Single-fracture high-pressure grouting test system and method capable of simulating properties of various grout

Abstract

The invention relates to the technical field of geotechnical engineering, and discloses a single-fracture high-pressure grouting test system capable of simulating various grout properties, which comprises a high-pressure grouting module, a grout type control module, a visual single-fracture permeation module and a data acquisition module. The high-pressure grouting module comprises a pressure slurry storage tank for storing slurry and a pressure adjusting module; a slurry outlet of the pressure slurry storage tank is connected with a liquid inlet of the visual single-fracture permeation module; and the pressure adjusting module is used for adjusting the size of the slurry outlet pressure of the pressure slurry storage tank. According to the invention, cement, water and different admixtures are separated by different chambers, so that different types of slurry are prepared, the slurry type control device is simple and more accurate to use, and the migration process of various types of slurry in cracks can be simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and particularly to a single-fracture high-pressure grouting test system and method capable of simulating various slurry properties. Background Art

[0002] In geotechnical engineering, especially in the treatment project of solid waste landfills, the leachate generated by solid waste landfills will pollute groundwater through the fractures in the rock mass. Grouting, as an effective means of plugging leakage channels, is widely used in geotechnical engineering. Through grouting technology, the slurry can be injected into the deep rock mass fractures and pores, and after the slurry solidifies, the leakage channels can be plugged to block the spread of pollution sources. The diffusion of slurry in rock mass fractures is a complex process, and there is usually groundwater in deep rock mass fractures. Studying the diffusion mechanism of slurry in water-containing fractures is of great significance for optimizing the design of grouting parameters and ensuring the grouting effect, and studying the migration law of slurry in a single fracture is the basis and theoretical support for studying the grouting project of fractured rock masses.

[0003] Due to the uncontrollability of many factors in on-site grouting tests, laboratory tests have become the main means of research. In the existing technologies:

[0004] The Chinese invention patent "A Simulation Device for Visualizable and Controllable Rough Single-Fracture Seepage and Its Use Method" (CN114518311A) provides a visualizable and controllable rough single-fracture seepage simulation device, including a admixture stirring unit, a single-fracture simulation unit, and a waste liquid recovery unit. This device realizes the simulation of the seepage conditions of rock fractures under different types and environments through an adjustable fracture inclination angle movable plate surface and transparent front and rear plates, and studies the influence of fracture aperture and roughness on seepage. The Chinese invention patent "A Visualization Test Method for Single-Fracture Grouting Seepage with Variable Width and Roughness" (CN114878434A) discloses a visualization test method for single-fracture grouting seepage with variable width and roughness, including components such as a visualizable single-fracture seepage device and a rotating bearing device, which can observe the slurry migration process by adjusting the fracture inclination angle and provide an intuitive visualization platform for studying the mechanism of grouting to plug fractures. The Chinese invention patent "A Single-Fracture High-Pressure Grouting Seepage Test Device Suitable for Laboratories" (CN112525776A) provides a laboratory single-fracture high-pressure grouting seepage test device, which uses high-strength manganese plates and a high-precision polished fracture surface to realize the simulation of the single-fracture grouting seepage process under high grouting pressure conditions. The grouting test device proposed in the Chinese invention patent "Visualizable Variable-Aperture Fracture Grouting Test Device and Method under Static and Dynamic Water Conditions" (CN109283097A) realizes the visualization of fracture grouting simulation under static and dynamic water conditions, but cannot adjust the geometric structure parameters of the fractures.

[0005] Based on the comprehensive analysis of the test devices of the above units, the following deficiencies still exist:

[0006] 1) The existing devices can only study the diffusion law of one type of slurry or the variation law of pressure and flow rate.

[0007] 2) Using a number of alloy sheets spaced left and right to simulate rough fractures, it is impossible to precisely control the fracture roughness and difficult to truly restore the rough characteristics of actual rock mass fractures.

