polluted site, and can develop a test for influencing the seepage-proofing and pollution-controlling performance of the wall by multiple factors. For the composite impervious wall, the seepage-proofing and pollution-controlling performance of the composite impervious wall can be tested, the seepage-proofing and pollution-controlling effect of the lap joint part can also be tested, the blank of a seepage-proofing and pollution-controlling performance testing means of the composite impervious wall is filled, and the defect that core drilling sampling is not matched with the composite impervious wall in the prior art is overcome.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the installation of the sampling assembly of the present invention with a test chamber;
fig. 3 is a schematic diagram of the structure of the sampling assembly of the present invention.
FIG. 4 is a front view of the mold of the present invention;
wherein, 1-constant pressure variable frequency speed control liquid supply system; 2-test chamber; 3-a sampling component;
11-a divided water tank; 12-a multi-stage water pump; 13-a surge tank; 14-a pressure transmitter; 15-a flow meter; 16-a variable frequency control module; 17-a butterfly valve; 18-a clean water valve; 19-organic liquid valve; 110-a drain valve; 111-second drain valve; 112-check valve number one; 113-check valve No. two; 114-a pressure regulating valve; 115-gate valve;
21-a liquid inlet pipe; 22-a clean water pipe; 23-a boss; 24-a groove; 25-a safety relief valve; 26-automatic exhaust valve;
31-percolate collecting tube; 32-a catheter; 33-a collector; 34-a filter screen; 35-a stop valve;
11-1, a water tank partition plate; 11-2, administration port; 11-3, a stirring motor; 11-4 and an impeller.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and the detailed description, and the scope of the present invention is not limited thereby.
The invention relates to a test device (a device for short, see figures 1-4) for testing the seepage-proofing and pollution-controlling performance of a diaphragm wall, which comprises a constant-pressure variable-frequency speed-regulating liquid supply system 1, a test box 2 and a sampling assembly 3;
an impervious wall for testing is placed in the test box 2, and buried materials such as soil and sand are filled between the outer wall of the impervious wall and the inner wall of the test box 2; the bottom of the test box 2 is provided with a seepage pipe 21 and a clear water pipe 22, and the seepage pipe 21 is positioned on the inner side of the impervious wall and is used for injecting seepage into the test box 2; the clean water pipe 22 is positioned between the outer wall of the impervious wall and the inner wall of the test box 2 and is used for filling clean water into the test box 2 in the initial stage of the test and carrying out saturation treatment on the impervious wall;
the constant-pressure variable-frequency speed-regulating liquid supply system 1 comprises a separated water tank 11, a multi-stage water pump 12, a pressure stabilizing tank 13, a pressure transmitter 14, a flowmeter 15 and a variable-frequency control module 16;
the separated water tank 11 is provided with a clear water cavity and an organic liquid cavity, the upper part of the clear water cavity and the upper part of the organic liquid cavity are respectively connected with an external water supply end through a butterfly valve 17, the lower part of the clear water cavity is connected with the input end of the multi-stage water pump 12 through a clear water valve 18 and the lower part of the organic liquid cavity is connected with the input end of the multi-stage water pump 12 through an organic liquid valve 19, the output end of the multi-stage water pump 12 is connected with the input end of the surge tank 13, and the output end of the surge tank 13 is connected with the infiltration liquid pipe 21 through a main pipeline and is connected with a clear water pipe 22 through a secondary pipeline; the flowmeter 15 is arranged on the main pipeline and used for recording the dosage of the seepage; the pressure transmitter 14 is installed on the infiltration liquid pipe 21 and used for detecting the water pressure; the multistage water pump 12, the pressure stabilizing tank 13, the pressure transmitter 14 and the flowmeter 15 are all connected with the variable frequency control module 16;
the pressure transmitter 14 measures the water pressure in the main pipeline in real time, and when the water pressure is lower than the preset osmotic pressure, the variable frequency control module 16 sends a control signal to increase the rotating speed of the multi-stage water pump 12 so as to increase the water pressure in the surge tank 13; when the water pressure in the surge tank 13 reaches the preset osmotic pressure, the multi-stage water pump 12 stops working, and the circulation is performed, so that the water pressure in the surge tank 13 is always kept at the preset osmotic pressure;
the sampling assembly 3 is used for collecting the exudate of the impervious wall.
