Particle suspension type slurry single-fracture visual grouting experiment method

Abstract

The invention discloses a particle suspension type slurry single fracture visual grouting experiment method. A particle suspension type slurry single-fracture visual grouting experiment system is used; the particle suspension type slurry single-fracture visual grouting experiment system is characterized in that the particle suspension type slurry single-fracture visual grouting experiment system comprises an experiment table, and a grouting valve and a drainage valve are arranged at the two ends of the experiment table respectively; a plurality of pneumatic joints are horizontally arranged on the surface of the experiment table in the slurry flowing direction; the grouting module comprises a liquid storage tank and an injection pump; the liquid storage tank is communicated with the injection pump; the injection pump is communicated with the grouting valve, and a pneumatic connector is arranged in the middle of the grouting pipe. The recycling module comprises a water storage bin; the water storage bin is communicated with the drain valve; the observation range of the high-speed camera covers the experiment table; a recorder; a data transmission bus; the pneumatic connector and the recorder are electrically connected to the data transmission bus; the pneumatic connector performs signal transmission through the pressure signal conversion assembly; therefore, by constructing the grouting simulation experiment system, the seepage condition of the actual grouting slurry is simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of grouting reinforcement of coal and rock masses, and in particular to a single-fracture visualization grouting experiment method for particle suspension type slurry. Background Technique

[0002] The grouting method, as an engineering technology widely used in the field of mine treatment, plays an indispensable role in engineering applications such as shaft reinforcement, roadway stability, and leakage prevention. Among them, the grouting method is a commonly used technical means to control the deformation of surrounding rocks and improve the stability of surrounding rocks. Fracture grouting refers to injecting slurry into fractured rock masses through a certain grouting pressure. As the slurry diffuses, the fracture space is continuously filled. This not only prevents the seepage of groundwater and blocks the water flow channel, but also the solidified slurry can make the fractured rock mass form a complete whole, jointly bearing the external stress to resist the deformation of the surrounding rock, greatly improving the stability and bearing capacity of the surrounding rock mass, and thus improving the mechanical properties of the rock mass structure.

[0003] At present, grouting reinforcement projects have been widely applied; however, due to the concealment of grouting projects, the development of grouting theory lags far behind engineering practice, and grouting projects, especially fracture grouting, still lack scientific theoretical guidance. For fracture grouting, most studies focus on the seepage and diffusion mechanism of slurry. Cement slurry is a slurry in a solid-liquid two-phase state, and the precipitation process of cement particles occurs during the seepage process of cement slurry. In this regard, the flow and deposition principle of cement slurry has been studied, and theoretical models such as the critical flow velocity and deposition height formula of cement particle precipitation have been obtained, but there is a lack of relevant experimental model verification. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a single-fracture visualization grouting experiment method for particle suspension type slurry in view of the above-mentioned deficiencies of the prior art. The present invention constructs a grouting simulation experiment system to simulate the seepage situation of slurry during the actual grouting process; thereby, the present invention solves the problem that the research on the precipitation mechanism of ordinary cement slurry at the present stage lacks relevant experimental method verification.

[0005] To solve the above technical problem, the technical solution adopted by the present invention is:

[0006] A single-fracture visualization grouting experiment method for particle suspension type slurry, which uses a single-fracture visualization grouting experiment system for particle suspension type slurry; the single-fracture visualization grouting experiment system for particle suspension type slurry includes:

[0007] An experimental bench, in a straight plate structure, with a grouting valve and a drainage valve respectively provided at both ends; a plurality of pneumatic joints are horizontally arranged on the surface of the experimental bench along the slurry flow direction;

[0008] The grouting module includes a liquid storage tank and an injection pump; the liquid storage tank and the injection pump are connected through a water delivery pipe; the injection pump is connected to the grouting valve through a grouting pipe, and a pneumatic joint is arranged in the middle of the grouting pipe;

[0009] The recovery module includes a water storage bin; the water storage bin is connected to the drain valve through a drain pipe;

[0010] The high-speed camera is arranged on the side of the test bench, and its observation range covers the test bench;

[0011] The recorder;

[0012] The data transmission bus;

[0013] Both the pneumatic joint and the recorder are electrically connected to the data transmission bus; among them, the pneumatic joint transmits signals through a pressure signal conversion component;

[0014] The experimental method for visual grouting of single fracture of particle suspension type slurry includes the following steps:

