A test apparatus and method for early deterioration and seepage failure of a water-cutting curtain.

Abstract

This invention relates to the fields of seepage prevention engineering, curtain interception, and groundwater resource protection in mining, water conservancy and hydropower, and municipal engineering. It discloses a test device and method for testing the early deterioration and seepage failure of a cutoff curtain. The curtain test chamber of the test device for early deterioration and seepage failure of a cutoff curtain provided by this invention includes a curtain wall, a geomembrane, and clamping frames. Two clamping frames are arranged opposite each other and detachably connected. The geomembrane includes two geomembrane sheets, with one end of each sheet overlapping. The geomembrane is clamped between the two clamping frames. Curtain walls are cast on both sides of the geomembrane opposite to the front and rear rock masses, and the curtain walls are in a state of incomplete solidification. With this configuration, the test device provided by this invention can conduct early deterioration and seepage failure tests of cutoff curtains under dynamic water conditions.

Description

Technical Field

[0001] This invention relates to the fields of seepage prevention engineering, curtain interception and groundwater resource protection in mining, water conservancy and hydropower, municipal engineering and other fields, and in particular to a test device and test method for early deterioration and seepage damage of interception curtains. Background Technology

[0002] my country's open-pit coal mines are mainly distributed in the ecologically fragile, arid and semi-arid western regions such as Inner Mongolia, Shanxi, and Xinjiang, where evaporation exceeds precipitation, making the ecosystems difficult to repair once damaged. Open-pit coal mines control groundwater levels by draining large volumes of water, leading to ecological problems such as declining groundwater levels, vegetation death, and desertification. Simultaneously, pore water seeps along rock and soil fissures and fracture surfaces, accelerating the deterioration of rock and soil properties, reducing their strength, and causing slope collapses or instability. Cut-off walls can address the ecological problems caused by mine drainage and effectively protect groundwater resources. However, the central funnel formed by mine drainage creates a dynamic water environment with high velocity, large flow, and high head, causing early-stage hydration of the cut-off wall in open-pit coal mines to deteriorate, leading to seepage damage, increased leakage, reduced interception effectiveness, and ultimately, piping, slope collapses, and other accidents, threatening safe coal mining. In the early stages of hydration, the curtain wall in open-pit coal mines is eroded by pore water, which deteriorates the curtain's strength and impermeability, causing gaps to form and leading to seepage damage that causes curtain failure and threatens safe mining operations.

[0003] Existing methods for testing the quality of cutoff walls mainly involve on-site sampling and curing to a certain age, or drilling core samples from the wall to test compressive strength, splitting tensile strength, flexural tensile strength, and permeability coefficient. Most of these tests are conducted under ideal conditions. Current technologies do not consider the impact of high-pressure, fast-flowing, and high-volume groundwater erosion and seepage damage on the cutoff wall during the initial pouring stage (before the wall solidifies), at joints, sedimentation sections, and at the connection points of the geomembrane. The dynamic water erosion and seepage of the groundwater environment severely affect the construction quality and water interception effect of the cutoff wall. Therefore, conducting early-stage hydration deterioration and seepage damage tests on cutoff walls under dynamic water conditions is a critical issue, and currently, relevant testing equipment is lacking.

[0004] Therefore, how to provide a test device capable of conducting early-stage deterioration and seepage damage tests of cutoff curtains under dynamic water conditions has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the above technical problems, this invention provides a test apparatus and method for conducting early-stage deterioration and seepage damage tests of cutoff curtains under dynamic water conditions.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] This invention provides a test device for early deterioration and seepage failure of a water-cutting curtain, comprising:

[0008] The pre-processor includes a pre-processor water tank and a first water pressure monitoring instrument for monitoring the water pressure inside the pre-processor water tank;

[0009] The rear assembly includes a rear water tank, a second water pressure monitor, a drain pipe, a drain valve, a drain pressure gauge, and a drain flow meter. The second water pressure monitor is used to monitor the water pressure inside the rear water tank. The drain pipe is connected to the rear water tank. The drain valve is installed on the drain pipe. The drain pressure gauge is used to monitor the water pressure inside the drain pipe. The drain flow meter is used to monitor the flow rate inside the drain pipe.

[0010] The outer casing has the front water tank and the rear water tank respectively disposed on opposite sides of the outer casing, and both sides of the outer casing opposite to the front water tank and the rear water tank are open.

[0011] The test assembly includes a front rock and soil mass, a rear rock and soil mass, and a curtain test chamber. The curtain test chamber is located between the front rock and soil mass and the rear rock and soil mass. The curtain test chamber includes a curtain wall, a geomembrane, and clamping frames. Two clamping frames are arranged opposite each other and detachably connected. The geomembrane includes two geomembrane sheets, one end of which overlaps with each other. The geomembrane is clamped between the two clamping frames. The curtain wall is cast on both sides of the geomembrane opposite to the front and rear rock and soil masses, and the curtain wall is in a state of incomplete solidification. The shell is provided with an installation groove that matches the shape of the curtain test chamber. The curtain test chamber is disposed in the installation groove. The front rock and soil body and the rear rock and soil body are both disposed inside the shell. The front rock and soil body and the rear rock and soil body are respectively disposed opposite to the front water tank and the rear water tank. The portion of the front water tank opposite to the front rock and soil body is provided with multiple water permeable holes. Each of the water permeable holes is used to connect the front water tank and the front rock and soil body. The side of the rear water tank near the rear rock and soil body is provided with multiple water filter holes. Each of the water filter holes is used to connect the rear water tank and the rear rock and soil body.

[0012] A pressurizing device is disposed inside the housing, positioned above the test assembly, and connected to the top of the housing;

[0013] A horizontal water-blocking body is disposed inside the outer shell, between the pressurizing device and the test assembly, and at the top of the test assembly. The horizontal water-blocking body is used to prevent water inside the test assembly from flowing upward along the height direction of the outer shell.