A first drain valve 110 and a gate valve 115 are arranged on a pipeline between the separated water tank 11 and the multi-stage water pump 12, a pipeline between the multi-stage water pump 12 and the surge tank 13 and an auxiliary pipeline, the gate valves 115 are used for opening and closing the pipelines, and the first drain valve 110 is used for draining water in the pipelines; a first water release valve 110 is also arranged on the main pipeline. A first check valve 112 is further arranged on the pipeline between the multistage water pump 12 and the pressure stabilizing tank 13 and is used for preventing water in the pipeline from flowing backwards and damaging the multistage water pump 12; the secondary pipeline is also provided with a second check valve 113 and a pressure regulating valve 114, and the second check valve 113 is used for preventing clear water in the secondary pipeline from flowing backwards into the main pipeline to pollute seepage in the main pipeline; the pressure regulating valve 114 is used for regulating the water pressure of the diaphragm wall during saturation treatment, so that the pressure difference is formed between the inner side and the outer side of the diaphragm wall.
The sampling assembly 3 comprises a percolate collecting pipe 31, a guide pipe 32, a collector 33, a filter screen 34 and a stop valve 35, wherein the percolate collecting pipe 31 is embedded in the impervious wall, one end of the percolate collecting pipe 31 does not penetrate through the inner wall of the impervious wall, and the other end of the percolate collecting pipe extends out of the outer wall of the impervious wall; one end of the conduit 32 penetrates through the side wall of the test box 2 and is connected with one end of the percolate collecting pipe 31 extending out of the impervious wall through a hose and a hose, and the position of the conduit 32 penetrating through the side wall of the test box 2 is sealed through glass cement; the other end of the conduit 32 is connected with a collector 33, and a filter screen 34 and a stop valve 35 are arranged on the conduit 32; the seepage liquid in the seepage liquid collecting pipe 31 is sucked out through the collector 33, and the stop valve 35 is closed to prevent the seepage liquid from flowing outwards after the sampling is finished.
The device also comprises a cylindrical mold 4 for pouring the impervious wall, wherein the mold is cylindrical in the embodiment and is vertically placed in a groove 24 of a bottom plate of the test box 2, a vertical pipeline is placed on the inner side of the mold, release agents are coated on the outer wall of the vertical pipeline and the inner wall of the mold 4, and impervious wall pouring materials are filled between the outer wall of the vertical pipeline and the inner wall of the mold to finish pouring of the impervious wall; when pouring, the percolate collecting pipe 31 of the sampling assembly 3 is embedded according to the test requirement, so that the percolate collecting pipe 31 is arranged at different positions of the impervious wall; and (3) taking out the mold 4 and the vertical pipeline after the impervious wall is solidified, wherein the impervious wall is a hollow cylinder, and the seepage liquid enters the hollow part of the impervious wall through the seepage liquid inlet pipe 21 and seeps from the inner wall of the impervious wall to the inside of the wall body, namely from the inner wall of the impervious wall to the outer wall of the impervious wall.
The test box 2 is a hollow box body, a boss 23 inserted at the top of the impervious wall is arranged on the lower surface of the top plate of the test box 2, and a disc is arranged on the bottom plate of the test box 2, so that a groove 24 is formed around the bottom plate of the test box and used for installing the mold 4 for pouring the impervious wall; two automatic exhaust valves 26 and a safety relief valve 25 are arranged on the top plate of the test box 2, one automatic exhaust valve 26 and the safety relief valve 25 are located between the inner wall of the test box 2 and the outer wall of the impervious wall, the other automatic exhaust valve 26 is located on the inner side of the impervious wall, the safety relief valve 25 is used for draining water when the impervious wall is subjected to saturation treatment, and when water is drained from the safety relief valve 25, the completion of the saturation treatment of the impervious wall is indicated.