[0008] 3) The existing test devices cannot meet the requirements of high-pressure grouting, cannot achieve precise regulation of high grouting pressure, and it is difficult to obtain the variation of pressure and flow rate during the high-pressure grouting seepage process. Summary of the Invention

[0009] To solve the technical problems proposed in the background art, the present invention provides a single-fracture high-pressure grouting test system and method that can simulate the properties of various slurries.

[0010] The present invention is implemented by the following technical solutions: A single-fracture high-pressure grouting test system that can simulate the properties of various slurries, including a high-pressure grouting module, a slurry type control module, a visual single-fracture penetration module, and a data acquisition module.

[0011] The high-pressure grouting module includes a pressure slurry storage tank for storing slurry and a pressure regulation module; the slurry outlet of the pressure slurry storage tank is connected to the liquid inlet of the visual single-fracture penetration module; the pressure regulation module is used to adjust the slurry outlet pressure of the pressure slurry storage tank.

[0012] The slurry type control module is used to prepare different types of slurries and transport them into the pressure slurry storage tank.

[0013] The visual single-fracture penetration module includes a transparent upper plate, a lower plate, a prefabricated rough fracture upper plate, a prefabricated rough fracture lower plate, and an enclosure mechanism. The prefabricated rough fracture upper plate and the prefabricated rough fracture lower plate are respectively fixedly connected to the upper plate and the lower plate. The enclosure mechanism is fixed to the upper plate and the lower plate to form a fracture channel between the prefabricated rough fracture upper plate and the prefabricated rough fracture lower plate.

[0014] Among them: The upper plate is provided with a grouting hole connected to the high-pressure grouting device, and the upper plate is also provided with an overflow hole. The lower plate is provided with a plurality of detection hole positions communicating with the fracture channel;

[0015] The data acquisition module includes a computer and pressure sensors arranged in the detection hole positions, and the computer is electrically connected to the pressure regulation module, the slurry type control device, and the pressure sensors.

[0016] Preferably, the pressure regulation module includes: an air compressor, a cylinder, a pressure slurry storage tank, a pressure gauge, and a one-way regulating valve, where:

[0017] The air outlet of the air compressor is connected to the one-way throttle valve of the cylinder through an injection pipe. A pressure gauge and a one-way throttle valve are sequentially arranged on the injection pipe along the gas flow direction. The one-way throttle valve is respectively connected to the cylinder inlet and the cylinder outlet through the injection pipe. The cylinder is connected to the pressure slurry storage tank through a piston. A sealing cover is arranged on the top of the pressure slurry storage tank, and the sealing cover is connected to the pressure slurry storage tank through bolts. A magnetic stirrer a and a slurry outlet are arranged at the bottom of the pressure slurry storage tank. The slurry outlet is connected to the grouting hole in the visual single fracture seepage module through a grouting pipe.

[0018] The computer is respectively connected to the pressure gauge and the one-way throttle valve through signals.

[0019] Preferably, the slurry type control module includes a cement filler, a water tank, solenoid valve a, solenoid valve b, solenoid valve c, solenoid valve d, a slurry storage chamber, a magnetic stirrer b, and admixture injection chambers a, b, and c, where:

[0020] The cement filler is fixedly connected to the sealing cover. The water tank, the admixture injection chambers a, b, and c, and the slurry storage chamber are connected through a grouting pipe;

[0021] Solenoid valve a, solenoid valve b, and solenoid valve c are sequentially arranged at the lower part of the water tank and the lower parts of the admixture injection chambers a, b, and c along the liquid flow direction,

[0022] The computer is respectively connected to solenoid valve a, solenoid valve b, solenoid valve c, and the cement filler through signals.

[0023] Preferably, the surrounding mechanism includes a sealing rubber, spacer block a, spacer block b, clamp a, clamp b, clamp c, and clamp d, where:

[0024] The sealing rubber is arranged outside the fracture channel,

[0025] Clamp a and clamp b are fastened to the upper and lower parts of the sealing rubber;

[0026] Clamp c and clamp d are fastened to both sides of the spliced upper plate and lower plate;

[0027] Spacer block a and spacer block b are installed between the upper plate and the lower plate to determine the width of the fracture channel.