[0014] A load transfer assembly is disposed inside the housing and between the horizontal water barrier and the pressurizing device. The load transfer assembly includes a cover plate and an overlying soil mass. The pressurizing device abuts against the cover plate to apply a load to the cover plate. The cover plate is disposed at the top of the overlying soil mass, which is also disposed at the top of the horizontal water barrier. The overlying soil mass is used to transfer the load applied to the cover plate to the horizontal water barrier. The horizontal water barrier is capable of transferring the load applied to the cover plate to the test assembly.

[0015] The water injection assembly includes a water injection pump, a water injection pressure gauge, a water injection flow meter, a water injection valve, and a water injection pipe. The water injection pump is connected to the pre-water tank through the water injection pipe. The water injection pressure gauge is used to measure the pressure of the water injection pump during the water injection process. The water injection flow meter is used to measure the flow rate of the water injection pump during the water injection process. The water injection valve is installed on the water injection pipe.

[0016] The pressure stabilizing assembly includes a pressure stabilizing pump, a pressure stabilizing gauge, a pressure stabilizing flow meter, a pressure stabilizing valve, and a pressure stabilizing water pipe. The pressure stabilizing pump is connected to the downstream water tank through the pressure stabilizing water pipe. The pressure stabilizing gauge is used to measure the pressure of the pressure stabilizing pump during the pressure stabilization process. The pressure stabilizing flow meter is used to measure the flow rate of the pressure stabilizing pump during the pressure stabilization process. The pressure stabilizing valve is installed on the pressure stabilizing water pipe.

[0017] Optionally, the early deterioration and seepage failure test device for the water-cutting curtain also includes a snap-fit ​​body, which is provided along the top circumferential edge of the outer shell. The snap-fit ​​body has an inverted L-shaped cross-section and is connected to the side of the front water tank near the outer shell, the side of the rear water tank near the outer shell, and the inner wall of the outer shell.

[0018] Optionally, the early deterioration and seepage failure test device for the water-blocking curtain also includes two water-stop strips. Both water-stop strips are set at the bottom end of the horizontal water-blocking body, and the two water-stop strips are respectively attached to both sides of the curtain test chamber. Each water-stop strip is set along the length direction of the curtain test chamber.

[0019] Optionally, the early deterioration and seepage failure test device for the water-blocking curtain also includes multiple pressure detection devices. All of the pressure detection devices are evenly arranged at the top of the horizontal water-blocking body, and each of the pressure detection devices is used to detect the vertical pressure on the horizontal water-blocking body.

[0020] Optionally, the foreground soil mass is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials; the background soil mass is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials; and the overlying soil mass is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials.

[0021] Optionally, the pressurizing device is a hydraulic jack.

[0022] Optionally, the two geomembranes are connected by magnetic attraction or thermal fusion.

[0023] Optionally, the curtain wall is made of one or more of the following: sand, gravel, pebbles, clay, plastic concrete, impermeable concrete, cement clay slurry, cement powder, and fly ash.

[0024] Optionally, the horizontal water barrier is a steel plate, or the horizontal water barrier is made of waterproof rubber, and a steel frame is provided inside the horizontal water barrier.

[0025] The present invention also provides a test method for the early deterioration and seepage failure test device of the cutoff curtain, comprising the following steps:

[0026] Step 1: Apply vertical pressure to the load transfer component through the pressurization device to simulate the stress state of different burial depths and different overlying surrounding rocks at the construction site.

[0027] Step 2: Open the water injection valve. The water injection pump will pump the external water source into the pre-water tank through the water injection pipe. The water in the pre-water tank will enter the foreground soil and the front side of the curtain test chamber through the water permeable hole. The water pressure in the pre-water tank will continuously rise. When the first water pressure monitoring instrument reaches the preset water pressure required for the test, close the water injection valve and record the pressure value of the water injection pressure gauge and the output flow rate of the water injection flow meter.

[0028] Step 3: Open the pressure stabilizing valve of the pressure stabilizing pump. The pressure stabilizing pump pumps the external water source into the rear water tank through the pressure stabilizing water pipe. The water in the rear water tank enters the rear rock and soil body and the rear side of the curtain test chamber through the water filter hole. When the water pressure of the second water pressure monitor reaches the preset rear water pressure required for the test, close the water injection valve and record the pressure value of the pressure stabilizing pressure gauge and the output flow of the pressure stabilizing flow meter.

[0029] Step 4: When the water in the pre-water tank enters the post-water tank through the front rock and soil body, the curtain test chamber and the rear rock and soil body in sequence, causing the pressure of the second water pressure monitor to rise, open the drain valve to reduce the water pressure in the post-water tank back to the post-preset water pressure, and record the water discharge volume of the drain flow meter.

[0030] Step 5: Repeat steps 2 to 4 to keep the water pressure in the pre-tank at the pre-set water pressure and the water pressure in the post-tank at the post-set water pressure. Select multiple time periods and record the total amount of water discharged by the drainage flow meter in each time period. Analyze the water-blocking performance of the water curtain under different water pressure conditions and at different time periods based on the total amount of water discharged.

[0031] The present invention achieves the following technical effects compared to the prior art:

[0032] The early deterioration and seepage failure test device for intercepting curtains provided by this invention, consisting of a pre-water tank, front rock and soil, curtain test chamber, rear rock and soil, rear water tank, pressurization device, horizontal water-blocking body, load transfer component, water injection pump, and pressure stabilizing pump, constructs a test device capable of simulating early deterioration and seepage failure of intercepting curtains under different water head pressures on the upstream and downstream sides, different water pressure differences between the inner and outer sides of the curtain, different burial depths, different vertical stresses, different water-passing media, different overlying rock and soil, different intercepting curtain forms, and different intercepting curtain materials. This ensures test accuracy and improves test precision, enabling early deterioration and seepage failure tests of intercepting curtains under dynamic water conditions with multiple water head pressures and multiple material types. It solves the problem of the lack of test devices for early deterioration and seepage failure of curtains under dynamic water conditions, realizing the test verification and evaluation of early deterioration and seepage failure characteristics of curtains under dynamic water conditions, and effectively guiding on-site engineering construction. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a front view of the test device for early deterioration and seepage damage of the water-cutting curtain provided in this embodiment of the invention;

[0035] Figure 2 for Figure 1 AA section view;

[0036] Figure 3 This is a schematic diagram of the structure of the curtain test chamber of the early deterioration and seepage failure test device for the water-cutting curtain provided in this embodiment of the invention;

[0037] Figure 4 This is a schematic diagram of the structure of the pre-water tank of the early deterioration and seepage damage test device for the water-cutting curtain provided in this embodiment of the invention;

[0038] Figure 5 This is a schematic diagram of the structure of the rear water tank of the test device for early deterioration and seepage damage of the water-cutting curtain provided in the embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the outer shell of the test device for early deterioration and seepage damage of the water-cutting curtain provided in this embodiment of the invention;

[0040] Figure 7 This is a schematic diagram of the structure of the horizontal water-blocking body in the early deterioration and seepage damage test device of the water-blocking curtain provided in the embodiment of the present invention.

