A device and method for indoor grouting forming and impermeability performance detection of a water retaining wall

Abstract

This invention discloses a device and method for indoor grouting molding and anti-seepage performance testing of a water-retaining wall, relating to the field of water-retaining wall performance testing technology. It includes a water inlet system connected to a testing box. A cover plate is detachably fixed to the top of the testing box, and a grouting system for injecting grout into the testing box is installed on the cover plate. A water pressure monitoring system is installed inside the testing box to monitor the internal water pressure. A drainage system is installed on one side of the testing box. The distribution of the box and the grouting sleeve valves in the grouting system, as well as the coordination of the water inlet and drainage systems, enable this device to simulate the anti-seepage situation of underground continuous walls or water-stop curtains in rock and soil strata under different infiltration points, leakage points, water flow, and water pressure conditions. The water pressure monitoring system monitors the flow rate and water pressure of infiltration in front of the wall and leakage behind the wall to evaluate the anti-seepage capacity of the grout-formed water-retaining wall.

Description

Technical Field

[0001] This invention relates to the field of water-retaining wall performance testing technology, specifically to a device and method for testing the indoor grouting molding and impermeability performance of water-retaining walls. Background Technology

[0002] Water-retaining walls, also known as flood walls, are concrete or masonry structures used to intercept water flow, raise water levels, or resist floods. They are commonly found in towns, industrial and mining enterprises, and areas along rivers and coasts. Underground continuous walls and water-stop curtains are water-retaining and seepage-proof structures widely used in geotechnical engineering, water conservancy engineering, and municipal engineering. Their construction and forming process mainly involves grouting. Before practical application, it is necessary to test the grouting technology of the soil and rock mass and the permeability of the soil and rock mass before and after grouting in the laboratory.

[0003] Currently, when conducting performance tests, rock or soil columns are typically used as samples for grouting and permeability testing. However, this sampling method has certain problems. Due to the different shapes of retaining wall structures, it is not possible to conduct laboratory grouting and permeability testing on retaining wall structures such as diaphragm walls and water-stop curtains. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for indoor grouting molding and anti-seepage performance testing of water-retaining walls, which solves the technical problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A device for testing the indoor grouting molding and impermeability performance of a retaining wall includes a water inlet system connected to a testing box. The testing box is loaded with grouting soil and rock to simulate the location of seepage points in the retaining wall. A cover plate is detachably fixed to the top of the testing box to close the top of the testing box and balance the water pressure inside the testing box. A grouting system for injecting grout into the testing box is provided on the cover plate. A water pressure monitoring system for monitoring the water pressure inside the testing box is provided inside the testing box. A drainage system is provided on one side of the testing box, and the drainage system can drain water at multiple locations to simulate seepage points at different locations in the retaining wall.

[0006] As a preferred embodiment of the present invention, the water inlet system includes an inlet pipe shut-off valve, an inlet pipe flow meter, and an inlet pipe. The inlet pipe shut-off valve and the inlet pipe flow meter are sequentially arranged on the inlet pipe, and one end of the inlet pipe is connected to the detection box.

[0007] As a preferred embodiment of the present invention, the testing box includes a box body, an internal water tank, a high-pressure resistant glass plate, and a rubber sealing gasket layer. The internal water tank is located on one side of the box body, and the water inlet pipe is connected to the inside of the box body. Two high-pressure resistant glass plates are provided and located on opposite sides of the box body. The high-pressure resistant glass plates are used to observe the inside of the box body. The rubber sealing gasket layer is located on the top of the box body to seal the gap between the cover plate and the box body.

[0008] In a preferred embodiment of the present invention, the internal water storage tank includes a water tank inlet, a rubber waterproof plug, a waterproof sleeve, and a water-proof baffle. The water-proof baffle is vertically arranged inside the tank body and divides the tank body into a first chamber and a second chamber, wherein the volume of the first chamber is smaller than the volume of the second chamber. The water tank inlet is located on the tank body and communicates with the interior of the first chamber. The waterproof sleeve is located on the water-proof baffle and communicates with the interior of the second chamber. The rubber waterproof plug is located on the waterproof sleeve and is used to close or open the waterproof sleeve.

[0009] As a preferred embodiment of the present invention, the cover plate includes a box cover, a cable waterproof sealing assembly, and a grouting pipe waterproof sealing assembly. The box cover is detachably fixed to the top of the box body. The cable waterproof sealing assembly and the grouting pipe waterproof sealing assembly are both disposed on the box cover. The cable waterproof sealing assembly is used to seal the connection between the water pressure monitoring system and the box cover, and the grouting pipe waterproof sealing assembly is used to seal the connection between the grouting system and the box cover.