[0015] S1: According to different water-cement ratios, mix different colors of dyes to prepare multiple slurry samples, and confirm the theoretical values according to the critical precipitation velocity formula of cement slurry and the formula of cement particle packing height;

[0016] S2: Open the grouting valve and the drain valve, and the injection pump injects water into the grouting channel inside the test bench to make the fracture in the grouting channel in a saturated water state;

[0017] S3: After determining the fracture seepage velocity, inject different slurry samples into the grouting channel in turn; among them, the grouting process is cyclic grouting;

[0018] S4: The high-speed camera collects the diffusion path of the slurry sample in the grouting channel and the morphology of the slurry filling body at different grouting volumes and different times during the grouting process;

[0019] S5: The pressure transmitter arranged at the test bench monitors the pressure values at different positions inside the grouting channel, and exports the pressure data through the recorder;

[0020] S6: Compare the theoretical values with the actual diffusion path, the morphology of the slurry filling body and the pressure data of the test bench;

[0021] S7: According to the experimental verification results, simulate and analyze the on-site grouting situation.

[0022] Preferably, the pressure signal conversion component includes a piezometric water pipe, a pneumatic conversion head and a pressure transmitter;

[0023] Among them, the piezometric water pipe is connected to a plurality of the pneumatic connectors; the pneumatic adapter is connected to the end of the piezometric water pipe and is connected to the data transmission bus through a pressure transmitter.

[0024] Preferably, the test bench includes a front mold, a gasket, and a rear mold; the gasket is sandwiched between the front mold and the rear mold, and a grouting channel is formed among the front mold, the rear mold, and the gasket; a crack is wrapped inside the grouting channel.

[0025] Drainage holes and grouting holes are symmetrically formed at both ends of the rear mold in the left-right direction; among them, the drain valve is communicated with the grouting channel through the drainage hole; the grouting valve is communicated with the grouting channel through the grouting hole.

[0026] Preferably, vertical buffer grooves in a rectangular shape are provided at both ends of the grouting channel.

[0027] Preferably, a plurality of piezometric holes are formed inside the test bench; the pneumatic connector is connected to the piezometric hole, and the piezometric water pipe passes through the piezometric hole; one end of the piezometric water pipe passing through the test bench is connected to a pneumatic adapter.

[0028] Preferably, the pneumatic connectors provided on the surface of the test bench are distributed in a staggered manner up and down along an S-shaped route.

[0029] Preferably, the thickness of the gasket is correspondingly adjusted according to the different thicknesses of the cracks.

[0030] The present invention has the following beneficial effects:

[0031] First, the present invention provides a grouting simulation experiment system. Through the test bench composed of acrylic plates, a visual crack model is constructed. Since the height of the used crack is much larger than the width and the crack length is relatively long, the seepage and precipitation states of the slurry at different times can be intuitively observed; meanwhile, by dyeing the slurry to divide the slurries with different parameters, and then observing the slurry precipitation distribution and slurry diffusion path at different stages through a high-speed camera; thereby, the present application enables researchers to clearly obtain the seepage data of grouting in actual cracks and further improves the accuracy of the experiment.

[0032] Second, for the test bench provided by the present invention, with the help of the replaceable grouting material, after the grouting test of one kind of slurry is completed, the front mold and the rear mold can be disassembled by using the easily detachable feature of the test bench. After cleaning the grouting channel, another kind of slurry to be studied can be replaced; thereby, the present invention can realize cyclic, continuous, flexible, and highly customizable experimental research and improve the universality of the experiment.

[0033] Thirdly, the grouting simulation experiment system provided by the present invention realizes real-time dynamic monitoring and recording of the seepage precipitation pressure of cement slurry through the combined use of a pressure transmitter and a recorder; then, the recorded dynamic data is input into the theoretical model; thereby, the present invention can collect data more accurately and improve the experimental accuracy of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the grouting simulation experiment system provided by the present invention;

[0035] Figure 2 It is a front view of the experimental table provided by the present invention;

[0036] Figure 3 It is a left view of the experimental table provided by the present invention;

[0037] Figure 4 It is a right view of the experimental table provided by the present invention.