[0041] Figures 1-7 Explanation of reference numerals in the attached diagram: 100. Test apparatus for early deterioration and seepage failure of water-cutting curtain; 1. Pre-water tank; 2. First water pressure monitor; 3. Rear water tank; 4. Second water pressure monitor; 5. Drainage pipe; 6. Drainage valve; 7. Drainage pressure gauge; 8. Drainage flow meter; 9. Outer shell; 10. Front rock and soil; 11. Rear rock and soil; 12. Curtain test chamber; 13. Clamping frame; 14. Impermeable membrane; 15. Permeable hole; 16. Pressurization device; 17. Horizontal resistance. 18. Water body; 19. Cover plate; 20. Overlying rock and soil; 21. Water injection pump; 22. Water injection pressure gauge; 23. Water injection flow meter; 24. Water injection valve; 25. Water injection pipe; 26. Pressure stabilizing pump; 27. Pressure stabilizing pressure gauge; 28. Pressure stabilizing flow meter; 29. ​​Pressure stabilizing valve; 30. Pressure stabilizing water pipe; 31. First clamping connector; 32. Second clamping connector; 33. Third clamping connector; 34. Waterstop strip; 35. Pressure detection device; 36. Mounting groove; 37. Filter hole. Detailed Implementation

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] The purpose of this invention is to provide a test apparatus and test method for conducting early-stage deterioration and seepage damage tests of cutoff curtains under dynamic water conditions.

[0044] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1:

[0046] like Figure 1-7 As shown, the early deterioration and seepage damage test device 100 for water cutoff curtain provided in this embodiment includes a pre-assembly component, a post-assembly component, a housing 9, a test component, a pressurizing device 16, a horizontal water barrier 17, a load transfer component, a water injection component, and a pressure stabilizing component.

[0047] The pre-processor includes a pre-tank 1 and a first water pressure monitor 2 for monitoring the water pressure inside the pre-tank 1.

[0048] The post-installation components include a post-water tank 3, a second water pressure monitor 4, a drain pipe 5, a drain valve 6, a drain pressure gauge 7, and a drain flow meter 8. The second water pressure monitor 4 is used to monitor the water pressure inside the post-water tank 3. The drain pipe 5 is connected to the post-water tank 3. The drain valve 6 is installed on the drain pipe 5. The drain pressure gauge 7 is used to monitor the water pressure inside the drain pipe 5. The drain flow meter 8 is used to monitor the flow rate inside the drain pipe 5.

[0049] The front water tank 1 and the rear water tank 3 are respectively located on opposite sides of the outer casing 9, and both sides of the outer casing 9 opposite to the front water tank 1 and the rear water tank 3 are open.

[0050] The test assembly includes a front rock and soil mass 10, a rear rock and soil mass 11, and a curtain test chamber 12. The curtain test chamber 12 is located between the front rock and soil mass 10 and the rear rock and soil mass 11. The curtain test chamber 12 includes a curtain wall, a geomembrane, and clamping frames 13. The clamping frames 13 are frame structures, with two clamping frames 13 arranged opposite to each other and detachably connected. The geomembrane includes two geomembrane sheets 14, with one end of the two geomembrane sheets 14 overlapping each other. The geomembrane is clamped between the two clamping frames 13. Curtain walls are cast on both sides of the geomembrane opposite to the front rock and soil mass 10 and the rear rock and soil mass 11, and the curtain walls are in a state of incomplete solidification. The outer shell 9 is provided with an installation groove 35 that matches the shape of the curtain test chamber 12. The curtain test chamber 12 is set in the installation groove 35. The front rock and soil body 10 and the rear rock and soil body 11 are both set inside the outer shell 9. The front rock and soil body 10 and the rear rock and soil body 11 are respectively positioned opposite the front water tank 1 and the rear water tank 3. The portion of the front water tank 1 opposite the front rock and soil body 10 is provided with multiple water permeable holes 15. Each water permeable hole 15 is used to connect the front water tank 1 and the front rock and soil body 10. The side of the rear water tank 3 near the rear rock and soil body 11 is provided with multiple water filter holes 36. Each water filter hole 36 is used to connect the rear water tank 3 and the rear rock and soil body 11. The diameter of the water filter holes is smaller than the diameter of the water permeable holes.

[0051] The pressurizing device 16 is disposed inside the housing 9, above the test assembly, and connected to the top of the housing 9.

[0052] A horizontal water-blocking body 17 is disposed inside the outer casing 9, between the pressurizing device 16 and the test assembly, and at the top of the test assembly. The horizontal water-blocking body 17 prevents water inside the test assembly from flowing upwards along the height of the outer casing 9. The horizontal water-blocking body is non-deformable, pressure-resistant, and water-blocking. Specifically, the horizontal water-blocking body is made of steel plate or waterproof rubber, and has an internal steel frame. Of course, other structures with non-deformable, pressure-resistant, and water-blocking properties can also be used for the horizontal water-blocking body.

[0053] The load transfer assembly is located inside the housing 9 and between the horizontal water barrier 17 and the pressurizing device 16. The load transfer assembly includes a cover plate 18 and an overlying rock and soil body 19. The pressurizing device 16 abuts against the cover plate 18 to apply a load to the cover plate 18. The cover plate 18 is located at the top of the overlying rock and soil body 19, which is located at the top of the horizontal water barrier 17. The overlying rock and soil body 19 is used to transfer the load applied to the cover plate 18 to the horizontal water barrier 17. The horizontal water barrier 17 can transfer the load applied to the cover plate 18 to the test assembly.