[0010] As a preferred embodiment of the present invention, the grouting system includes a ball valve, a main grout flow pipe, a multi-channel structure, and grouting sleeve valves. The main grout flow pipe is disposed on the box cover and extends into the second chamber. The ball valve is disposed on the main grout flow pipe. The multi-channel structure is disposed at the bottom of the main grout flow pipe to divert the grout in the main grout flow pipe into multiple channels. Multiple grouting sleeve valves are provided and are all connected to the multi-channel structure.

[0011] As a preferred embodiment of the present invention, the drainage system includes a drain pipe, a drain pipe shut-off valve, and a drain pipe flow meter. The drain pipe is disposed on the housing and extends into the housing. The drain pipe shut-off valve and the drain pipe flow meter are both disposed on the drain pipe.

[0012] As a preferred embodiment of the present invention, the water pressure monitoring system includes a shielded twisted-pair cable, a shielded hydraulic cable, and a pore water pressure gauge. The shielded twisted-pair cable is disposed on the cover of the box and extends into the second chamber. Multiple shielded hydraulic cables are provided and are all connected to the shielded twisted-pair cable. Each shielded hydraulic cable is connected to a pore water pressure gauge disposed inside the box.

[0013] A testing method for a water-retaining wall indoor grouting molding and anti-seepage performance testing device, S100, testing the water tightness of the entire device; S200, when the device is in good watertightness, two operating conditions are set to evaluate the water-blocking capacity per unit length of the retaining wall and the emergency response capability of the grouting material used in the retaining wall. The water-blocking capacity is set as K, and the emergency response capability is set as N. The two operating conditions are as follows: Operating Condition 1: Given the thickness of the retaining wall as H, the given inflow rate as Q or the inflow pressure as P, monitor the total drainage flow rate Q1 or the pressure P1 measured by the pore water pressure gauge on the drainage side of the wall when the total inflow rate Q or the inflow pressure P are reached. Condition 2: Given an inlet flow rate of Q2 or an inlet pressure of P2, and given that grouting is required to reduce the total flow rate of the drainage pipe to a threshold or the water pressure measured by the pore water pressure gauge on the drainage side to a threshold, and monitor the total amount of grout used q and the grouting time T when Q3 or P3 are reached, where the threshold for reducing the total flow rate of the drainage pipe is Q3 and the threshold for reducing the water pressure is P3.

[0014] As a preferred embodiment of the present invention, in working condition 1, the relationship for evaluating the water-blocking capacity per unit length of the retaining wall is as follows: K = (γ·Q) / (Q1·H); or: K = (γ·P) / (P1·H); Among them, γ is a value related to the soil and rock environment inside the box; In scenario 2, the formula for evaluating the emergency response capability of the grouting material used in the retaining wall is: N = (β·Q2) / (Q3·T·q); or: N = (β·P2) / (P3·T·q); Here, β is a value related to the soil and rock environment within the box.

[0015] Compared with the prior art, the present invention has the following advantages: (1) The distribution of the grouting sleeve valve pipe in the box and grouting system in this invention, as well as the coordination of the water inlet system and the drainage system, enable this device to simulate the seepage resistance of underground continuous walls or water-stop curtains in rock and soil strata under different seepage points, leakage points, water flow and water pressure conditions, and to monitor the flow rate and water pressure of seepage in front of the wall and leakage behind the wall through the water pressure monitoring system, so as to evaluate the seepage resistance of the water-stop wall formed by grouting.