A water tank partition plate 11-1 is arranged in the separated water tank 11, the inner cavity of the separated water tank 11 is divided into a clear water cavity and an organic liquid cavity, and the lower parts of the two cavities are respectively provided with a second water drain valve 111; the top of the organic liquid cavity is provided with a drug feeding port 11-2 and a stirring motor 11-3, and the output shaft of the stirring motor 3 is connected with an impeller 11-4 through a coupling for preparing infiltration liquid for tests.
A test method for testing the seepage-proofing and pollution-controlling performance of a seepage-proofing wall comprises the following steps:
firstly, pouring and saturation of the impervious wall: placing a mould in a test box, placing a vertical pipeline on the inner side of the mould, and coating release agents on the outer wall of the vertical pipeline and the inner wall of the mould; embedding percolate collecting pipes at the same height and different thicknesses according to test requirements, pouring between the outer wall of the vertical pipeline and the inner wall of the mold, demolding after curing, pulling out the vertical pipeline, and pouring to obtain the hollow cylindrical impervious wall; filling an underground material between the outer wall of the impervious wall and the inner wall of the test box, covering a top plate of the test box after compaction, and inserting a boss of the top plate of the test box at the moment on the top of the impervious wall;
closing a second water discharge valve 111 of the divided water tank 11 and all first water discharge valves 110 in the pipeline, opening a clean water valve 18 and all gate valves 115, starting the multi-stage water pump 12, filling clean water to the inner side and the outer side of the impervious wall through a main pipeline and an auxiliary pipeline, manually adjusting a pressure regulating valve 114, forming pressure difference between the inner side and the outer side of the impervious wall, and performing saturation treatment on the impervious wall; air in the test chamber 2 is exhausted through an automatic exhaust valve 26, and when clear water is exhausted from a safety relief valve 25 on the test chamber 2, the saturation treatment is finished; then, closing the clean water valve 18, the multi-stage water pump 12 and all gate valves 115, opening all the first water drain valves 110, draining the clean water in each pipeline and the test box 2, and closing all the first water drain valves 10 after the clean water is drained completely; and (4) removing the safety relief valve 25, and installing a drain pipe at the position where the safety relief valve 25 is installed, so as to discharge the seepage liquid of the seepage-proofing and pollution-controlling performance test of the seepage-proofing wall.
Secondly, preparing seepage: adding medicines and clean water into the organic liquid cavity of the separated water tank 11, preparing infiltration liquid with a certain concentration according to test requirements, and measuring the initial concentration of the infiltration liquid through a second water drain valve 111 at the lower part of the organic liquid cavity;
thirdly, opening a gate valve 115 on a liquid valve 19, a multi-stage water pump 12, a pipeline between the divided water tank 11 and the multi-stage water pump 12 and a pipeline between the multi-stage water pump 12 and the pressure stabilizing tank 13, adding and injecting seepage liquid into the hollow part of the impervious wall through a main pipeline, enabling the seepage liquid to permeate from the inner side of the impervious wall to the interior of the wall body, and stopping adding and injecting the seepage liquid when each sampling assembly on the impervious wall can collect the seepage liquid; the seepage-proofing and pollution-controlling performance of the seepage-proofing wall under different conditions can be tested by changing one or more variables of osmotic pressure, pollutant types, the thickness of the seepage-proofing wall and the category of the seepage-proofing wall, and the seepage-proofing and pollution-controlling performance mainly comprises the following four variables:
a) the osmotic pressure is changed through the variable frequency control module 16, the exudates at different thicknesses of the impervious wall are collected through the sampling assembly, the concentration of the exudates is measured, the migration situation of pollutants in the impervious wall under different osmotic pressures is simulated, the maximum allowable osmotic slope of the impervious wall is simulated, and the seepage-proofing and pollution-controlling performances of the impervious wall under different osmotic pressures are tested;
b) selecting pollutants encountered in the actual environment or researching the migration rule of specific pollutants in the impervious wall, and then configuring corresponding infiltration liquid in the organic liquid cavity to test the seepage-proofing and pollution-controlling performance of the impervious wall under different pollutants;
c) manufacturing moulds and vertical pipelines with different sizes according to test requirements, and pouring to obtain the impervious walls with different thicknesses so as to test the seepage-proofing and pollution-controlling performances of the impervious walls with different thicknesses;
d) selecting different types of materials to pour the impervious walls so as to test the seepage-proofing and pollution-controlling performances of the impervious walls of different types, wherein the seepage-proofing and pollution-controlling performances comprise rigid, plastic or flexible vertical seepage-proofing walls of single type and composite vertical seepage-proofing walls lapped with geotextile or waterproof pads; the four situations are all single variable changes, and the same principle of multiple variables is not described herein. Nothing in this specification is said to apply to the prior art.
