Pipe roofing freezing test system for simulating seepage conditions

Abstract

The invention discloses a pipe roofing freezing test system for simulating seepage conditions, which comprises a test box, a freezing assembly, a seepage assembly and a data acquisition assembly, and is characterized in that the seepage assembly comprises a driving module, a water storage tank for injecting water into the test box and a drainage tank for recycling drained water in the test box, and the drainage tank is provided with a support cylinder for erecting the water storage tank; a rotary drum for filtering water is arranged in the drainage tank, a plurality of stirring shafts for stirring water are arranged in the water storage tank, a charging barrel is arranged between the water storage tank and the drainage tank, and a spiral blade for conveying water from the drainage tank into the water storage tank is arranged in the charging barrel. When seepage of underground water in sandy soil is simulated, the elevated water storage tank can be used for supplying water to the test box in a drive-free manner, and water drained from the test box after seepage flows into the drainage tank, is filtered by the rotary drum in a centrifugal manner and then is sent back to the water storage tank again, so that the effect of recycling water is achieved; therefore, the utilization efficiency of water resources is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pipe curtain freezing test simulation, in particular to a pipe curtain freezing test system for simulating seepage conditions. Background Art

[0002] The pipe curtain method is an auxiliary construction method commonly used in large-section underground tunnels. It forms a pipe curtain by pushing highly rigid steel pipes into the soil to support the excavation of the underground space. Waterstops are installed between the steel pipes to enhance the watertightness of the support, effectively improving the stability of the tunnel face and controlling surface deformation.

[0003] Under complex engineering conditions, various construction difficulties may arise, such as how to pass through existing structures and construct in unstable water-rich strata and soft soil layers. Artificial freezing construction can effectively solve the above problems. Artificial ground freezing technology uses artificial refrigeration technology to freeze water in the stratum, turning the rock and soil into frozen soil, forming a frozen curtain in the area. This not only improves the strength and stability of the soil layer, but also effectively isolates groundwater. It is a special construction technology. The pipe curtain freezing method is a special construction method that combines the pipe curtain method with artificial ground freezing technology and is suitable for construction in shallow, large-section water-rich strata. The traditional pipe curtain method usually uses water-stop buckles connected between steel pipes to stop water. The pipe curtain freezing method uses brine circulation using artificial refrigeration technology to freeze the soil in the excavation area, thereby forming a new pipe curtain and frozen soil co-supported structure. This method not only effectively improves the water-stopping ability of the structure, but also retains the advantage of the large load-bearing capacity of the pipe curtain.

[0004] A search revealed a Chinese invention patent, publication number CN112033993B, that discloses a pipe-roof freezing-like simulation test device for quantitative dynamic simulation of groundwater recharge. The device comprises a simulated test soil box, a water replenishment device, and a water discharge device. The simulated test soil box comprises two opposing side steel plates, two opposing composite panels, and a base. The water replenishment device is mounted on the side steel plates of the simulated test soil box via guide rails and channel steel, and the water discharge device is fixed to the base of the simulated test soil box. The water replenishment and discharge devices in this application are independent of each other. During the test, water continuously flows through the soil and is directly discharged. Therefore, in highly permeable media or during long-term tests, water consumption can be high and water efficiency can be low. Summary of the Invention

[0005] In view of the above-mentioned prior art, the present invention provides a pipe curtain freezing test system that simulates seepage conditions, and the main technical problem to be solved is how to ensure the water resource utilization efficiency during the test process.

[0006] To achieve the above-mentioned purpose, the technical solution of the embodiment of the present invention is implemented as follows: A pipe curtain freezing test system for simulating seepage conditions includes a test box, a freezing component, a seepage component and a data acquisition component. The seepage component includes a drive module, a water storage tank for injecting water into the test box and a drainage tank for recovering drainage in the test box. The drainage tank is provided with a support cylinder for elevating the water storage tank. The drainage tank is provided with a drum for filtering water. The water storage tank is provided with several stirring shafts for stirring the water body. A material barrel is provided between the water storage tank and the drainage tank. The material barrel is provided with a spiral blade for transporting water from the drainage tank to the water storage tank. The drive module is used to drive the stirring shaft, the spiral blade and the drum to rotate.