[0054] The water injection assembly includes a water injection pump 20, a water injection pressure gauge 21, a water injection flow meter 22, a water injection valve 23, and a water injection pipe 24. The water injection pump 20 is connected to the pre-water tank 1 through the water injection pipe 24. The water injection pressure gauge 21 is used to measure the pressure of the water injection pump 20 during the water injection process. The water injection flow meter 22 is used to measure the flow rate of the water injection pump 20 during the water injection process. The water injection valve 23 is installed on the water injection pipe 24.

[0055] The pressure stabilizing assembly includes a pressure stabilizing pump 25, a pressure stabilizing gauge 26, a pressure stabilizing flow meter 27, a pressure stabilizing valve 28, and a pressure stabilizing water pipe 29. The pressure stabilizing pump 25 is connected to the downstream water tank 3 through the pressure stabilizing water pipe 29. The pressure stabilizing gauge 26 is used to measure the pressure of the pressure stabilizing pump 25 during the pressure stabilizing process. The pressure stabilizing flow meter 27 is used to measure the flow rate of the pressure stabilizing pump 25 during the pressure stabilizing process. The pressure stabilizing valve 28 is installed on the pressure stabilizing water pipe 29.

[0056] In this embodiment, the early deterioration and seepage damage test device 100 for the water-blocking curtain also includes a snap-fit ​​body. The snap-fit ​​body is disposed along the circumferential edge of the top end of the outer shell 9. The cross-sectional shape of the snap-fit ​​body is an inverted L-shape. The snap-fit ​​body is connected to the side of the front water tank 1 near the outer shell 9, the side of the rear water tank 3 near the outer shell 9, and the inner wall of the outer shell 9. The snap-fit ​​body forms a closed loop, which can completely lock the top edge of the horizontal water-blocking body 17, forming a vertical water-blocking system and preventing water from flowing around the vertical direction.

[0057] Furthermore, the snap-fit ​​body includes a first snap-fit ​​component 30, a second snap-fit ​​component 31, and a third snap-fit ​​component 32. The first snap-fit ​​component 30 is disposed on the side of the front water tank 1 near the curtain test chamber 12, the second snap-fit ​​component 31 is disposed on the side of the rear water tank 3 near the curtain test chamber 12, and the third snap-fit ​​component 32 is disposed on the inner side wall of the outer shell 9.

[0058] In this embodiment, the early deterioration and seepage failure test device 100 for the water-blocking curtain also includes two water-stop strips 33. Both water-stop strips 33 are located at the bottom end of the horizontal water-blocking body 17, and are respectively attached to both sides of the curtain test chamber 12. Each water-stop strip 33 is arranged along the length of the curtain test chamber 12. The bottom ends of the two water-stop strips 33 and the horizontal water-blocking body 17 can wrap around the top of the curtain test chamber 12, completely securing the top of the curtain test chamber 12. This prevents water flow on the side of the curtain test chamber 12 near the front rock and soil 10 from flowing horizontally around the horizontal water-blocking body 17 above the mounting groove 35 during the test.

[0059] In this embodiment, as Figure 2As shown, the early deterioration and seepage failure test device 100 for the water-blocking curtain also includes multiple pressure detection devices 34. All pressure detection devices 34 are evenly arranged at the top of the horizontal water-blocking body 17. Each pressure detection device 34 is used to detect the vertical pressure on the horizontal water-blocking body 17, and the direction of the vertical pressure is the same as the direction of the load. Pressure sensors can be selected for the pressure detection devices 34.

[0060] In this embodiment, the foreground soil 10 is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials. These materials can simulate the water flow patterns of Quaternary loose layers such as sand layers, sand and pebble layers, gravel and pebble layers, and soil layers, as well as bedrock layers such as sandstone, limestone, and sandy mudstone.

[0061] In this embodiment, the back rock and soil 11 is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials. These materials can respectively simulate the water filtration modes of Quaternary loose layers such as sand layers, sand and pebble layers, pebble and gravel layers, and soil layers, as well as bedrock layers such as sandstone, limestone, and sandy mudstone.

[0062] In this embodiment, the overlying soil 19 is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials. These materials can respectively simulate the overlying soil 19 of Quaternary loose layers such as sand layers, sand and pebble layers, pebble and gravel layers, soil layers, and bedrock layers such as sandstone, limestone, and sandy mudstone.

[0063] In this embodiment, the pressurizing device 16 is a hydraulic jack. It should be noted that the pressurizing device 16 is not limited to a hydraulic jack; this is only an example.

[0064] In this embodiment, the two geomembranes 14 are connected by magnetic attraction or thermal fusion. Similarly, the geomembranes 14 are not limited to being connected by magnetic attraction or thermal fusion; other methods can also be used, which are also illustrated here.

[0065] In this embodiment, the curtain wall is made of one or more of the following: sand, gravel, pebbles, clay, plastic concrete, impermeable concrete, cement clay slurry, cement powder, and fly ash.

[0066] In this embodiment, in order to extend the service life of the cover plate 18, the cover plate 18 is specifically made of steel plate, but it is not limited to steel plate. This is just an example.

[0067] The early deterioration and seepage failure test device 100 for water-cutting curtains provided in this embodiment has the following advantages:

[0068] 1. The test device 100 for early deterioration and seepage failure of water-cutting curtains provided by the present invention, through a front water tank 1, front rock and soil 10, curtain test chamber 12, rear rock and soil 11, rear water tank 3, pressurization device 16, horizontal water-blocking body 17, load transfer component, water injection pump 20 and pressure stabilizing pump 25, constructs a test device 100 for early deterioration and seepage failure of water-cutting curtains that can simulate different water head pressures on the front and back sides, different water pressure differences between the inner and outer sides of the curtain, different burial depths, different vertical stresses, different water-passing media, different overlying rock and soil 19, different forms of water-cutting curtains, and different materials of water-cutting curtains. It ensures the accuracy of the test, improves the precision of the test, realizes the early deterioration and seepage failure test of water-cutting curtains with multiple water head pressures and multiple material types under dynamic water conditions, and solves the problem of lack of test devices for early deterioration and seepage failure of curtains under dynamic water conditions.