[0028] Preferably, the prefabricated rough fracture upper plate and the prefabricated rough fracture lower plate are formed by 3D printing.

[0029] Preferably, the upper plate and the lower plate are respectively provided with clamping grooves corresponding to and fixedly connected to the prefabricated rough fracture upper plate and the prefabricated rough fracture lower plate.

[0030] Preferably, the detection hole positions on the lower plate are threaded holes, and the detection hole positions are provided on the left and right sides and the middle of the lower plate. The pressure sensors include pressure sensor a, pressure sensor b, and pressure sensor c, and the pressure sensors are helically fitted and installed with the detection hole positions.

[0031] The present invention also provides a single-fracture high-pressure grouting test method that can simulate various slurry properties, including the following steps:

[0032] Step 1: Calculate the masses of various materials required for preparing the slurry, control the cement filler, the water tank valve, and the valves of different admixture injection chambers according to the ratio, put the required materials into the slurry storage chamber, and after stirring evenly by a stirrer, open the solenoid valve and inject them into the pressure slurry storage tank.

[0033] Step 2: Assemble the visualization single-fracture penetration module according to the test requirements, paste the prefabricated rough model plate to the upper plate and the lower plate of the device, place the spacer blocks between the upper plate and the lower plate of the device, and after installing the sealing rubber, fix the device tightly with a clamp.

[0034] Step 3: Turn on the data acquisition device and zero each sensor.

[0035] Step 4: Inject air into the cylinder through an air compressor, and the cylinder pushes the piston to inject the prepared slurry in the pressure slurry storage tank into the visualization single-fracture penetration module to study the migration process of the slurry in the single fracture.

[0036] Step 5: After the test is completed, inject water into the entire test system through the high-pressure grouting device to clean the entire test system for facilitating repeated tests next time.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] The present invention can realize single-fracture grouting tests with different fracture apertures and roughnesses, can study and analyze the migration laws of slurry in fractures of various geometric sizes, and thus obtain a large amount of single-fracture grouting test data;

[0039] In the present invention, cement, water, and different admixtures are separated by different chambers to realize the preparation of different types of slurries. The slurry type control device is simple to use and more accurate, and can simulate the migration process of various types of slurries in fractures;

[0040] In the present invention, high-pressure gas is injected into the pressure slurry storage tank, and the high-pressure gas is used to inject the slurry into the fracture model, so as to be able to meet the requirements of high-pressure grouting in the grouting test and obtain the pressure-flow changes during the high-pressure grouting seepage process;

[0041] This test is easy to operate with a small workload, which can significantly save human and material resources. Through the present invention, the seepage and migration process of slurry in a single fracture with complex geometric structure can be accurately simulated, and the test results are closer to the actual engineering conditions. The visual design of the system makes the whole process of grouting and filling the fracture intuitive and visible, providing a reliable platform for in-depth study of the fracture seepage law and grouting plugging mechanism. Brief Description of the Drawings

[0042] Figure 1 It is a schematic diagram of the overall structure of the single-fracture high-pressure grouting test system with variable slurry properties of the present invention.

[0043] Figure 2 It is a front view of the disassembled visual single-fracture infiltration module of the present invention.

[0044] Figure 3 It is a side view of the disassembled visual single-fracture infiltration module of the present invention.

[0045] Figure 4 It is a front view of the assembled visual single-fracture infiltration module of the present invention.

[0046] Figure 5 It is a top view of the assembled visual single-fracture infiltration module of the present invention;

[0047] Figure 6 It is a three-dimensional exploded view of a partial structure of the visual single-fracture infiltration module of the present invention.