[0007] Furthermore, the freezing component includes a circulation box and several freezing pipes. The circulation box is provided with a water pump for circulating a refrigerant medium into the freezing pipes and a refrigeration box for cooling the cooling medium. A pipe curtain is provided in the middle of the test box, and several freezing pipes are equidistantly arranged on the inside and outside of the pipe curtain. The data acquisition component includes a temperature sensor, a data acquisition transmission instrument and a computer.

[0008] Furthermore, two mesh plates are arranged in parallel on both sides of the tube curtain inside the test box, liquid level holes are opened at the bottom ends of both sides of the test box, and liquid level pipes are fixedly connected at the two liquid level holes on both sides of the test box. Water injection holes and drainage holes are respectively opened in the middle of both sides of the test box, and water injection pipes and drainage pipes are fixedly connected at the water injection holes and drainage holes on both sides of the test box.

[0009] Furthermore, the support cylinder is fixedly connected between the water storage tank and the drainage tank, and a fixed plate is fixedly connected to the inner top of the support cylinder. The plate body of the fixed plate and the top of the drainage box are both provided with a first opening on the inner side of the support cylinder. The material barrel is fixedly connected to the support cylinder and the drainage box at the two first openings, and the drainage box and the bottom of the circulation box are fixedly connected to the same base.

[0010] Furthermore, the top of the base is fixedly connected to the casing at one side of the drainage box, the driving module includes a motor fixedly connected to the casing, the interior of the base is provided with a common cavity below the casing and the drainage box, the top of the base is provided with first through holes at both ends of the inner side of the drainage box, and the base is rotatably connected to a connecting shaft and a rotating shaft at the two first through holes.

[0011] Furthermore, the connecting shaft passes through the barrel, the spiral blade is fixedly connected to the outside of the rod body of the connecting shaft in the barrel, the top of the base is provided with a second through hole on the inner side of the casing, the bottom end of the output shaft of the motor extends into the cavity at the second through hole, the bottom end of the output shaft of the motor and the outside of the rod body of the connecting shaft in the cavity are both connected to the first pulley through a key, and the outside of the two first pulleys is provided with the same first belt.

[0012] Furthermore, the drum is fixedly connected to the top of the rotating shaft, and the bottom end of the rotating shaft and the outside of the rod body in the cavity of the connecting shaft are connected to the second pulley through a key, and the outer sleeves of the two second pulleys are provided with a second belt. The top of the drainage box is provided with a second opening above the drum, and the diameter of the second opening is larger than the diameter of the drum. The drainage box is provided with a cover plate at the second opening, and the diameter of the cover plate is larger than the diameter of the second opening. A sleeve is fixedly connected to the outer side of the bottom end of the cover plate.

[0013] Furthermore, a third opening is provided in the middle of the cover plate, and the cover plate is fixedly connected to a water inlet pipe at the third opening. A fourth opening is provided at the top of the drum, and the sleeve extends to the interior of the drum at the fourth opening. Several water filter ports are equidistantly provided on the outside of the drum, and the drum is fixedly connected to a filter screen at the water filter ports. Several mounting holes are equidistantly provided on the outside of the cover plate, and the cover plate is provided with bolts at the mounting holes. The drainage box is provided with a threaded groove matching the bolts at the bottom of the mounting hole.

[0014] Furthermore, a water outlet is provided at the bottom end of one side of the water tank, and a water outlet pipe is fixedly connected to the water tank at the water outlet. A third through hole is provided at the top of the water tank, and the top of the connecting shaft extends to the outside of the water tank at the third through hole. The top of the connecting shaft is connected to the driving wheel through a key, and a number of fourth through holes are equidistantly provided at the outside of the top of the water tank. The stirring shaft is rotatably connected to the water tank at the fourth through hole, and the top of the stirring shaft is connected to a driven wheel meshing with the driving wheel through a key.