[0038] Among them: 1. Drain valve; 2. First vertical buffer tank; 3. Front mold; 4. Rear mold; 5. Experimental table; 6. Grouting body; 7. Branch pneumatic joint; 8. Second vertical buffer tank; 9. Grouting valve; 10. Grouting pipe; 11. Liquid storage tank; 12. Water delivery pipe; 13. Ball valve; 14. Injection pump; 15. Recording pneumatic joint; 16. Recording pressure measuring water pipe; 17. Recorder; 18. Computer; 19. High-speed camera; 20. Data transmission bus; 21. Branch pressure measuring water pipe; 22. Pneumatic conversion head; 23. Pressure transmitter; 24. Water storage bin; 25. Drain pipe; 26. Horizontal buffer tank; 27. Grouting channel; 28. Sealing gasket; 29. Drain hole; 30. Pressure measuring hole; 31. Grouting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be further described in detail below in conjunction with the drawings and specific preferred embodiments.

[0040] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "left side", "right side", "upper part", "lower part", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and "first", "second", etc. do not represent the importance of components, so it cannot be understood as a limitation to the present invention. The specific dimensions adopted in this embodiment are only for illustrating the technical solution and do not limit the protection scope of the present invention.

[0041] The present invention provides a grouting simulation experiment system, which includes: an experimental bench 5, having a straight plate-like structure, with a grouting valve 9 and a drain valve 1 provided at both ends thereof respectively; a plurality of pneumatic connectors are horizontally arranged on the surface of the experimental bench 5 along the slurry flow direction; a grouting module, including a liquid storage tank 11 and an injection pump 14; the liquid storage tank 11 and the injection pump 14 are communicated through a water delivery pipe 12; the injection pump 14 is communicated with the grouting valve 9 through a grouting pipe 10, and a pneumatic connector is arranged in the middle of the grouting pipe 10; a recovery module, including a water storage bin 24; the water storage bin 24 is communicated with the drain valve 1 through a drain pipe 25; a high-speed camera 19, arranged on the side of the experimental bench 5, and its observation range covers the experimental bench 5; a recorder 17; a data transmission bus 20; both the pneumatic connector and the recorder 17 are electrically connected to the data transmission bus 20; wherein, the pneumatic connector transmits signals through a pressure signal conversion component.

[0042] The pressure signal conversion component includes a pressure measuring water pipe (divided into a branch pressure measuring water pipe 21 and a recording pressure measuring water pipe 16), a pneumatic conversion head 22 and a pressure transmitter 23; wherein, the pressure measuring water pipe is connected to a plurality of pneumatic connectors (divided into a branch pneumatic connector 7 and a recording pneumatic connector 15); the pneumatic conversion head 22 is connected to the end of the corresponding pressure measuring water pipe, and both are connected to the data transmission bus 20 through the pressure transmitter 23.

[0043] The experimental bench 5 includes a front mold 3, a sealing gasket 28 and a rear mold 4; the sealing gasket 28 is clamped between the front mold 3 and the rear mold 4, and a grouting channel 27 is formed between the front mold 3, the rear mold 4 and the sealing gasket 28; a crack is wrapped inside the grouting channel 27; drain holes 29 and grouting holes 31 are symmetrically opened at both ends of the rear mold 4 left and right; wherein, the drain valve 1 is communicated with the grouting channel 27 through the drain hole 29; the grouting valve 9 is communicated with the grouting channel 27 through the grouting hole 31, and then the grouting body 6 is injected into the inside of the grouting channel 27 through the grouting hole 31.

[0044] Rectangular vertical buffer grooves are provided at both ends of the grouting channel 27, which are the first vertical buffer groove 2 and the second vertical buffer groove 8.

[0045] A plurality of pressure measuring holes 30 are opened inside the experimental bench 5; the pneumatic connector is connected at the pressure measuring hole 30, and the pressure measuring water pipe passes through the pressure measuring hole 30; one end of the pressure measuring water pipe passing through the experimental bench 5 is connected to the pneumatic conversion head 22.

[0046] The pneumatic connectors provided on the surface of the experimental bench 5 are distributed up and down in a staggered manner along an S-shaped route.

[0047] Referring to Figures 1-4 As shown, the grouting simulation experiment system provided by the present application includes four unit devices:

[0048] (1) Unit Ⅰ is the grouting module, which consists of a liquid storage tank 11, an injection pump 14, a ball valve 13, a grouting valve 9, and a grouting pipe 10. Among them, the injection pump 14 can supply water and cement slurry to be injected into the cracks by switching the ball valve 13.

[0049] This part of the device provides a stable and adjustable grouting flow rate for single-crack grouting at different flow rate levels. In addition, the injection pump 14 can monitor the grouting flow rate in real time and record the instantaneous and cumulative flow rates.