Claims (10)
1. A test device for testing the seepage-proofing and pollution-controlling performance of a seepage-proofing wall is characterized by comprising a constant-pressure variable-frequency speed-regulating liquid supply system, a test box and a sampling assembly;
an impervious wall is placed in the test box, and an underground material is filled between the outer wall of the impervious wall and the inner wall of the test box; the bottom of the test box is provided with a seepage pipe and a clean water pipe, the seepage pipe is positioned on the inner side of the impervious wall, and the clean water pipe is positioned between the outer wall of the impervious wall and the inner wall of the test box;
the constant-pressure variable-frequency speed-regulating liquid supply system is used for introducing clean water or seepage liquid into the test box;
the sampling assemblies are distributed at different positions of the impervious wall and used for collecting exudates.
2. The testing device for the seepage-proofing and pollution-controlling performance test of the impervious wall according to claim 1, wherein the constant-pressure variable-frequency speed-regulating liquid supply system comprises a partitioned water tank, a multi-stage water pump, a pressure stabilizing tank, a pressure transmitter, a flowmeter and a variable-frequency control module;
the separated water tank is provided with a clear water cavity and an organic liquid cavity, and the lower parts of the two cavities are respectively provided with a second water drain valve; the upper part of the clear water cavity and the upper part of the organic liquid cavity are both connected with an external water supply end, the lower part of the clear water cavity is connected with the input end of a multistage water pump through a clear water valve and the lower part of the organic liquid cavity is connected with the input end of an organic liquid valve, the output end of the multistage water pump is connected with the input end of a pressure stabilizing tank, and the output end of the pressure stabilizing tank is connected with a liquid inlet pipe through a main pipeline and is connected with a clear water pipe through an auxiliary pipeline; the flowmeter is installed on the main pipeline, pressure transmitter is installed on the infiltration pipe, and multistage water pump, surge tank, pressure transmitter and flowmeter all are connected with frequency conversion control module.
3. The test device for testing the seepage-proofing and pollution-controlling performance of the impervious wall according to claim 2, wherein a water tank clapboard is arranged in the divided water tank to divide the inner cavity of the divided water tank into a clear water cavity and an organic liquid cavity; the top of the organic liquid cavity is provided with a medicine feeding port and a stirring motor, and an output shaft of the stirring motor is connected with an impeller.
4. The testing device for the seepage-proofing and pollution-controlling performance test of the impervious wall according to claim 2, wherein a first drain valve and a gate valve are arranged on a pipeline between the divided water tank and the multi-stage water pump, a pipeline between the multi-stage water pump and the pressure stabilizing tank and an auxiliary pipeline; a first water drain valve is arranged on the main pipeline; a first check valve is further arranged on a pipeline between the multi-stage water pump and the pressure stabilizing tank, and a second check valve and a pressure regulating valve are further arranged on the auxiliary pipeline.
5. The test device for the anti-seepage and pollution-control performance test of the anti-seepage wall as claimed in claim 4, wherein the top plate of the test box is provided with two automatic exhaust valves and one safety exhaust valve, the safety exhaust valve and the one automatic exhaust valve are positioned between the inner wall of the test box and the outer wall of the anti-seepage wall, and the other automatic exhaust valve is positioned on the inner side of the anti-seepage wall.