[0015] Furthermore, a plurality of blades in an inclined state are fixedly connected to the outside of the stirring shaft at equal intervals.

[0016] The beneficial effects of the present invention are: 1. When simulating the seepage of groundwater in sandy soil, the present application utilizes an elevated water storage tank to supply water to the test chamber in an undriven manner. The water discharged from the test chamber after infiltration flows into a drainage tank and, after centrifugal filtration through a rotating drum, is returned to the water storage tank, thereby achieving the effect of recycling water and ensuring efficient water resource utilization. Furthermore, the water returning to the water storage tank is rapidly heated up by the stirring of the agitator shaft and the action of the heating pipe, thereby ensuring a constant temperature of the water input into the test chamber and preventing frozen pipes in the test chamber from continuously lowering the temperature of the circulating water flow, making the simulation more realistic and the test results more reliable. 2. By setting up the cover plate, after it is installed on the drainage box, the sleeve and the water inlet pipe can be extended into the drum. The former can support the drum to maintain its stability during rotation, and the latter can ensure that the water discharged from the test box can smoothly enter the drum. After removing the cover plate from the drainage box, the drum can be exposed, which is convenient for cleaning after removal, thereby maintaining the effect of water filtration and recycling. 3. By setting inclined blades on the outside of the stirring shaft, when the stirring shaft rotates in the water tank, the blades can produce a greater stirring effect on the water, so that the water returning from the material pipe to the water tank can be quickly heated up to ensure the constant temperature of the water input into the test chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a pipe curtain freezing test system simulating seepage conditions in Example 1 of the present application; Figure 2 A cross-sectional view of a permeation assembly of a pipe curtain freezing test system simulating seepage conditions in Example 1 of the present application; Figure 3 A cross-sectional view of a test box of a pipe curtain freezing test system simulating seepage conditions in Example 1 of the present application; Figure 4 A three-dimensional diagram of a rotating drum of a pipe curtain freezing test system simulating seepage conditions in Example 1 of the present application; Figure 5 This is a cross-sectional view of a permeation component of a pipe curtain freezing test system that simulates seepage conditions in Example 2 of the present application.

[0018] Description of Figure Numbers: Test box 1, water injection pipe 101, liquid level pipe 102, pipe curtain 103, mesh plate 104, drain pipe 105, circulation box 2, water storage tank 3, water outlet pipe 4, support cylinder 5, fixing plate 501, base 6, casing 7, motor 701, drain box 8, driving wheel 9, driven wheel 10, stirring shaft 11, blade 1101, barrel 12, spiral blade 13, connecting shaft 14, cover plate 15, bolt 16, sleeve 17, water inlet pipe 18, rotating drum 19, filter screen 1901, second pulley 20, rotating shaft 21, second belt 22, first belt 23, first pulley 24. DETAILED DESCRIPTION

[0019] The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the present invention description are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0020] Example 1 Refer to the attached Figure 1-4The present application provides a pipe curtain freezing test system for simulating seepage conditions, including a test box 1, a freezing component, a seepage component and a data acquisition component. The size of the test box 1 is as follows: the seepage component includes a driving module, a water storage tank 3 for injecting water into the test box 1 and a drainage box 8 for recovering the drainage in the test box 1. The drainage box 8 is provided with a support cylinder 5 for raising the water storage tank 3. The outlet pipe 4 and the drainage box 8 are connected to the water injection pipe 101 and the drainage pipe 105 respectively through connecting pipes, and the outlet pipe 4, the drainage box 8, the water injection pipe 101 and the drainage pipe 105 are connected to each other. There are valves in them. After raising the water tank 3, you only need to open the valve in the outlet pipe 4 to let the water in the water tank 3 flow out by gravity. Water can be poured into the test box 1 without using a driving method. The drainage tank 8 is provided with a drum 19 for filtering water, and the water tank 3 is provided with several stirring shafts 11 for stirring the water body. A barrel 12 is provided between the water tank 3 and the drainage tank 8. The barrel 12 is provided with a spiral blade 13 for transporting water from the drainage tank 8 to the water tank 3. The driving module is used to drive the stirring shaft 11, the spiral blade 13 and the drum 19 to rotate.