[0050] (2) Unit Ⅱ is the test bench 5, which consists of a front mold 3, a rear mold 4, gaskets 28, 8 pressure measurement holes 30, a horizontal buffer tank 26, a drain hole 29, a grouting hole 31, and related supporting facilities.

[0051] Among them, the front mold 3 consists of a horizontal buffer tank 26, a drain hole 29, and a grouting hole 31, and the rear mold 4 consists of pressure measurement holes 30 and a horizontal buffer tank 26; the front mold 3 and the rear mold 4 are connected by a gasket 28 to prevent water leakage in the model during grouting; moreover, the present invention can also change the thickness of the gasket 28 to change the single-crack thickness.

[0052] The horizontal buffer tank 26 can eliminate the structure of slurry oscillation and eddy current, making the grouting pressure stable. The pressure measurement holes 30 are evenly distributed along the upper and lower two horizontal planes of the rear mold 4 to monitor the slurry precipitation pressure at different positions. Through this unit of the present application, dynamic grouting with a constant flow rate (flow velocity) of cement slurry for a long time on a single-crack model can be achieved.

[0053] (3) Unit Ⅲ is the unit for monitoring the slurry seepage precipitation pressure and observing the seepage precipitation mode, which consists of a recorder 17, a pressure transmitter 23, a data transmission bus 20, a computer 18, a high-speed camera 19, and related supporting facilities.

[0054] In the present application, the pressure transmitter 23 is connected to the grouting pipe 10 and the pressure measurement holes 30 through a branch pneumatic joint 7. The pressure transmitter 23 is used to measure the grouting pressure data in real time, and then the data of the pressure transmitter 23 is displayed on the screen of the recorder 17 through the data transmission bus 20 for real-time monitoring and export. During the grouting process, the high-speed camera 19 is used to monitor the precipitation process of the slurry flow, and then the real-time images are exported through the connected computer 18 to facilitate the subsequent analysis of the seepage precipitation mechanism.

[0055] (4) Unit Ⅳ is the recovery module (grouting drainage storage device), which mainly consists of a drain valve 1, a drain pipe 25, and a water storage bin 24. It is used to collect the water discharged during the grouting process.

[0056] Experimental content: This application can realize the property test of particulate suspension slurry, and studies the influence of different water-cement ratios on multiple characteristics of the suspended particle slurry, including bleeding rate, shear force, shear rate, flow property, rheological property and consolidation strength.

[0057] The experiments conducted in this application involve suspended particle slurries with five different water-cement ratios, namely 1:1, 1.5:1, 2:1, 2.5:1 and 3:1. The viscosity test of the slurry was completed by a vertical cylinder rotational viscometer (SJ-L VT-1), which can measure rheological properties at different speeds. In addition, the viscometer can also measure technical parameters such as dynamic and static shear forces, flow index and consistency coefficient.

[0058] During the experiment, the proportionally mixed cement slurry was fully stirred and then poured into the measuring container, and it was ensured that the viscometer rotor was located at the center of the slurry. The operator adjusted the rotor liquid level mark to be flush with the liquid surface, then powered on, turned on the motor, adjusted the rotation speed to 3 r / min, 6 r / min, 100 r / min, 200 r / min, 300 r / min and 600 r / min, and recorded the readings at each rotation speed.

[0059] The test results show that as the water-cement ratio increases, the viscosity of the slurry gradually decreases and finally stabilizes. The measurement of the bleeding rate was carried out by the graduated cylinder method. All groups of cement slurries were stirred at high speed for the same time to eliminate the influence of the stirring time on the bleeding rate. After stirring, the bleeding rate was measured immediately. The slurry was poured into a 100 ml graduated cylinder and left standing for about 3 hours, and the bleeding rates at different water-cement ratios were recorded. The results show that the higher the water-cement ratio, the higher the bleeding rate of the slurry.

[0060] In addition, cubes were made from slurries with different water-cement ratios, and after curing, a WAW-1000D microcomputer-controlled electro-hydraulic servo universal testing machine was used for compressive strength testing to determine the consolidation strength of slurries with different water-cement ratios.