[0069] 2. The test device for early deterioration and seepage damage of the cutoff curtain provided by the present invention enables quantitative calculation, analysis and evaluation of the water interception rate under early deterioration conditions of the cutoff curtain, and achieves comprehensive analysis and evaluation from macroscopic to mesoscopic and then to microscopic by combining the appearance morphology, mechanical parameters and microstructure.

[0070] 3. The water-cutting curtain early deterioration and seepage damage test device 100 provided by the present invention can conduct water-cutting effect and seepage damage tests on curtain walls, joints, sediment sections, and geomembrane connections under different dynamic water conditions and at different early ages. It realizes flexible water pressure conditions and fully considers the formation confining pressure environment, and solves the problems in the prior art that the curtain walls, joints, sediment sections, and geomembrane connections cannot be detected, the dynamic water condition test environment is difficult to construct, the influence of early hydration performance deterioration cannot be considered, and the water pressure is difficult to adjust.

[0071] 4. The early deterioration and seepage damage test device 100 for intercepting curtains provided by this invention can not only conduct early deterioration and seepage damage tests on the curtains, but also conduct connection effect tests of the geomembrane in various ways such as magnetic attraction and hot melting. It integrates multiple functional attributes such as water blocking effect evaluation, seepage damage analysis, and curtain combination design. Furthermore, it can set and stably maintain the water head height on the outer side and the water head height on the inner side of the intercepting curtain according to the actual engineering conditions, ensuring the authenticity, accuracy, and reliability of the test process.

[0072] The test method of the early deterioration and seepage failure test device 100 for water-cutting curtain provided in this embodiment includes the following steps:

[0073] Step 1: Apply vertical pressure to the load transfer component through the pressurization device 16 to simulate the stress state of different burial depths and different overlying surrounding rocks at the construction site.

[0074] Step 2: Open the water injection valve 23. The water injection pump 20 pumps the external water source into the pre-water tank 1 through the water injection pipe 24. The water in the pre-water tank 1 enters the front rock and soil 10 and the front side of the curtain test chamber 12 through the water permeable hole 15. The water pressure in the pre-water tank 1 continuously rises. When the first water pressure monitoring instrument 2 reaches the pre-set water pressure required for the test, close the water injection valve 23 and record the pressure value of the water injection pressure gauge 21 and the output flow rate of the water injection flow meter 22.

[0075] Step 3: Open the pressure stabilizing valve 28 of the pressure stabilizing pump 25. The pressure stabilizing pump 25 pumps the external water source into the rear water tank 3 through the pressure stabilizing water pipe 29. The water in the rear water tank 3 enters the rear rock and soil body 11 and the rear side of the curtain test chamber 12 through the water filter hole 36. When the water pressure of the second water pressure monitoring instrument 4 reaches the preset rear water pressure required for the test, close the water injection valve 23 and record the pressure value and the output flow of the pressure stabilizing flow meter 27.

[0076] Step 4: Water in the pre-water tank 1 enters the post-water tank 3 through the front rock and soil body 10, the curtain test chamber 12 and the rear rock and soil body 11 in sequence. When the pressure of the second water pressure monitor 4 increases, the drain valve 6 is opened to reduce the water pressure in the post-water tank 3 back to the preset post-water pressure, and the discharge volume of the drain flow meter 8 is recorded.

[0077] Step 5: Repeat steps 2 to 4 to maintain the water pressure in the pre-tank 1 at the pre-set pressure and the water pressure in the post-tank 3 at the post-set pressure. Select multiple time periods with the same duration Δt and record the total water discharge from the drain flow meter 8 during each time period. The leakage during the early deterioration process of the water-cutting curtain. Where S is the length of the curtain wall, H is the height of the curtain wall, and D is the thickness of the curtain wall. Based on the total water discharge data, the water-blocking performance of the water-cutting curtain wall under different water pressure conditions and at different time periods is analyzed.

[0078] Furthermore, the following steps are included before step one:

[0079] Assemble the early deterioration and seepage damage test device 100 for the water-cutting curtain provided in this embodiment.

[0080] Specifically, the following steps are included:

[0081] like Figure 1 and Figure 3 As shown, the geomembrane is clamped between two clamping frames 13, and the two geomembrane sheets 14 of the geomembrane form an overlap section of a preset length L. The specific size of the preset length depends on actual needs. During the test, the two geomembrane sheets 14 are connected with different lengths and different connection methods according to the test and on-site requirements.

[0082] like Figure 1 and Figure 6 As shown, the curtain test chamber 12 is placed in the mounting slot 35.

[0083] Curtain walls are formed by pouring water on both sides of the impermeable membrane 14.

[0084] like Figure 1 As shown, the space between the curtain test chamber 12 and the pre-positioned water tank 1 is filled with foreground soil 10 made of one or more materials selected from silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, or cementing materials, and compacted. This simulates the water flow pattern of Quaternary loose layers such as sand layers, gravel layers, pebble layers, or soil layers, and bedrock layers such as sandstone, limestone, or sandy mudstone.

[0085] like Figure 1 As shown, the space between the curtain test chamber 12 and the rear water tank 3 is filled with a back rock soil 11 made of one or more materials selected from silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, or cementing materials, and compacted. This simulates the filtration mode of Quaternary loose layers such as sand layers, gravel layers, pebble layers, and soil layers, as well as bedrock layers such as sandstone, limestone, and sandy mudstone.

[0086] The two water-stop strips 33 at the bottom of the horizontal water-blocking body 17 are respectively clamped on the top sides of the curtain test chamber 12, wrapping the top of the curtain test chamber 12 and completely clamping the top of the curtain test chamber 12 to prevent the water flow from bypassing in the horizontal direction; the four sides of the horizontal water-blocking body 17 are clamped in the clamping parts to form a closed loop, completely clamping the horizontal water-blocking body 17 and forming a vertical water-blocking system to prevent the water flow from bypassing in the vertical direction.