[0048] Main Symbol Explanation:

[0049] 1 - Air compressor, 2 - Pressure gauge a, 3 - One-way throttle valve, 4 - Cylinder air inlet, 5 - Cylinder air outlet, 6 - Fixing bolt, 7 - Piston, 8 - Magnetic stirrer a, 9 - Cement filler, 10 - Additive injection chamber a, 11 - Additive injection chamber b, 12 - Additive injection chamber c, 13 - Water tank, 14 - Solenoid valve a, 15 - Solenoid valve b, 16 - Solenoid valve c, 17 - Solenoid valve d, 18 - Slurry storage chamber, 19 - Magnetic stirrer b, 20 - Solenoid valve e, 21 - Pressure gauge b, 22 - Solenoid valve f, 23 - Visual single-fracture infiltration module, 24 - Flowmeter, 25 - Beaker, 26 - Computer;

[0050] 2301 - Upper plate, 2302 - Lower plate, 2303 - Grouting hole, 2304 - Overflow hole, 2305 - Pressure sensor a, 2306 - Pressure sensor b, 2307 - Pressure sensor c, 2308 - Prefabricated rough fracture upper plate, 2309 - Prefabricated rough fracture lower plate, 2310 - Clamp a, 2311 - Clamp b, 2312 - Clamp c, 2313 - Clamp d, 2314 - Spacer a, 2315 - Spacer b, 2316 - Sealing rubber. Detailed Description of the Invention

[0051] Next, in combination with the accompanying drawings and specific embodiments, the present invention will be further described. It should be noted that, on the premise of non - conflict, the following - described embodiments or technical features can be combined arbitrarily to form new embodiments.

[0052] Embodiment 1:

[0053] Referring to Figures 1-6 , a single - fracture high - pressure grouting test system capable of simulating various slurry properties proposed by the present invention includes a high - pressure grouting module, a slurry type control module, a visual single - fracture seepage module 23, and a data acquisition module.

[0054] The high - pressure grouting module includes a pressure slurry storage tank for storing slurry and a pressure adjustment module; the slurry outlet of the pressure slurry storage tank is connected to the liquid inlet of the visual single - fracture seepage module 23; the pressure adjustment module is used to adjust the outlet slurry pressure of the pressure slurry storage tank.

[0055] The slurry type control module is used to prepare different types of slurries and transport them into the pressure slurry storage tank.

[0056] The visual single - fracture seepage module 23 includes a transparent upper plate 2301, a lower plate 2302, a pre - fabricated rough fracture upper plate 2308, a pre - fabricated rough fracture lower plate 2309, and an enclosing mechanism. The pre - fabricated rough fracture upper plate 2308 and the pre - fabricated rough fracture lower plate 2309 are respectively fixedly connected to the upper plate 2301 and the lower plate 2302. The enclosing mechanism is fixed to the upper plate 2301 and the lower plate 2302, so as to form a fracture channel between the pre - fabricated rough fracture upper plate 2308 and the pre - fabricated rough fracture lower plate 2309.

[0057] Among them: the upper plate 2301 is provided with a grouting hole connected to the high - pressure grouting device, and the upper plate 2301 is also provided with an overflow hole 2304. The lower plate 2302 is provided with a plurality of detection hole positions communicating with the fracture channel;

[0058] The data acquisition module includes a computer and pressure sensors arranged in the detection hole positions, and the computer is electrically connected to the pressure adjustment module, the slurry type control device, and the pressure sensors.

[0059] In this solution, the pressure adjustment module includes: an air compressor 1, a cylinder, a pressure slurry storage tank, a pressure gauge 2, and a one - way regulating valve 3, where:

[0060] The air outlet of the air compressor 1 is connected to the one-way throttle valve 3 of the cylinder through an injection pipe. The pressure gauge 2 and the one-way throttle valve 3 are arranged on the injection pipe in sequence along the gas flow direction. The one-way throttle valve 3 is respectively connected to the cylinder air inlet 4 and the cylinder air outlet 5 through injection pipes. The cylinder is connected to the pressure slurry storage tank through a piston 7. A sealing cover is arranged on the top of the pressure slurry storage tank, and the sealing cover is connected to the pressure slurry storage tank through bolts 6. A magnetic stirrer a8 and a slurry outlet are arranged at the bottom of the pressure slurry storage tank. The slurry outlet is connected to the grouting hole in the visual single fracture seepage module 23 through a grouting pipe.

[0061] The computer 26 is respectively connected to the pressure gauge 2 and the one-way throttle valve 3 in a signal connection.