[0016] (2) This invention also provides a method and formula for evaluating and quantifying the seepage resistance and emergency response capabilities of water-retaining wall structures, so that the seepage resistance of water-retaining structures and the emergency response capabilities of the grouting materials used therein can be specifically quantified. Attached Figure Description To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0017] Figure 1 A front view of the device for indoor grouting and forming of water-retaining walls and testing its impermeability provided by the present invention; Figure 2 A top view of the device for indoor grouting molding and anti-seepage performance testing of a water-retaining wall provided by the present invention; Figure 3 A schematic diagram of the overall structure of the cover plate is provided for this invention; Figure 4 A bottom view of the cover plate is provided for this invention; Figure 5 A top view of the testing box is provided for this invention; Figure 6 This invention provides a schematic diagram of the internal structure of the internal water storage tank; Figure 7 A front view of the grouting system is provided for this invention; The labels in the diagram represent the following: 1. Inlet pipe shut-off valve; 2. Inlet pipe flow meter; 3. Inlet pipe; 4. Internal water storage tank; 5. Rubber sealing gasket; 6. High-pressure resistant glass plate; 7. Shielded twisted-pair cable; 8. Shielded hydraulic cable; 9. Pore water pressure gauge; 10. Grouting system; 11. Bolt; 12. Box cover; 13. Nut; 14. Drain pipe; 15. Drain pipe shut-off valve; 16. Drain pipe flow meter; 17. Cable waterproof sealing assembly; 18. Grouting pipe waterproof sealing assembly; 20. Box body; 41. Water inlet of water storage tank; 42. Rubber waterproof plug; 43. Waterproof sleeve; 44. Waterproof baffle; 51. Box cover rubber water-stop sealing strip; 52. Box body rubber water-stop sealing strip; 101. Ball valve; 102. Main grout flow pipeline; 103. Multi-channel structure; 104. Grouting sleeve valve pipe. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 7 As shown, the present invention provides a device for indoor grouting molding and anti-seepage performance testing of a retaining wall, including a water inlet system. The water inlet system is connected to a testing box, which is loaded with grouting soil and rock to simulate the location of the seepage point of the retaining wall. A cover plate is detachably fixed to the top of the testing box, and the cover plate is used to close the top of the testing box to balance the water pressure inside the testing box. A grouting system 10 for injecting grout into the testing box is provided on the cover plate. A water pressure monitoring system for monitoring the water pressure inside the testing box is provided inside the testing box. A drainage system is provided on one side of the testing box, and the drainage system can drain water at multiple locations to simulate seepage points at different locations of the retaining wall.

[0021] The water inlet system includes an inlet pipe shut-off valve 1, an inlet pipe flow meter 2, and an inlet pipe 3. The inlet pipe shut-off valve 1 and the inlet pipe flow meter 2 are sequentially installed on the inlet pipe 3, and one end of the inlet pipe 3 is connected to the detection box.

[0022] The testing box includes a box body 20, an internal water tank 4, a high-pressure resistant glass plate 6, and a rubber sealing gasket layer 5. The internal water tank 4 is located on one side inside the box body 20, and the water inlet pipe 3 is connected to the inside of the box body 20. There are two high-pressure resistant glass plates 6 located on opposite sides of the box body 20. The high-pressure resistant glass plates 6 are used to observe the inside of the box body 20. The rubber sealing gasket layer 5 is located on the top of the box body 20 to seal the gap between the cover plate and the box body 20.

[0023] The internal water storage tank 4 includes a water tank inlet 41, a rubber waterproof plug 42, a waterproof sleeve 43, and a water-proof baffle 44. The water-proof baffle 44 is vertically installed inside the tank body 20 and divides the inside of the tank body 20 into a first chamber and a second chamber. The volume of the first chamber is smaller than the volume of the second chamber. The water tank inlet 41 is installed on the tank body 20 and communicates with the inside of the first chamber. The waterproof sleeve 43 is installed on the water-proof baffle 44 and communicates with the inside of the second chamber. The rubber waterproof plug 42 is installed on the waterproof sleeve 43 and is used to close or open the waterproof sleeve 43.

[0024] The internal water storage tank 4 is formed by drilling holes at specific positions on the water-proof baffle 44 and installing rubber waterproof sleeves 43 and rubber waterproof plugs 42 that can be inserted into the rubber waterproof sleeves 43. It forms an internal box-shaped structure with the inner wall of the water inlet side of the tank body 20 and the water inlet 41 of the water storage tank, which is the space inside the first chamber.

[0025] By controlling whether the rubber waterproof sleeves 43 at different positions are inserted into the rubber waterproof plugs 42, different combinations of infiltration points are formed when the water in the internal water storage tank 4 flows into the second chamber containing the soil and rock mass. This simulates the complex combination of multiple seepage points at different locations formed when there is pressurized water in front of the retaining wall structure in actual engineering. Furthermore, the location of the rubber waterproof sleeves 43 on the water-proof baffle 44 can be determined by drilling according to the combination of seepage points in front of the wall at different locations in actual engineering.

[0026] The cover plate includes a box cover 12, a cable waterproof sealing assembly 17, and a grouting pipe waterproof sealing assembly 18. The box cover 12 is detachably fixed to the top of the box body 20. The cable waterproof sealing assembly 17 and the grouting pipe waterproof sealing assembly 18 are both installed on the box cover 12. The cable waterproof sealing assembly 17 is used to seal the connection between the water pressure monitoring system and the box cover 12, and the grouting pipe waterproof sealing assembly 18 is used to seal the connection between the grouting system 10 and the box cover 12.

[0027] Specifically, the lid 12 can be fixed to the top of the box body 20 by bolts 11 and nuts 13, and the lid 12 can be fixed or removed by tightening or loosening the bolts 11 and screws 13.