[0087] like Figure 1 As shown, a pressure detection device 34 is installed above the horizontal water-blocking body 17.

[0088] like Figure 1 and Figure 2 As shown, the overlying rock and soil body 19 is filled with one or more of the following materials: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, or cementing materials. This simulates the overlying rock and soil body 19 of Quaternary loose layers such as sand layers, sand and pebble layers, pebble and gravel layers, or soil layers, as well as the overlying rock and soil body 19 of bedrock layers such as sandstone, limestone, or sandy mudstone. A cover plate 18 is then laid on the overlying rock and soil body 19.

[0089] Following step five, the following steps are also included:

[0090] like Figure 1As shown, after the leakage test under the early deterioration conditions of the water cutoff curtain is completed, the water injection pump 20 and the pressure stabilizing pump 25 are stopped, the pressure stabilizing valve 28 is opened, and the water in the post-water tank 3 and the pre-water tank 1 is released through the pressure stabilizing water pipe 29.

[0091] Lower the hydraulic jack back to its initial position.

[0092] Such as 1 and Figure 2 As shown, the overlying soil and rock mass 19 was opened, the horizontal water-blocking body 17 was removed, the curtain test chamber 12 was taken out, and the curtain wall after being subjected to the action of dynamic water scouring during the early cementation process of the water-cutting curtain was taken out. The appearance morphology was characterized, the strength was tested, and the microstructure was analyzed. The influence of water flow on the curtain performance under dynamic water conditions, the degree of early deterioration of the water-cutting curtain, and the safety performance of the water-cutting curtain were further analyzed from the perspective of macro to micro.

[0093] The following is a specific example to illustrate the test method of the early deterioration and seepage failure test device for the intercepting curtain protected by this invention:

[0094] A certain open-pit coal mine has a drainage capacity of 60,000 m³. 3 The water supply source is a Quaternary loose aquifer, consisting of gravel, 56m thick, with a permeability coefficient k = 100m / d. A cutoff curtain is proposed to intercept the water supply source outside the mine pit. The cutoff curtain is 58m deep, made of plastic concrete, and 600mm thick. Assuming the water head height outside the curtain is 30m and the water head height inside the curtain is 5m during construction, analyze and test the water-blocking effect of the cutoff curtain under the action of flowing water and whether seepage failure occurs.

[0095] Step 1, as follows Figure 1 and Figure 3 As shown, the geomembrane is clamped between two clamping frames 13.

[0096] Step two, as Figure 1 and Figure 6 As shown, the curtain test chamber 12 is placed in the mounting slot 35.

[0097] Step 3: Cast curtain walls on both sides of the impermeable membrane 14. The curtain wall in the curtain test chamber 12 has a length of S=2m, a height of H=1m, and a thickness of D=0.6m.

[0098] Step four, as Figure 1 As shown, the space between the curtain test chamber 12 and the pre-water tank 10 is filled with a mixture of gravel and pebbles, compacted to a permeability coefficient of k = 100 m / d. This simulates the water flow pattern of the Quaternary loose gravel layer in the engineering site.

[0099] Step 5, as Figure 1As shown, the space between the curtain test chamber 12 and the rear water tank 3 in the back rock and soil mass 11 is filled with a mixture of gravel and pebbles, compacted to a permeability coefficient of k = 100 m / d. This simulates the filtration mode of the Quaternary loose gravel layer in the engineering site.

[0100] Step six: Secure the two waterstops 33 at the bottom of the horizontal water-blocking body 17 to the top sides of the curtain test chamber 12, wrapping the top of the curtain test chamber 12 and completely securing the top of the curtain test chamber 12 to prevent the water flow from bypassing in the horizontal direction; secure the four sides of the horizontal water-blocking body 17 within the snap-fit ​​fitting to form a closed loop, completely securing the horizontal water-blocking body 17 and forming a vertical water-blocking system to prevent the water flow from bypassing in the vertical direction.

[0101] Step seven, as Figure 1 As shown, a pressure detection device 34 is installed above the horizontal water-blocking body 17.

[0102] Step eight, as Figure 1 and Figure 2 As shown, gravel and pebble materials are filled into the space of the overlying rock and soil 19 to simulate the overlying soil of the Quaternary loose gravel and pebble layer, and a load-bearing cover plate 18 is laid on the overlying rock and soil 19.

[0103] Step nine, as Figure 1 As shown, vertical pressure is applied to the load transfer assembly through the pressurizing device 16, and transmitted through the overlying soil and rock mass 19 to the horizontal water-blocking body 17, thereby applying a vertical stress P above the curtain test chamber 12, the front soil and rock mass 10, and the rear soil and rock mass 11. 外 This makes the vertical pressure P monitored by the pressure detection device 34 equal to P 外 +P 覆 =1.12MPa, simulating the stress state of the overlying rock with a vertical pressure of 1.12MPa at a construction site depth of 56m.

[0104] Step 10: Open the water injection valve 23. The water injection pump 20 pumps the external water source into the pre-water tank 1 through the water injection pipe 24. The water in the pre-water tank 1 enters the foreground soil 10 and the side of the curtain test chamber 12 closest to the foreground soil 10 through the water permeability hole 15. The water pressure in the pre-water tank 1 continuously rises, and the first water pressure monitoring instrument 2 reaches the preset pre-pressure P required for the test. 前 =0.03MPa, close water injection valve 23, and record the pressure value P of water injection pressure gauge 21. 泵 The output flow rate Q of the water injection flow meter 22 输 .

[0105] Step eleven, as follows Figure 1As shown, the pressure regulating valve 28 of the pressure regulating pump 25 is opened, and the pressure regulating pump 25 pumps the external water source into the rear water tank 3 through the pressure regulating water pipe 29. The water in the rear water tank 3 enters the back rock and soil body 11 and the side of the curtain test chamber 12 near the back rock and soil body 11 through the water filter hole 36. The water pressure of the second water pressure monitoring instrument 4 reaches the rear preset water pressure P required for the test. 后 When the pressure is 0.005 MPa, close the pressure regulating valve 28 and record the pressure value P of the pressure regulating gauge 26. 稳 The output flow rate Q of the pressure-stabilized flow meter 27 稳 At this time, the pressure difference between the two sides of the curtain test chamber 12 is ΔP = P 前 -P 后 =0.025MPa.