[0062] In this embodiment, the slurry type control module includes a cement filler 9, a water tank 13, a solenoid valve a14, a solenoid valve b15, a solenoid valve c16, a solenoid valve d17, a slurry storage chamber 18, a magnetic stirrer b19, and an admixture injection chamber a10, an admixture injection chamber b11, and an admixture injection chamber c12, where:

[0063] The cement filler 9 is fixedly connected to the sealing cover. The water tank 13, the admixture injection chamber a10, the admixture injection chamber b11, the admixture injection chamber c12, and the slurry storage chamber 18 are connected through grouting pipes;

[0064] The solenoid valve a14, the solenoid valve b15, and the solenoid valve c16 are arranged in sequence along the liquid flow direction at the lower part of the water tank 13 and the lower parts of the admixture injection chamber a10, the admixture injection chamber b11, and the admixture injection chamber c12,

[0065] The computer 26 is respectively connected to the solenoid valve a14, the solenoid valve b15, the solenoid valve c16, and the cement filler 9 in a signal connection.

[0066] It should be noted that the enclosure mechanism includes a sealing rubber 2316, a spacer a2314, a spacer b2315, a clamp a2310, a clamp b2311, a clamp c2312, and a clamp d2313, where:

[0067] The sealing rubber 2316 is arranged outside the fracture channel,

[0068] The clamp a2310 and the clamp b2311 are fastened to the upper and lower parts of the sealing rubber 2316;

[0069] The clamp c2312 and the clamp d2313 are fastened to both sides of the spliced upper plate 2301 and the lower plate 2302;

[0070] The spacer a2314 and the spacer b2315 are installed between the upper plate 2301 and the lower plate 2302 to be used for determining the width of the fracture channel.

[0071] It is worth mentioning that the prefabricated rough fracture upper plate 2308 and the prefabricated rough fracture lower plate 2309 are formed by 3D printing.

[0072] In this solution, clamping grooves corresponding to the prefabricated rough fracture upper plate 2308 and the prefabricated rough fracture lower plate 2309 are respectively formed on the upper plate 2301 and the lower plate 2302 for clamping and fixing.

[0073] The detection hole positions on the lower plate 2302 are threaded holes, and 3 detection hole positions are formed on the left and right sides and the middle of the lower plate 2302. The pressure sensors include a pressure sensor a2305, a pressure sensor b2306, and a pressure sensor c2307, and the pressure sensors are installed in a screw fit with the detection hole positions.

[0074] Embodiment 2:

[0075] The present invention also proposes a single-fracture high-pressure grouting test method capable of simulating various slurry properties, including the following steps:

[0076] Step 1: Calculate the masses of various materials required to configure the slurry, control the cement filler, the water tank valve, and the valves of different admixture injection chambers according to the ratio, put the required materials into the slurry storage chamber, and after stirring evenly by a stirrer, open the solenoid valve and inject them into the pressure slurry storage tank.

[0077] Step 2: Assemble the visual single-fracture seepage module according to the test requirements, paste the prefabricated rough model plate to the upper plate and the lower plate of the device, place the spacer block between the upper plate and the lower plate of the device, and after installing the sealing rubber, fix the device tightly with a clamp.

[0078] Step 3: Turn on the data acquisition device and zero each sensor.

[0079] Step 4: Inject air into the cylinder through an air compressor, and the cylinder pushes the piston to inject the prepared slurry in the pressure slurry storage tank into the visual single-fracture seepage module to study the migration process of the slurry in the single fracture.

[0080] Step 5: After the test is completed, inject water into the entire test system through the high-pressure grouting device to clean the entire test system for facilitating repeated tests next time.

[0081] More specifically:

[0082] Step 1: Set the slurry type of the requirement configuration. The computer 26 calculates the mass of various materials of the slurry for the requirement configuration. First, turn on the cement filler 9 through a signal to put cement into the slurry storage chamber 18. Then, turn on the solenoid valve a14, solenoid valve b15, solenoid valve c16 below the admixture injection chamber, and solenoid valve d17 below the water tank in sequence through signals to add the required water and admixture into the slurry storage chamber 18. Start the magnetic stirrer b19 to stir the slurry.