[0028] The grouting system 10 includes a ball valve 101, a main grout flow pipe 102, a multi-channel structure 103, and grouting sleeve valve pipes 104. The main grout flow pipe 102 is installed on the box cover 12 and extends into the second chamber. The ball valve 101 is installed on the main grout flow pipe 102. The multi-channel structure 103 is installed at the bottom of the main grout flow pipe 102 to divert the grout in the main grout flow pipe 102 into multiple channels. Multiple grouting sleeve valve pipes 104 are provided and are all connected to the multi-channel structure 103.

[0029] The drainage system includes a drain pipe 14, a drain pipe shut-off valve 15, and a drain pipe flow meter 16. The drain pipe 14 is installed on the housing 20 and extends into the housing 20. The drain pipe shut-off valve 15 and the drain pipe flow meter 16 are both installed on the drain pipe 14.

[0030] The water pressure monitoring system includes a shielded twisted pair cable 7, a shielded hydraulic cable 8, and a pore water pressure gauge 9. The shielded twisted pair cable 7 is installed on the cover 12 and extends into the second chamber. Multiple shielded hydraulic cables 8 are provided and are all connected to the shielded twisted pair cable 7. Each shielded hydraulic cable 8 is connected to a pore water pressure gauge 9 installed inside the enclosure 20.

[0031] In use, the water inlet system is connected to an external water pump or pressure tank for water supply, thereby delivering water to the test chamber at the required pressure or flow rate. The water inlet pipe 3 is closed or opened by the water inlet pipe shut-off valve 1, and the water flow rate through the water inlet pipe 3 is counted by the water inlet pipe flow meter 2. The water pressure monitoring system is connected to an external data acquisition device to check whether the water inlet pipe flow meter 2 and the drain pipe flow meter 16 are reading normally. The grouting system 10 is connected to an external grouting pump.

[0032] Before the water flows through the water inlet system to the test chamber 20, the soil and rock mass is first loaded into the chamber 20. Then, the grouting pump, ball valve 101, and corresponding grouting sleeve valve pipe 104 are opened, so that the prepared grout flows into the multi-channel structure 103 through the grout main pipe 102 and is injected into the soil and rock mass through the corresponding grouting sleeve valve pipe 104. When the thickness of the grout wall reaches H, the grouting is stopped and the ball valve 101 is closed.

[0033] According to the experimental requirements, pull out the rubber waterproof plug 42 at the corresponding position to simulate the seepage point in front of the wall in the actual project, and close the drain pipe shut-off valve 15 that needs to be closed to simulate the seepage point behind the wall in the actual project. At this time, open the water inlet shut-off valve 1 to inject water into the box 20, and adjust the water inlet flow rate or water inlet pressure of the external water pump or pressure tank to the experimental requirements.

[0034] During the experiment, the readings of the inlet pipe flow meter 2, the outlet pipe flow meter 16, and the pore water pressure meter 9 were continuously collected. When the reading of the pore water pressure meter 9 on the inlet side inside the tank 20 reached the water pressure of the external pressure tank or the reading of the inlet pipe flow meter 2 reached the water flow rate of the water pump, the water injection was stopped. The water pressure collected by the outlet pipe pore water pressure meter 9 or the total flow rate of all outlet pipe flow meters 16 were read by the external data acquisition device. The performance of the water retaining wall was evaluated based on these data.

[0035] The internal water storage tank 4 is used to select and remove different rubber waterproof plugs 42 during use to form water infiltration points in different locations for the soil and rock inside the tank body 20.

[0036] The grouting system 10 uses a combination of a multi-channel structure 103 and multiple grouting sleeve valves 104 to disperse the grout input into the main grouting pipe 102, so as to form a wall-shaped water-retaining structure (i.e., a water-retaining wall) in the grouting rock and soil.

[0037] The drainage system opens the drain pipe shut-off valves 15 at different locations according to the experimental requirements to simulate the seepage points behind the water retaining wall in actual engineering, and collects the water flow rate through each seepage point through the drain pipe flow meter 16.

[0038] The water pressure monitoring system monitors the water pressure inside the tank to reflect the changes in water pressure at different locations within the tank 20 before and after grouting.

[0039] In this embodiment, the rubber sealing gasket layer 5 includes a box cover rubber water-stop sealing strip 51 and a box body rubber water-stop sealing strip 52. The box cover rubber water-stop sealing strip 51 is disposed on the box cover 12, and the box body rubber water-stop sealing strip 52 is disposed on the box body 20. The box cover rubber water-stop sealing strip 51 and the box body rubber water-stop sealing strip 52 are combined to resist the high-pressure water flow inside the box body 20.

[0040] In this embodiment, the pore water pressure gauge 9 is installed at a height that is half the internal height of the housing 20.