[0106] Step 12, as follows Figure 1 As shown, water in the pre-water tank 1 flows sequentially through the front rock and soil mass 10, the curtain test chamber 12, and the rear rock and soil mass 11 into the rear water tank 3. When the pressure of the second water pressure monitor 4 increases, the drain valve 6 is opened to reduce the water pressure in the rear water tank 3 back to the preset rear water pressure, and the discharge volume Q of the drain flow meter 8 is recorded. 放 .

[0107] Step thirteen: Repeat steps ten and twelve to maintain the water pressure in the pre-tank 1 at P. 前 =0.03MPa, ensuring that the water pressure in the post-water tank 3 is always maintained at P. 后 =0.005MPa, maintain the water head pressure difference on both sides of the curtain test chamber 12 as ΔP = P 前 -P 后 =0.025MPa, test times T = 1h, 24h, 72h, record the water volume passing through the cutoff curtain of the curtain test chamber 12 within Δt = 1.0h at each test time. The recorded results are shown in Table 1. The leakage during the early deterioration process of the cutoff wall is... Table 1 shows the test results. Under the conditions of a water head pressure of 0.03 MPa on the outside and 0.005 MPa on the inside of the cutoff curtain, the water pressure difference between the inside and outside of the curtain is 0.025 MPa. In a dynamic water environment, the permeability of the plastic concrete cutoff curtain is 0.25 m³ after 1 hour of pouring. 3 / (m 2 The permeability after 24 hours of pouring is 0.30 m·h. 3 / (m 2 The permeability after 72 hours of pouring is 0.316 m·h. 3 / (m 2As can be seen from the data (·m·h), the performance of the cutoff curtain deteriorates early under dynamic water conditions. After the cutoff curtain material has fully set, the permeability is basically stable, and it tends to stabilize over time. The permeability of the cutoff curtain after 72 hours of dynamic water environment permeability testing is 1.89 times that of the cutoff curtain after 72 hours of standard curing, indicating that dynamic water environment has a significant early deterioration and seepage damage effect on the cutoff curtain.

[0108] Table 1. Test parameters for early deterioration and seepage damage of the cutoff curtain.

[0109] Serial Number Test time T Recording time Δt <![CDATA[Leakage volume Q T > <![CDATA[Permeability q T > 1 1h 1h 0.3 0.25 2 24h 1h 0.36 0.30 3 72h 1h 0.38 0.316 Standard maintenance conditions 72h 1h 0.2 0.167

[0110] Step fourteen, as follows Figure 1 As shown, after the leakage test under the early deterioration conditions of the water cutoff curtain is completed, the water injection pump 20 and the pressure stabilizing pump 25 are stopped, the pressure stabilizing valve 28 is opened, and the water in the post-water tank 3 and the pre-water tank 1 is released through the pressure stabilizing water pipe 29.

[0111] Step 15: Lower the hydraulic jack back to its initial position.

[0112] Step sixteen, as in 1 and Figure 2 As shown, the overlying soil and rock mass 19 was opened, the horizontal water-blocking body 17 was removed, the curtain test chamber 12 was taken out, and the curtain wall after being subjected to the action of flowing water during the early cementation process of the water-cutting curtain was taken out for appearance morphology characterization, strength testing, and microstructure analysis. The test results are shown in Table 2. Under the condition of flowing water, the appearance morphology, strength, and micropores of the plastic concrete water-cutting curtain are all lower than those under the standard curing conditions. The strength is reduced by 25%, and the porosity is increased by 34%. Under the condition of flowing water, the water flow has a greater degree of deterioration on the early performance of the curtain and the deterioration effect is obvious, which affects the safety of the water-cutting curtain.

[0113] Table 2 Performance parameters of specimens tested in early deterioration and infiltration of the cutoff curtain.

[0114] Serial Number Test time T Apparent morphology Strength / MPa micropores 1 1h 2 24h 3 72h honeycomb, pitted surface 2.46 Porosity 23.6% Standard maintenance conditions 72h flat and smooth 3.25 Porosity 17.6%