[0083] Step 2: Obtain the three-dimensional model of the real rough fracture surface by scanning with a three-dimensional surface scanner. Use a 3D printer to print the prefabricated rough fracture upper plate 2308 and the prefabricated rough fracture lower plate 2309. Select the corresponding prefabricated rough fracture model plate according to the fracture geometric structure parameters required by the test. Install the prefabricated rough fracture upper plate 2308 and the prefabricated rough fracture lower plate 2309 in the card slots of the acrylic device upper plate 2301 and the acrylic device upper plate 2302 to simulate the real fracture roughness. Install the spacer a2314 and the spacer b2315 between the acrylic upper and lower plates to determine the fracture aperture. Wrap the periphery of the fracture channel with the sealing rubber 2316. Use the clamp a2310 and the clamp b2311 to fasten the upper and lower parts of the sealing rubber 2316. Use the clamp c2312 and the clamp d2313 to fasten the left and right sides of the upper and lower acrylic plates respectively.

[0084] Step 3: Turn on the pressure sensor a2305, pressure sensor b2306, pressure sensor c2307, pressure gauge a2, pressure gauge b21, and flowmeter 24, and connect them to the computer 26 through signals. Check the values of each sensor and manually zero all the values.

[0085] Step 4: Achieve the required grouting pressure by controlling the one-way throttle valve 3 on the high-pressure grouting device. When the pressure gauge a2 above the pressure slurry storage tank reaches the set grouting pressure, open the solenoid valve f22 at the bottom of the pressure slurry storage tank. The slurry in the pressure slurry storage tank is injected into the visualization single fracture seepage module 23 under the action of high-pressure gas through the grouting pipe. The slurry seeps and migrates from left to right in the fracture channel, and then flows out through the overflow hole 2304 on the right side of the acrylic device upper plate 2301 into the beaker 25. In this process, the migration process of the slurry can be observed. If it is necessary to measure the pressure change during the slurry migration process, the pressure sensors a2305, pressure sensor b2306, and pressure sensor c2307 are installed at the screw interfaces of the acrylic device lower plate. The computer 26 is connected to each pressure sensor through signals, and each pressure sensor can record the pressure change data of the slurry during the migration process in the single fracture channel in real time. The computer 26 is connected to the flowmeter 24 at the overflow hole 2304 through signals. The computer processes the data of pressure and flow, and then the variation laws of pressure and flow of the slurry during the migration process in the single fracture channel can be analyzed.

[0086] Step 5: After the test is completed, the computer 26 controls the solenoid valve d17 below the water tank 13 in the slurry type control device, and injects the clear water in the pressure storage tank into the visualized single fracture seepage module 23 through the high-pressure grouting device to wash the residual slurry in the fracture channel until the overflowing clear water is free of impurities. Repeat the above operations to clean the entire system. Disassemble the clamp a2310, clamp b2311, clamp c2312 and clamp d2313, disassemble the prefabricated rough fracture upper plate 2308 and the prefabricated rough fracture lower plate 2309, wipe off the residual slurry on the surface, and finally close all valves.

[0087] The above embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A single-fracture high-pressure grouting test system capable of simulating various slurry properties, characterized in that: It includes a high-pressure grouting module, a slurry type control module, a visualized single fracture permeability module (23) and a data acquisition module; The high-pressure grouting module comprises a pressure slurry storage tank for storing slurry and a pressure regulating module; the slurry outlet of the pressure slurry storage tank is connected to the liquid inlet of the visualized single fracture permeability module (23); the pressure regulating module is used to adjust the slurry outlet pressure of the pressure slurry storage tank; The slurry type control module is used to prepare different types of slurries and transport them to the pressure slurry storage tank; The visualized single crack penetration module (23) comprises a transparent upper plate (2301), a lower plate (2302), a prefabricated rough crack upper plate (2308), a prefabricated rough crack lower plate (2309) and an enclosure mechanism, wherein the prefabricated rough crack upper plate (2308) and the prefabricated rough crack lower plate (2309) are fixedly connected to the upper plate (2301) and the lower plate (2302), respectively, and the enclosure mechanism is fixed to the upper plate (2301) and the lower plate (2302), thereby forming a crack channel between the prefabricated rough crack upper plate (2308) and the prefabricated rough crack lower plate (2309); The upper plate (2301) is provided with a grouting hole connected to a high-pressure grouting device, the upper plate (2301) is also provided with a grouting hole (2304), and the lower plate (2302) is provided with a plurality of detection holes connected to the crack channel; The data acquisition module includes a computer and a pressure sensor arranged in the detection hole, and the computer and the pressure regulating module, the slurry type control device and the pressure sensor are all electrically connected.