[0021] Preferably, the freezing component includes a circulation box 2 and several freezing pipes. The circulation box 2 is provided with a water pump for circulating a refrigerant medium into the freezing pipes and a refrigeration box for cooling the cooling medium. The refrigeration capacity of the refrigeration box is in the range of 15-25KW, the model is TMS9025-15K, the temperature is as low as -40°C, and the maximum circulation flow rate is 50L / min. The water pump is connected to each freezing pipe through a diverter and several refrigeration pipes, and the branch flow is controlled by a valve to ensure that the brine flow of each branch is relatively balanced, and insulation cotton is provided on the outside of the diverter and the refrigeration pipe to reduce the loss of cold. A pipe curtain 103 is provided in the middle of the test box 1. The pipe curtain 103 is a steel pipe, and several freezing pipes are equidistantly arranged on the inside and outside of the pipe curtain 103. The data acquisition component includes a temperature sensor, a DAQM-4203 data acquisition transmitter and a computer. The temperature sensor is a T-type thermocouple.

[0022] Preferably, two mesh plates 104 are arranged in parallel on both sides of the pipe curtain 103 inside the test box 1, and the space between the two adjacent mesh plates 104 is used to hold permeable stones, so that water can flow into the space where the sand is located more evenly, and the sand cannot flow out through the permeable stones. Liquid level holes are provided at the bottom ends of both sides of the test box 1, and liquid level pipes 102 are fixedly connected at the two liquid level holes on both sides of the test box 1. The liquid level pipes 102 use the principle of communicating vessels to display the water levels on both sides of the inside of the test box 1, so as to facilitate the calculation and control of the seepage rate. Water injection holes and drainage holes are respectively provided in the middle of both sides of the test box 1, and water injection pipes 101 and drainage pipes 105 are fixedly connected at the water injection holes and drainage holes on both sides of the test box 1.

[0023] Preferably, the support cylinder 5 is fixedly connected between the water storage tank 3 and the drainage tank 8, and a fixing plate 501 is fixedly connected to the inner top of the support cylinder 5. The plate body of the fixing plate 501 and the top of the drainage tank 8 are both provided with a first opening on the inner side of the support cylinder 5. The barrel 12 is fixedly connected to the support cylinder 5 and the drainage tank 8 at the two first openings. The drainage tank 8 and the bottom of the circulation box 2 are fixedly connected to the same base 6. Therefore, although the drainage tank 8 is elevated, which will cause its center of gravity to increase and there is a possibility of instability, the gravity of the circulation box 2 can compress the base 6, so that it can provide support for the water storage tank 3, thereby maintaining the stability of the water storage tank 3 during use.

[0024] Preferably, the top of the base 6 is fixedly connected to the housing 7 at one side of the drainage box 8, the driving module includes a motor 701 fixedly connected to the housing 7, the interior of the base 6 is provided with a same cavity below the housing 7 and the drainage box 8, the top of the base 6 is provided with first through holes at both ends of the inner side of the drainage box 8, and the base 6 is rotatably connected to the connecting shaft 14 and the rotating shaft 21 at the two first through holes.

[0025] Preferably, the connecting shaft 14 passes through the barrel 12, the spiral blade 13 is fixedly connected to the outside of the rod body of the connecting shaft 14 in the barrel 12, the top of the base 6 is provided with a second through hole on the inner side of the casing 7, the bottom end of the output shaft of the motor 701 extends into the cavity at the second through hole, the bottom end of the output shaft of the motor 701 and the outside of the rod body of the connecting shaft 14 in the cavity are both connected to the first pulley 24 through a key, the outside of the two first pulleys 24 is provided with the same first belt 23, and the transmission ratio of the two first pulleys 24 is the same.