[0115] In the description of this invention, it should be noted that certain terms indicating orientation or positional relationships are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0116] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A test device for early deterioration and seepage failure of a water-cutting curtain, characterized in that, include: The pre-processor includes a pre-processor water tank and a first water pressure monitoring instrument for monitoring the water pressure inside the pre-processor water tank; The rear assembly includes a rear water tank, a second water pressure monitor, a drain pipe, a drain valve, a drain pressure gauge, and a drain flow meter. The second water pressure monitor is used to monitor the water pressure inside the rear water tank. The drain pipe is connected to the rear water tank. The drain valve is installed on the drain pipe. The drain pressure gauge is used to monitor the water pressure inside the drain pipe. The drain flow meter is used to monitor the flow rate inside the drain pipe. The outer casing has the front water tank and the rear water tank respectively disposed on opposite sides of the outer casing, and both sides of the outer casing opposite to the front water tank and the rear water tank are open. The test assembly includes a front rock and soil mass, a rear rock and soil mass, and a curtain test chamber. The curtain test chamber is located between the front rock and soil mass and the rear rock and soil mass. The curtain test chamber includes a curtain wall, a geomembrane, and clamping frames. Two clamping frames are arranged opposite each other and detachably connected. The geomembrane includes two geomembrane sheets, one end of which overlaps with each other. The geomembrane is clamped between the two clamping frames. The curtain wall is cast on both sides of the geomembrane opposite to the front and rear rock and soil masses, and the curtain wall is in a state of incomplete solidification. The shell is provided with an installation groove that matches the shape of the curtain test chamber. The curtain test chamber is disposed in the installation groove. The front rock and soil body and the rear rock and soil body are both disposed inside the shell. The front rock and soil body and the rear rock and soil body are respectively disposed opposite to the front water tank and the rear water tank. The portion of the front water tank opposite to the front rock and soil body is provided with multiple water permeable holes. Each of the water permeable holes is used to connect the front water tank and the front rock and soil body. The side of the rear water tank near the rear rock and soil body is provided with multiple water filter holes. Each of the water filter holes is used to connect the rear water tank and the rear rock and soil body. A pressurizing device is disposed inside the housing, positioned above the test assembly, and connected to the top of the housing; A horizontal water-blocking body is disposed inside the outer shell, between the pressurizing device and the test assembly, and at the top of the test assembly. The horizontal water-blocking body is used to prevent water inside the test assembly from flowing upward along the height direction of the outer shell. A load transfer assembly is disposed inside the housing and between the horizontal water barrier and the pressurizing device. The load transfer assembly includes a cover plate and an overlying soil mass. The pressurizing device abuts against the cover plate to apply a load to the cover plate. The cover plate is disposed at the top of the overlying soil mass, which is also disposed at the top of the horizontal water barrier. The overlying soil mass is used to transfer the load applied to the cover plate to the horizontal water barrier. The horizontal water barrier is capable of transferring the load applied to the cover plate to the test assembly. The water injection assembly includes a water injection pump, a water injection pressure gauge, a water injection flow meter, a water injection valve, and a water injection pipe. The water injection pump is connected to the pre-water tank through the water injection pipe. The water injection pressure gauge is used to measure the pressure of the water injection pump during the water injection process. The water injection flow meter is used to measure the flow rate of the water injection pump during the water injection process. The water injection valve is installed on the water injection pipe. The pressure stabilizing assembly includes a pressure stabilizing pump, a pressure stabilizing gauge, a pressure stabilizing flow meter, a pressure stabilizing valve, and a pressure stabilizing water pipe. The pressure stabilizing pump is connected to the downstream water tank through the pressure stabilizing water pipe. The pressure stabilizing gauge is used to measure the pressure of the pressure stabilizing pump during the pressure stabilization process. The pressure stabilizing flow meter is used to measure the flow rate of the pressure stabilizing pump during the pressure stabilization process. The pressure stabilizing valve is installed on the pressure stabilizing water pipe.

2. The test device for early deterioration and seepage damage of the water-cutting curtain according to claim 1, characterized in that, It also includes a snap-fit ​​body, which is provided along the top circumferential edge of the outer shell. The snap-fit ​​body has an inverted L-shaped cross-section and is connected to the side of the front water tank near the outer shell, the side of the rear water tank near the outer shell, and the inner wall of the outer shell.

3. The test device for early deterioration and seepage damage of the water-cutting curtain according to claim 1, characterized in that, It also includes two waterstops, both of which are set at the bottom of the horizontal water-blocking body, and the two waterstops are respectively attached to the two sides of the curtain test chamber, and each waterstop is set along the length of the curtain test chamber.

4. The test device for early deterioration and seepage failure of the water-cutting curtain according to claim 1, characterized in that, It also includes multiple pressure detection devices, all of which are evenly arranged at the top of the horizontal water barrier, and each of the pressure detection devices is used to detect the vertical pressure on the horizontal water barrier.

5. The test device for early deterioration and seepage failure of the water-cutting curtain according to claim 1, characterized in that, The foreground soil is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials; the background soil is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials; the overlying soil is made of one or more of the following: silt, fine sand, medium sand, coarse sand, gravel, pebbles, clay, loess, lime, and cementing materials.

6. The test device for early deterioration and seepage failure of a water-cutting curtain according to claim 1, characterized in that, The pressurizing device is a hydraulic jack.

7. The test device for early deterioration and seepage failure of a water-cutting curtain according to claim 1, characterized in that, The two geomembranes are connected by magnetic attraction or thermal fusion.

8. The test device for early deterioration and seepage failure of the water-cutting curtain according to claim 1, characterized in that, The curtain wall is made of one or more of the following: sand, gravel, pebbles, clay, plastic concrete, impermeable concrete, cement clay slurry, cement powder, and fly ash.

9. The test device for early deterioration and seepage failure of a water-cutting curtain according to claim 1, characterized in that, The horizontal water barrier is made of steel plate or waterproof rubber, and a steel frame is installed inside the horizontal water barrier.

10. A test method for the test device for early deterioration and seepage failure of a water-cutting curtain as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Apply vertical pressure to the load transfer component through the pressurization device to simulate the stress state of different burial depths and different overlying surrounding rocks at the construction site. Step 2: Open the water injection valve. The water injection pump will pump the external water source into the pre-water tank through the water injection pipe. The water in the pre-water tank will enter the foreground soil and the front side of the curtain test chamber through the water permeable hole. The water pressure in the pre-water tank will continuously rise. When the first water pressure monitoring instrument reaches the preset water pressure required for the test, close the water injection valve and record the pressure value of the water injection pressure gauge and the output flow rate of the water injection flow meter. Step 3: Open the pressure stabilizing valve of the pressure stabilizing pump. The pressure stabilizing pump pumps the external water source into the rear water tank through the pressure stabilizing water pipe. The water in the rear water tank enters the rear rock and soil body and the rear side of the curtain test chamber through the water filter hole. When the water pressure of the second water pressure monitor reaches the preset rear water pressure required for the test, close the water injection valve and record the pressure value of the pressure stabilizing pressure gauge and the output flow of the pressure stabilizing flow meter. Step 4: When the water in the pre-water tank enters the post-water tank through the front rock and soil body, the curtain test chamber and the rear rock and soil body in sequence, causing the pressure of the second water pressure monitor to rise, open the drain valve to reduce the water pressure in the post-water tank back to the post-preset water pressure, and record the water discharge volume of the drain flow meter. Step 5: Repeat steps 2 to 4 to keep the water pressure in the pre-tank at the pre-set water pressure and the water pressure in the post-tank at the post-set water pressure. Select multiple time periods and record the total amount of water discharged by the drainage flow meter in each time period. Analyze the water-blocking performance of the water curtain under different water pressure conditions and at different time periods based on the total amount of water discharged.

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