[0041] The horizontal distance between the pore water pressure gauge 9 embedded in the housing 20 and the grouting system 10 is L. Before the device is used, the value of L must be set to half the thickness of the retaining wall so that the grout cannot diffuse through the pore water pressure gauge 9, thereby blocking the water flow around the pore water pressure gauge 9 and affecting the pore water pressure gauge 9 in measuring the water pressure or flow rate of the soil and rock environment in front of or behind the retaining wall that has not been grouted.

[0042] When implementing certain working conditions, since the thickness of the retaining wall cannot be set in advance, the pore water pressure gauges 9 at both ends are placed near the two end faces inside the box 20 where the rock and soil are placed, so that L reaches the maximum settable value.

[0043] In this embodiment, multiple grouting sleeve valves 104 are arranged in a single row, or in a double row, to improve the diffusion of the injected grout.

[0044] This invention also provides a testing method for a water-retaining wall indoor grouting molding and impermeability testing device, comprising the following steps: S100, testing the water tightness of the entire device; S200, when the device is in good watertightness, two operating conditions are set to evaluate the water-blocking capacity per unit length of the retaining wall and the emergency response capability of the grouting material used in the retaining wall. The water-blocking capacity is set as K, and the emergency response capability is set as N. The two operating conditions are as follows: Operating Condition 1: Given the thickness of the retaining wall as H, the given inflow rate as Q or the inflow pressure as P, monitor the total drainage flow rate Q1 when the total inflow rate Q is reached or the inflow pressure P is measured by the pore water pressure gauge 9 in front of the wall or the pressure P1 measured by the pore water pressure gauge 9 on the drainage side behind the wall. Condition 2: Given an inlet flow rate of Q2 or an inlet pressure of P2, and given that grouting is required to reduce the total flow rate of the drainage pipe 14 to a threshold or the water pressure measured by the pore water pressure gauge 9 on the drainage side to a threshold, and monitor the total amount of grout used q and the grouting time T when Q3 or P3 are reached, where the threshold for reducing the total flow rate of the drainage pipe 14 is Q3 and the threshold for reducing the water pressure is P3.

[0045] In operating condition 1, the formula for evaluating the water-blocking capacity per unit length of the retaining wall is: K = (γ·Q) / (Q1·H); or: K = (γ·P) / (P1·H); Wherein, γ is a value related to the soil and rock environment within box 20; In scenario 2, the formula for evaluating the emergency response capability of the grouting material used in the retaining wall is: N = (β·Q2) / (Q3·T·q); or: N = (β·P2) / (P3·T·q); Here, β is a value related to the soil and rock environment within the box 20.

[0046] For step S100, the steps for detecting the water tightness of the device are as follows: S101, The rock and soil mass required for the experiment or simulating the actual engineering strata is loaded into the box 20; S102, the grouting sleeve valve pipe 104 is buried in the box, and the length of the grouting sleeve valve pipe 104 is required to be consistent with the internal height of the box 20; S103, pore water pressure gauges 9 are installed at both ends of the grouting sleeve valve pipe 104 at a distance greater than 1 / 2 of the thickness of the retaining wall; S104, the cover 12 is sealed to the box body 20 by bolts 11, nuts 13 and the cover rubber water-stop sealing strip 51. The grout flow main pipe 102 extends out of the cover 12 through the grouting pipe waterproof sealing assembly 18 on the cover 12 and is connected to the multi-channel structure 103 through the grouting sleeve valve pipe 104. The pore water pressure gauge 9 is connected to the shielded twisted pair cable 7 through the shielded hydraulic cable 8, and the shielded twisted pair cable 7 is pulled to the external data acquisition device through the cable waterproof sealing assembly 17 on the cover 12. S105, close the ball valve 101 of the grouting system 10, open the drain pipe shut-off valve 15 of the top drain pipe 14 of the box 20, keep the drain pipe shut-off valves 15 of the other drain pipes 14 closed, pull out all the rubber waterproof plugs 42 of the water storage tank 4 inside the box 20, connect the water inlet pipe 3 of the water inlet system to the external water pump or pressure tank, open the water inlet pipe shut-off valve 1 of the water inlet system, and let water enter the box 20 at a relatively slow flow rate. S106: When water flows out of the top drain pipe 14, but no water flows out of the rest of the device, close the drain pipe shut-off valve 15 of the top drain pipe 14. At this time, the port of the grout flow main pipeline 102 of the grouting system 10 is not connected to the external grouting pump, and open the ball valve 101 of the grouting system 10. S107, when water flows out of the main pipeline 102 and no water flows out in other parts of the entire device, close the ball valve 101 of the grouting system 10; S108, continue to supply water into the tank 20 through the water inlet system, and gradually increase the water inlet flow or water pressure by adjusting the external water pump or pressure tank. The water inlet pipe flow meter 2 and the pore water pressure meter 9 in the tank can monitor the flow of the water inlet pipe 3 or the water pressure in the tank 20 in real time. S109, when the inlet pipe flow meter 2 reaches the flow rate Q x Or the water pressure gauge 9 inside the box reaches the water pressure P. x At that time, no part of the entire apparatus leaked water, indicating that the apparatus could withstand the required flow rate Q specified in the experiment. x Or pore water pressure P x The drainage system is leak-proof. Considering a safety factor, continue filling the tank 20 with water. When the inlet flow meter 2 detects an inlet flow rate greater than or equal to 2Q... x Or the water pressure collected by the pore water pressure gauge 9 inside the box is greater than or equal to 2P. x If no part of the entire device leaks water, then the device's watertightness meets the standard for conducting experiments.