[0026] Preferably, the drum 19 is fixedly connected to the top of the rotating shaft 21, and the bottom end of the rotating shaft 21 and the outside of the rod body of the connecting shaft 14 in the cavity are connected to the second pulley 20 through a key, and the outer sleeve of the two second pulleys 20 is provided with a second belt 22. The top of the drainage box 8 is provided with a second opening above the drum 19, and the diameter of the second opening is larger than the diameter of the drum 19. The drainage box 8 is provided with a cover plate 15 at the second opening, and the diameter of the cover plate 15 is larger than the diameter of the second opening. A sleeve 17 is fixedly connected to the outer side of the bottom end of the cover plate 15, and the transmission ratio of the two second pulleys 20 is the same.

[0027] Preferably, a third opening is opened in the middle of the plate body of the cover plate 15, and the cover plate 15 is fixedly connected to the water inlet pipe 18 at the third opening. A fourth opening is opened at the top of the drum 19, and the sleeve 17 extends to the interior of the drum 19 at the fourth opening. Several water filter ports are opened at equal intervals on the outside of the drum 19, and the drum 19 is fixedly connected to the filter screen 1901 at the water filter port. Several mounting holes are opened at equal intervals on the outside of the cover plate 15, and the cover plate 15 is provided with bolts 16 at the mounting holes. The drainage box 8 is provided with a threaded groove compatible with the bolts 16 at the bottom of the mounting hole.

[0028] Preferably, a water outlet is provided at the bottom end of one side of the water tank 3, and the water tank 3 is fixedly connected to the water outlet pipe 4 at the water outlet. A third through hole is provided at the top of the water tank 3, and the top of the connecting shaft 14 extends to the outside of the water tank 3 at the third through hole. The top of the connecting shaft 14 is connected to the driving wheel 9 through a key, and several fourth through holes are equidistantly provided at the outside of the top of the water tank 3. The stirring shaft 11 is rotatably connected to the water tank 3 at the fourth through hole, and the top of the stirring shaft 11 is connected to the driven wheel 10 meshing with the driving wheel 9 through a key.

[0029] Working Principle: When using this device to conduct a pipe curtain freezing test simulating seepage conditions, a layered sand filling method can be used. First, the freezing pipes and pipe curtain 103 are arranged, and then the sand filling is compacted. A temperature sensor is placed during the sand filling process. Next, permeable stones are placed between two adjacent mesh panels 104, and water is injected into the space outside the two sets of mesh panels 104. After that, the entire test system can be started. During the test, the water in the test box 1 will gradually penetrate the permeable stone into the sand. Therefore, after connecting the outlet pipe 4 and the inlet pipe 18 to the water injection pipe 101 and the drain pipe 105 respectively through the connecting pipes, the valves in the above four can be opened. At this time, the elevated water storage tank 3 can inject water into the test box 1 in a non-driven manner, so that the seepage water in the test box 1 can form a liquid flow, that is, gradually flow from the water injection pipe 101 to the drain pipe 105. At the same time, the refrigeration box and the water pump in the circulation box 2 are running at the same time, and can circulate the cooling medium to the freezing pipe through the diverter and the refrigeration pipeline to cool the sand and achieve freezing. The water discharged from the drain pipe 105 flows into the drum 19 in the drainage box 8 through the water inlet pipe 18. At this time, the motor 701 can be started. The motor 701 can drive the connecting shaft 14 to rotate through the first belt 23 and the two first pulleys 24, and the connecting shaft 14 can drive the rotating shaft 21 to rotate through the second belt 22 and the two second pulleys 20. The rotating shaft 21 drives the drum 19 to rotate, and can use centrifugal force to filter the water flowing into it, and throw the filtered water into the drainage box 8. At the same time, the rotation of the connecting shaft 14 can drive the spiral blade 13 to rotate, so the spiral blade 13 can draw the water in the drainage box 8 into the barrel 12 and send it back to the water storage tank 3 from bottom to top, thereby realizing the recycling of the water. When the connecting shaft 14 rotates, it can also drive the driving wheel 9 to rotate, and the driving wheel 9 can drive the stirring shaft 11 to rotate through the driven wheel 10 to stir the water in the water tank 3. At the same time, with the heating of the water by the heating pipe, the water transported from the barrel 12 to the water tank 3 can be quickly heated up, thereby ensuring that the water input into the test chamber 1 from the water tank 3 can maintain a constant temperature, and preventing the freezing of the pipe from continuously lowering the temperature of the circulating water flow; After the test is completed, the refrigeration box and water pump, motor 701 and valves in the water outlet pipe 4, water inlet pipe 18, water injection pipe 101 and drainage pipe 105 in the circulation box can be closed. Then, after loosening the bolts 16, the cover 15 together with the sleeve 17 and the water inlet pipe 18 can be removed. At this time, the drum 19 in the drainage box 8 can be exposed, so that it can be disassembled and cleaned.