6. The testing device for the seepage-proofing and pollution-controlling performance test of the impervious wall according to claim 5, characterized by further comprising a cylindrical mold.
7. The test device for the seepage-proofing and pollution-controlling performance test of the seepage-proofing wall according to claim 5, wherein the test box is a hollow box body, and a boss inserted in the hollow part of the seepage-proofing wall is arranged on the lower surface of a top plate of the test box; the bottom plate of the test box is provided with a disc, so that a groove is formed around the bottom plate of the test box.
8. The test device for testing the seepage-proofing and pollution-controlling performance of the impervious wall according to any one of claims 1 to 7, wherein the sampling assembly comprises a seepage liquid collecting pipe, a guide pipe, a collector, a filter screen and a stop valve; the seepage collecting pipe is embedded in the impervious wall, one end of the seepage collecting pipe does not penetrate through the inner wall of the impervious wall, and the other end of the seepage collecting pipe extends out of the outer wall of the impervious wall; one end of the guide pipe penetrates through the side wall of the test box and is connected with one end of the percolate collecting pipe extending out of the impervious wall; the other end of the conduit is connected with a collector, and the conduit is provided with a filter screen and a stop valve.
9. A test method for testing the seepage-proofing and pollution-controlling performance of a diaphragm wall, which uses the device of claim 6 and is characterized by comprising the following steps:
firstly, pouring and saturation of the impervious wall: placing a mould in a test box, placing a vertical pipeline on the inner side of the mould, and coating release agents on the outer wall of the vertical pipeline and the inner wall of the mould; embedding percolate collecting pipes at different positions of the impervious wall according to test requirements, pouring between the outer wall of the vertical pipeline and the inner wall of the mold, demolding after curing, pulling out the vertical pipeline, and pouring to obtain a hollow cylindrical impervious wall; filling an underground material between the outer wall of the impervious wall and the inner wall of the test box, and covering a top plate of the test box after compacting;
closing a second water discharge valve of the separated water tank and all first water discharge valves in the pipeline, opening a clear water valve and all gate valves, starting the multi-stage water pump, and filling clear water into the inner side and the outer side of the impervious wall through the main pipeline and the auxiliary pipeline; manually adjusting the pressure regulating valve to enable the inner side and the outer side of the impervious wall to form pressure difference, and when clear water is discharged from the safety relief valve, indicating that the saturation treatment is finished; then closing the clean water valve, the multi-stage water pump and all gate valves, opening all first water drain valves, discharging the clean water in each pipeline and the test box, and closing all first water drain valves after the clean water is completely discharged; dismantling the safety relief valve, and installing a drain pipe at the position where the safety relief valve is installed;
secondly, preparing seepage: adding medicines and clear water into an organic liquid cavity of the separated water tank, preparing infiltration liquid with a certain concentration according to test requirements, and measuring the initial concentration of the infiltration liquid through a second water drain valve at the lower part of the organic liquid cavity;
opening a gate valve on an organic liquid valve, a multi-stage water pump, a pipeline between a separated water tank and the multi-stage water pump and a gate valve on a pipeline between the multi-stage water pump and a pressure stabilizing tank, adding and injecting seepage liquid into the hollow part of the impervious wall through a main pipeline, enabling the seepage liquid to permeate from the inner side of the impervious wall to the inner part of the wall body, and stopping adding and injecting the seepage liquid when each sampling assembly on the impervious wall can collect the seepage liquid; the migration situation of the seepage entering liquid in the seepage-proofing wall is simulated by measuring the concentration of the seepage at different positions of the seepage-proofing wall.
10. The test method for the seepage-proofing and pollution-controlling performance test of the seepage-proofing wall according to claim 9, wherein one or more variables of osmotic pressure, pollutant types, the thickness of the seepage-proofing wall and the category of the seepage-proofing wall are changed so as to test the seepage-proofing and pollution-controlling performance of the seepage-proofing wall under different test conditions.
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