[0047] S110, open the drain stop valve 15 of the top drain pipe 14 to release the water pressure in the box 20. At this time, the water tightness test of the entire device is completed. The next step is to test the performance of the grouting wall and the water retaining wall.

[0048] When conducting the test under operating condition 1, the experiment should be carried out according to the following steps: First, close the inlet pipe shut-off valve 1 of the water inlet system, open all drain pipe shut-off valves 15 of the drainage system, open the ball valve 101 of the grouting system 10, and connect the grout flow main pipe 102 to the external grouting pump. Connect the shielded twisted pair cable 7 of the water pressure monitoring system inside the box 20 to the external data acquisition device to check whether the inlet pipe flow meter 2 and the drain pipe flow meter 16 are reading normally.

[0049] The second step is to turn on the grouting pump and evenly inject the prepared grout into the soil and rock mass inside the box 20. When the thickness of the grout wall reaches H, the grouting is stopped by observing through the high-pressure resistant glass plates 6 on both sides of the box 20.

[0050] The third step is to close the ball valve 101 of the grouting system 10.

[0051] Fourth step: According to the experimental requirements, select the rubber waterproof plug 42 that needs to be pulled out of the water storage tank 4 inside the box 20 to simulate the seepage point in front of the wall in the actual project, select the drain pipe shut-off valve 15 that needs to be closed to simulate the seepage point behind the wall in the actual project, connect the inlet pipe 3 port to the external water pump or pressure tank, open the inlet pipe shut-off valve 1 to inject water, and adjust the external water pump or pressure tank to achieve the ideal water inlet flow rate Q or water inlet pressure P.

[0052] Fifth, during the water injection process, continuously collect the readings of the inlet pipe flow meter 2, the outlet pipe flow meter 16, and the pore water pressure gauges 9 at both ends of the retaining wall. When the pore water pressure gauge 9 on the inlet side of the device shows that the water pressure reaches P or the inlet pipe flow meter 2 shows that the flow rate reaches Q, turn off the external water pump and pressure tank, and stop the water injection.

[0053] The sixth step involves using an external data acquisition device to focus on reading the water pressure P1 collected by the inlet side pore water pressure gauge 9 or the total flow rate Q1 of all the drain pipe flow meters 16 when the water pressure reaches P or the flow rate displayed by the inlet pipe flow meter 2 reaches Q.

[0054] The seventh step is to evaluate the water-blocking capacity K. Due to the presence of the retaining wall, when the water pressure collected by the pore water pressure gauge 9 on the inlet side reaches P or the flow rate of the inlet pipe flow meter 2 reaches Q, the water pressure P1 collected by the pore water pressure gauge 9 in the soil and rock behind the retaining wall should be less than or equal to P, and the total flow rate Q1 of the drain pipe flow meter 16 should be less than or equal to Q. Furthermore, the value of K is positively correlated with the values ​​of Q / Q1 and P / P1, and negatively correlated with the magnitude of H. Moreover, the values ​​of Q1 and P1 will also be affected under different soil and rock environments that are being grouted. Therefore, for this device, under working condition 1, the relationship for evaluating the water-blocking capacity per unit length of the retaining wall can be given as K=(γ·Q) / (Q1·H) or K=(γ·P) / (P1·H), where γ is a value related to the soil and rock environment inside the box.

[0055] When conducting the test under operating condition 2, the experiment should be carried out according to the following steps: First, open the inlet pipe shut-off valve 1 of the water inlet system to connect the grout flow main pipe 102 to the external grouting pump, close the ball valve 101 of the grouting system 10, select the drain pipe shut-off valve 15 to be opened according to the experimental requirements to simulate the seepage point behind the wall in the actual project, and select the rubber waterproof plug 42 of the internal water storage tank 4 to be pulled out to simulate the seepage point in front of the wall in the actual project.