[0030] Example 2 Refer to the attached Figure 5 The present application provides a pipe curtain freezing test system that simulates seepage conditions. Compared with Example 1, in order to enhance the stirring effect on the water body in the water tank 3, a plurality of blades 1101 in an inclined state are fixedly connected to the outside of the stirring shaft 11 at equal intervals.

[0031] Working principle: When the stirring shaft 11 rotates to stir the water in the water tank 3, the blades 1101 can increase the range of the stirring shaft 11 stirring the water and generate more turbulence. Therefore, the blades 1101 can enhance the stirring effect of the stirring shaft 11 on the water and further promote the rapid temperature recovery of the water entering the water tank 3, so as to ensure the constant temperature effect of the water input into the test box.

[0032] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this invention should be included in the scope of protection of the present invention. The scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A pipe curtain freezing test system for simulating seepage conditions, comprising a test box (1), a freezing component, a seepage component and a data acquisition component, characterized in that: The seepage assembly comprises a driving module, a water storage tank (3) for injecting water into the test box (1), and a drainage tank (8) for recovering drainage in the test box (1); the drainage tank (8) is provided with a support cylinder (5) for raising the water storage tank (3); the drainage tank (8) is provided with a drum (19) for filtering water; the water storage tank (3) is provided with a plurality of stirring shafts (11) for stirring the water body; a barrel (12) is provided between the water storage tank (3) and the drainage tank (8); the barrel (12) is provided with a spiral blade (13) for transporting water from the drainage tank (8) to the water storage tank (3); and the driving module is used to drive the stirring shaft (11), the spiral blade (13) and the drum (19) to rotate.

2. A pipe curtain freezing test system simulating seepage conditions according to claim 1, characterized in that: The freezing assembly includes a circulation box (2) and a plurality of freezing pipes. The circulation box (2) is provided with a water pump for circulating a refrigeration medium into the freezing pipes and a refrigeration box for cooling the cooling medium. A pipe curtain (103) is provided in the middle of the test box (1). The plurality of freezing pipes are equidistantly arranged on the inner and outer sides of the pipe curtain (103). The data acquisition assembly includes a temperature sensor, a data acquisition transmission instrument, and a computer.

3. A pipe curtain freezing test system simulating seepage conditions according to claim 2, characterized in that: Two mesh plates (104) are arranged in parallel on both sides of the tube curtain (103) inside the test box (1), liquid level holes are opened at the bottom ends of both sides of the test box (1), and liquid level pipes (102) are fixedly connected at the two liquid level holes on both sides of the test box (1), and water injection holes and drainage holes are respectively opened at the middle of both sides of the test box (1), and water injection pipes (101) and drainage pipes (105) are fixedly connected at the water injection holes and drainage holes on both sides of the test box (1).