[0061] Refer to Figure 1 In this application, the experimental observations mainly include the high-speed camera 19 collecting experimental videos and the pressure transmitter 23 collecting pressure data. Among them, in this application, the experimental videos collected by the high-speed camera 19 are used to observe the morphology of the slurry filling body and the diffusion path of the slurry at different grouting volumes and different times during the grouting process. Pressure monitoring is carried out at different positions of the single fracture model through 8 pressure transmitters 23, and then the pressure data collected by the pressure transmitter 23 is exported and analyzed using the recorder 17.

[0062] The present invention also provides a grouting simulation experiment method, including the following core steps:

[0063] S1: Mix stain of different colors according to different water-cement ratios to prepare multiple slurry samples, and confirm the theoretical values according to the critical precipitation velocity formula of cement slurry and the formula of the stacking height of cement particles.

[0064] S3: Open the grouting valve 9 and the drain valve 1. The injection pump 14 injects water into the grouting channel 27 inside the test bench, so that the fissures in the grouting channel 27 are in a saturated water state.

[0065] S6: After determining the fissure seepage velocity, inject different slurry samples into the grouting channel 27 in sequence; among them, the grouting process is cyclic grouting.

[0066] S9: The high-speed camera 19 collects the diffusion path of the slurry sample in the grouting channel 27 and the morphology of the slurry filling body at different grouting volumes and different times during the grouting process.

[0067] S12: The pressure transmitter 23 installed at the test bench monitors the pressure values at different positions inside the grouting channel 27, and exports the pressure data through the recorder 17.

[0068] S15: Compare the theoretical values with the actual diffusion path, the morphology of the slurry filling body and the pressure data of the test bench.

[0069] S18: According to the experimental verification results, simulate and analyze the on-site grouting situation.

[0070] When using the grouting simulation experiment system provided by the present application, it is implemented in the following order:

[0071] (1) Pre-inject water: Use glass glue and the gasket 28 to bond the front mold 3 and the rear mold 4 tightly to ensure no water leakage; then, place it vertically and flat on the iron frame, install the grouting valve 9, the drain valve 1 and the branch pneumatic joint 7 on the acrylic test bench 5 composed of the front mold 3 and the rear mold 4, and connect the corresponding pipelines. Then, open the drain valve 1 on the left side of the fissure model, and then add water to the liquid storage tank 11 and inject it into the grouting channel 27 through the injection pump 14 to make it in a saturated water state.

[0072] (2) Determine the fissure seepage conditions to be studied, that is, the fissure width B and the seepage velocity V. At present, the grouting speed of most fissure grouting tests is relatively fast, which does not conform to the actual slurry seepage situation in engineering. Therefore, the single-fissure grouting model test adopts low-flow grouting (500 ml / h - 1500 ml / h); at the same time, due to the long grouting time, in order to prevent the precipitation of cement slurry, a stirrer is also required to be added to the liquid storage tank 11 to keep the slurry uniform all the time. The fissure width is set to 1 mm - 5 mm so that no filtration phenomenon will occur.

[0073] (3) Prepare the slurry according to the established water-cement ratio. Divide the prepared slurry into four parts, dye them with four colors, and pour the dyed slurry into the liquid storage tank 11. Then, open the grouting valve 9, set the grouting flow rate for the injection pump 14, and start the injection pump 14 to start grouting, and grout in sequence according to the four colors in a cycle. Thus, the present invention can adjust the water-cement ratio, grouting flow rate and the thickness of the gasket 28 to conduct multi-level and multi-gradient tests.

[0074] (4) Before the grouting process, connect the pressure transmitter 23 to the pressure measuring hole 30 and the grouting pipe 10, and then import the data into the recorder 17 to monitor the grouting pressure and the slurry precipitation pressure in real time. Turn on the high-speed camera 19 and connect it to the computer 18 to observe the precipitation height and seepage form of the slurry at different times and different positions. It is possible to judge the distribution of the cement slurry at different times through different colors of cement, so as to analyze how the slurry migrates.

[0075] (5) Connect the recovery module and introduce the water discharged during the grouting process into the water storage bin 24.

[0076] (6) Export the pressure data on the recorder 17. By analyzing the pressure data and the video collected by the high-speed camera 19, it is possible to compare the migration situation and precipitation shape of the slurry under different water-cement ratios and different flow rates, so as to analyze and study the composite grouting mechanism of the seepage and precipitation of ordinary cement slurry in a single fracture.