[0056] The second step is to check whether the shielded twisted-pair cable 7 of the water pressure monitoring system inside the housing 20 is properly connected to the external data acquisition device, and to check whether the inlet pipe flow meter 2 and the outlet pipe flow meter 16 are reading normally.

[0057] The third step is to connect the inlet pipe 3 to an external water pump or pressure tank and start filling the tank with water. During the filling process, adjust the external water pump or pressure tank to make the water flow rate reach Q2 or the water pressure reach P2.

[0058] The fourth step is to collect and monitor in real time the reading of the inlet pipe flow meter 2, which reflects the inlet water flow rate, or the reading of the pore water pressure gauge 9 on one side of the inlet pipe 3, which reflects the inlet water pressure. When the reading of the inlet pipe flow meter 2 reaches Q2 or the reading of the pore water pressure gauge 9 on the side of the inlet pipe 3 reaches P2, adjust the external water pump or pressure tank to keep the inlet water flow rate Q2 or the inlet water pressure P2 constant, start the external grouting pump, and open the ball valve 101 of the grouting system 10 to start grouting.

[0059] The fifth step is to adjust the grouting pressure of the external grouting pump during the grouting process to achieve uniform penetration and diffusion of the grout within the rock and soil, and to prevent the grout from damaging the rock and soil itself, thus forming a splitting grouting.

[0060] The sixth step is to collect and monitor in real time the total flow rate of the drainage pipe flow meter 16, which reflects the drainage flow rate behind the wall, and the reading of the pore water pressure meter 9 on the drainage side, which reflects the water pressure behind the wall. When the total flow rate of the drainage pipe flow meter 16 reaches Q3 or the reading of the pore water pressure meter 9 on the drainage side reaches P3, the external grouting pump is turned off and grouting is stopped.

[0061] Step 7: Record the total grouting time T and the total grout usage q to assess the emergency response capability N of the grouting material used in the retaining wall.

[0062] Step 7: Evaluate the emergency response capability (N) of the grouting material used in the retaining wall. Due to the presence of anti-seepage grout within the soil and rock mass, the total flow rate Q3 on the drainage side should be less than or equal to the total inflow flow rate Q2, and the water pressure P3 on the drainage side should be less than or equal to the inflow water pressure P2. Furthermore, the value of N is negatively correlated with Q2 / Q3 and P2 / P3, negatively correlated with the total grout usage p, and negatively correlated with the grouting time T. Moreover, the values ​​of p and T will be affected under different soil and rock mass environments. Therefore, for this device, under working condition 2, the formula for evaluating the emergency response capability of the grouting material used in the retaining wall is given as N=(β·Q2) / (Q3·T·q) or N=(β·P2) / (P3·T·q), where β is a value related to the soil and rock environment inside the box.

[0063] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the present invention, but these should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0064] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A device for indoor grouting forming and impermeability performance detection of a water retaining wall, comprising a water inlet system, characterized in that, The water inlet system is connected to a test box, which is loaded with grouting soil and rock and simulates the location of the seepage point of the retaining wall. The top of the test box is detachably fixed with a cover plate, which is used to close the top of the test box to balance the water pressure inside the test box. The cover plate is equipped with a grouting system (10) for grouting into the test box. The test box is equipped with a water pressure monitoring system for monitoring the water pressure inside the test box. A drainage system is provided on one side of the test box, and the drainage system can drain water at multiple locations to simulate the seepage points at different locations of the retaining wall.

2. The device for indoor grouting molding and impermeability testing of a retaining wall according to claim 1, characterized in that, The water inlet system includes an inlet pipe shut-off valve (1), an inlet pipe flow meter (2), and an inlet pipe (3). The inlet pipe shut-off valve (1) and the inlet pipe flow meter (2) are sequentially installed on the inlet pipe (3), and one end of the inlet pipe (3) is connected to the detection box.

3. The device for indoor grouting and impermeability testing of a retaining wall according to claim 2, characterized in that, The testing box includes a box body (20), an internal water tank (4), a high-pressure resistant glass plate (6), and a rubber sealing gasket layer (5). The internal water tank (4) is located on one side inside the box body (20), and the water inlet pipe (3) is connected to the inside of the box body (20). There are two high-pressure resistant glass plates (6) located on opposite sides of the box body (20). The high-pressure resistant glass plates (6) are used to observe the inside of the box body (20). The rubber sealing gasket layer (5) is located on the top of the box body (20) to seal the gap between the cover plate and the box body (20).