4. A pipe curtain freezing test system for simulating seepage conditions according to claim 3, characterized in that: The support cylinder (5) is fixedly connected between the water storage tank (3) and the drainage tank (8); a fixing plate (501) is fixedly connected to the top end of the inner portion of the support cylinder (5); a first opening is provided on the plate body of the fixing plate (501) and the top end of the drainage tank (8) on the inner side of the support cylinder (5); the material cylinder (12) is fixedly connected to the support cylinder (5) and the drainage tank (8) at the two first openings; the drainage tank (8) and the bottom of the circulation tank (2) are fixedly connected to the same base (6).

5. A pipe curtain freezing test system for simulating seepage conditions according to claim 4, characterized in that: The top of the base (6) is fixedly connected to the housing (7) at one side of the drainage box (8); the drive module includes a motor (701) fixedly connected to the housing (7); the interior of the base (6) is provided with a common cavity below the housing (7) and the drainage box (8); the top of the base (6) is provided with first through holes at both ends of the inner side of the drainage box (8); the base (6) is rotatably connected to a connecting shaft (14) and a rotating shaft (21) at the two first through holes.

6. A pipe curtain freezing test system for simulating seepage conditions according to claim 5, characterized in that: The connecting shaft (14) passes through the barrel (12), the spiral blade (13) is fixedly connected to the outside of the rod body of the connecting shaft (14) in the barrel (12), the top of the base (6) is provided with a second through hole on the inner side of the housing (7), the bottom end of the output shaft of the motor (701) extends into the cavity at the second through hole, the bottom end of the output shaft of the motor (701) and the outside of the rod body of the connecting shaft (14) in the cavity are both connected to the first pulley (24) through a key, and the outside of the two first pulleys (24) is provided with the same first belt (23).

7. A pipe curtain freezing test system for simulating seepage conditions according to claim 5, characterized in that: The rotating drum (19) is fixedly connected to the top of the rotating shaft (21), and the bottom end of the rotating shaft (21) and the outside of the rod body of the connecting shaft (14) in the cavity are connected to the second pulley (20) through a key, and the two second pulleys (20) are provided with a second belt (22) on the outside. The top of the drainage box (8) is provided with a second opening above the rotating drum (19), and the diameter of the second opening is larger than the diameter of the rotating drum (19). The drainage box (8) is provided with a cover plate (15) at the second opening, and the diameter of the cover plate (15) is larger than the diameter of the second opening. The outer side of the bottom end of the cover plate (15) is fixedly connected to a sleeve (17).

8. A pipe curtain freezing test system for simulating seepage conditions according to claim 7, characterized in that: A third opening is provided in the middle of the cover plate (15), and a water inlet pipe (18) is fixedly connected to the cover plate (15) at the third opening. A fourth opening is provided at the top of the rotary drum (19), and the sleeve (17) extends to the interior of the rotary drum (19) at the fourth opening. A plurality of water filter openings are equidistantly provided on the outside of the rotary drum (19), and a filter screen (1901) is fixedly connected to the water filter openings of the rotary drum (19). A plurality of mounting holes are equidistantly provided on the outside of the cover plate (15), and bolts (16) are provided at the mounting holes of the cover plate (15). A threaded groove matching the bolts (16) is provided at the bottom of the mounting hole of the drain box (8).

9. The pipe curtain freezing test system for simulating seepage conditions according to claim 5, characterized in that: A water outlet is provided at the bottom end of one side of the water tank (3), and a water outlet pipe (4) is fixedly connected to the water outlet of the water tank (3). A third through hole is provided at the top end of the water tank (3), and the top end of the connecting shaft (14) extends to the outside of the water tank (3) at the third through hole. The top end of the connecting shaft (14) is connected to a driving wheel (9) via a key. A plurality of fourth through holes are provided at equal intervals on the outside of the top end of the water tank (3), and the stirring shaft (11) is rotatably connected to the water tank (3) at the fourth through hole. The top end of the stirring shaft (11) is connected to a driven wheel (10) meshing with the driving wheel (9) via a key.

10. A pipe curtain freezing test system for simulating seepage conditions according to claim 9, characterized in that: A plurality of blades (1101) in an inclined state are fixedly connected to the outside of the stirring shaft (11) at equal intervals.

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