[0077] The above has described the embodiments of the present invention in detail in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A particle suspension slurry single fracture visualized grouting experimental method, which uses a particle suspension slurry single fracture visualized grouting experimental system; characterized in that: The particle suspension slurry single fracture visual grouting experimental system comprises: The test bench (5) is in a straight plate structure, and a grouting valve (9) and a drainage valve (1) are respectively provided at both ends thereof; a plurality of pneumatic joints are horizontally provided on the surface of the test bench (5) along the slurry flow direction; The grouting module comprises a liquid storage tank (11) and an injection pump (14); the liquid storage tank (11) and the injection pump (14) are connected via a water pipe (12); the injection pump (14) is connected to the grouting valve (9) via a grouting pipe (10), and the pneumatic joint is provided in the middle of the grouting pipe (10); The recovery module comprises a water storage tank (24); the water storage tank (24) is connected to the drain valve (1) via a drain pipe (25); A high-speed camera (19) is arranged on the side of the experimental platform (5), and its observation range covers the experimental platform (5); Recorder (17); Data transmission bus (20); The pneumatic connector and the recorder (17) are both electrically connected to the data transmission bus (20); wherein the pneumatic connector performs signal transmission via a pressure signal conversion component; The particle suspension slurry single fracture visual grouting experimental method comprises the following steps: S1: According to different water-cement ratios, dyes of different colors are mixed to prepare multiple slurry samples, and the theoretical values ​​are confirmed according to the formula for the critical sedimentation velocity of cement slurry and the formula for the cement particle stacking height; S2: Open the grouting valve (9) and the drainage valve (1), and use the injection pump (14) to inject water into the grouting channel (27) inside the test bench, so that the cracks in the grouting channel (27) are in a saturated state; S3: After determining the fracture seepage velocity, different slurry samples are sequentially injected into the grouting channel (27); wherein the grouting process is a cyclic grouting process; S4: a high-speed camera (19) collects the diffusion path of the slurry sample in the grouting channel (27) and the morphology of the slurry filling body at different grouting volumes and different times during the grouting process; S5: The pressure transmitter (23) provided at the test bench monitors the pressure values ​​at different positions inside the grouting channel (27), and derives the pressure data through the recorder (17); S6: Compare the theoretical values ​​with the actual diffusion path, morphology of the slurry filling body and pressure data of the test bench; S7: Based on the experimental verification results, simulate and analyze the on-site grouting situation.

2. The particle suspension slurry single fracture visual grouting experimental method according to claim 1, characterized in that: The pressure signal conversion assembly comprises a pressure measuring water pipe, a pneumatic conversion head (22) and a pressure transmitter (23); wherein the pressure measuring water pipe is connected to a plurality of pneumatic joints; the pneumatic conversion head (22) is connected to the end of the pressure measuring water pipe and is connected to the data transmission bus (20) via the pressure transmitter (23).

3. The particle suspension slurry single fracture visual grouting experimental method according to claim 2, characterized in that: The experimental platform (5) comprises a front mold (3), a sealing gasket (28) and a rear mold (4); the sealing gasket (28) is clamped between the front mold (3) and the rear mold (4), and a grouting channel (27) is formed between the front mold (3), the rear mold (4) and the sealing gasket (28); the crack is enclosed in the grouting channel (27); The two ends of the rear mold (4) are symmetrically provided with drainage holes (29) and grouting holes (31); wherein the drainage valve (1) is connected to the grouting channel (27) through the drainage hole (29); and the grouting valve (9) is connected to the grouting channel (27) through the grouting hole (31).

4. The particle suspension slurry single fracture visual grouting experimental method according to claim 3, characterized in that: Rectangular vertical buffer grooves are provided at both ends of the grouting channel (27).

5. The particle suspension slurry single fracture visual grouting experimental method according to claim 3, characterized in that: A plurality of pressure measuring holes (30) are provided inside the experimental platform (5); the pneumatic joint is connected to the pressure measuring hole (30), and the pressure measuring water pipe passes through the pressure measuring hole (30); one end of the pressure measuring water pipe passes through the experimental platform (5) and is connected to the pneumatic conversion head (22).

6. The particle suspension slurry single fracture visual grouting experimental method according to claim 3, characterized in that: The pneumatic joints provided on the surface of the experimental table (5) are staggeredly distributed up and down along an S-shaped route.

7. The particle suspension slurry single fracture visual grouting experimental method according to claim 3, characterized in that: According to the different crack thicknesses, the thickness of the sealing gasket (28) is adjusted accordingly.

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