4. The device for indoor grouting molding and impermeability testing of a retaining wall according to claim 3, characterized in that, The internal water tank (4) includes a water tank inlet (41), a rubber waterproof plug (42), a waterproof sleeve (43), and a water-proof baffle (44). The water-proof baffle (44) is vertically installed inside the tank body (20) and divides the inside of the tank body (20) into a first chamber and a second chamber. The volume of the first chamber is smaller than the volume of the second chamber. The water tank inlet (41) is installed on the tank body (20) and communicates with the inside of the first chamber. The waterproof sleeve (43) is installed on the water-proof baffle (44) and communicates with the inside of the second chamber. The rubber waterproof plug (42) is installed on the waterproof sleeve (43) and is used to close or open the waterproof sleeve (43).

5. The device for indoor grouting molding and impermeability testing of a retaining wall according to claim 1, characterized in that, The cover plate includes a box cover (12), a cable waterproof sealing assembly (17), and a grouting pipe waterproof sealing assembly (18). The box cover (12) is detachably fixed to the top of the box body (20). The cable waterproof sealing assembly (17) and the grouting pipe waterproof sealing assembly (18) are both installed on the box cover (12). The cable waterproof sealing assembly (17) is used to seal the connection between the water pressure monitoring system and the box cover (12). The grouting pipe waterproof sealing assembly (18) is used to seal the connection between the grouting system (10) and the box cover (12).

6. The device for indoor grouting molding and impermeability testing of a retaining wall according to claim 5, characterized in that, The grouting system (10) includes a ball valve (101), a main grout flow pipe (102), a multi-channel structure (103), and a grouting sleeve valve pipe (104). The main grout flow pipe (102) is installed on the box cover (12) and extends into the second chamber. The ball valve (101) is installed on the main grout flow pipe (102). The multi-channel structure (103) is installed at the bottom of the main grout flow pipe (102) to divert the grout in the main grout flow pipe (102) into multiple channels. The grouting sleeve valve pipe (104) is provided in multiple ways and is connected to the multi-channel structure (103).

7. The device for indoor grouting and impermeability testing of a retaining wall according to claim 3, characterized in that, The drainage system includes a drain pipe (14), a drain pipe shut-off valve (15), and a drain pipe flow meter (16). The drain pipe (14) is installed on the housing (20) and extends into the housing (20). The drain pipe shut-off valve (15) and the drain pipe flow meter (16) are both installed on the drain pipe (14).

8. The device for indoor grouting and impermeability testing of a retaining wall according to claim 3, characterized in that, The water pressure monitoring system includes a shielded twisted pair cable (7), a shielded hydraulic cable (8), and a pore water pressure gauge (9). The shielded twisted pair cable (7) is mounted on the cover (12) and extends into the second chamber. Multiple shielded hydraulic cables (8) are provided and are all connected to the shielded twisted pair cable (7). Each shielded hydraulic cable (8) is connected to a pore water pressure gauge (9) located inside the enclosure (20).

9. A testing method for an indoor grouting molding and impermeability testing device for a water-retaining wall, characterized in that, Including the following steps: S100, testing the water tightness of the entire device; S200, when the device is in good watertightness, two operating conditions are set to evaluate the water-blocking capacity per unit length of the retaining wall and the emergency response capability of the grouting material used in the retaining wall. The water-blocking capacity is set as K, and the emergency response capability is set as N. The two operating conditions are as follows: Operating Condition 1: Given the thickness of the retaining wall as H, the given inflow rate as Q or the inflow pressure as P, monitor the total drainage flow rate Q1 when the total inflow rate Q or the inflow pressure P is measured by the pore water pressure gauge (9) in front of the wall or the pressure P1 measured by the pore water pressure gauge (9) on the drainage side of the wall. Condition 2: Given an inlet flow rate of Q2 or an inlet pressure of P2, and given that the total flow rate of the drain pipe (14) needs to be reduced to a threshold or the water pressure measured by the pore water pressure gauge (9) on the drain side needs to be reduced to a threshold through grouting operation, and monitor the total amount of grout used q and the grouting time T when Q3 or P3 is reached, where the threshold for the reduction of the total flow rate of the drain pipe (14) is Q3 and the threshold for the reduction of the water pressure is P3.

10. The testing method for the indoor grouting molding and impermeability testing device for a water-retaining wall according to claim 9, characterized in that, In operating condition 1, the formula for evaluating the water-blocking capacity per unit length of the retaining wall is: K = (γ·Q) / (Q1·H); or: K = (γ·P) / (P1·H); Wherein, γ is a value related to the soil and rock environment inside the box (20); In scenario 2, the formula for evaluating the emergency response capability of the grouting material used in the retaining wall is: N = (β·Q2) / (Q3·T·q); or: N = (β·P2) / (P3·T·q); Wherein, β is a value related to the soil and rock environment inside the box (20).

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