2. A single-crack high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The pressure regulating module comprises: an air compressor (1), an air cylinder, a pressure slurry storage tank, a pressure gauge (2) and a one-way regulating valve (3), wherein: The air outlet of the air compressor (1) is connected to the one-way throttle valve (3) of the cylinder through an air injection pipe, the pressure gauge (2) and the one-way throttle valve (3) are arranged on the air injection pipe in sequence along the direction of gas flow, the one-way throttle valve (3) is respectively connected to the air inlet (4) and the air outlet (5) of the cylinder through the air injection pipe, the cylinder is connected to the pressure slurry storage tank through a piston (7), a sealing cover is arranged on the top of the pressure slurry storage tank, the sealing cover and the pressure slurry storage tank are connected through bolts (6), a magnetic stirrer a (8) and a slurry outlet are arranged at the bottom of the pressure slurry storage tank, and the slurry outlet is connected to the grouting hole in the visualized single fracture permeability module (23) through a grouting pipe, The computer (26) is respectively connected to the pressure gauge (2) and the one-way throttle valve (3) via signals.

3. A single-crack high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The slurry type control module comprises a cement filler (9), a water tank (13), a solenoid valve a (14), a solenoid valve b (15), a solenoid valve c (16), a solenoid valve d (17), a slurry storage chamber (18), a magnetic stirrer b (19), and an additive injection chamber a (10), an additive injection chamber b (11), and an additive injection chamber c (12), wherein: The cement filler (9) is fixedly connected to the sealing cover, and the water tank (13) and the additive injection chamber a (10), the additive injection chamber b (11), the additive injection chamber c (12) and the slurry storage chamber (18) are connected via a grouting pipe; The electromagnetic valve a (14), the electromagnetic valve b (15) and the electromagnetic valve c (16) are sequentially arranged at the lower part of the water tank (13) and the lower part of the additive injection chamber a (10), the additive injection chamber b (11) and the additive injection chamber c (12) along the direction of liquid flow. The computer (26) is respectively connected to the solenoid valve a (14), the solenoid valve b (15), the solenoid valve c (16) and the cement filler (9) via signals.

4. A single-crack high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The enclosing mechanism comprises a sealing rubber (2316), a cushion block a (2314), a cushion block b (2315), a clamp a (2310), a clamp b (2311), a clamp c (2312) and a clamp d (2313), wherein: The sealing rubber (2316) is arranged outside the crack channel; The clamp a (2310) and the clamp b (2311) are fastened to the upper and lower parts of the sealing rubber (2316); The clamp c (2312) and the clamp d (2313) are fastened on both sides of the spliced ​​upper plate (2301) and the lower plate (2302); The pad a (2314) and the pad b (2315) are installed between the upper plate (2301) and the lower plate (2302) to determine the width of the crack channel.

5. A single-fracture high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The prefabricated rough crack upper plate (2308) and the prefabricated rough crack lower plate (2309) are printed and formed using a (3)D printer.

6. A single-fracture high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The upper plate (2301) and the lower plate (2302) are respectively provided with slots corresponding to the prefabricated rough crack upper plate (2308) and the prefabricated rough crack lower plate (2309) for fixing.

7. A single-crack high-pressure grouting test system capable of simulating various slurry properties as claimed in claim 1, characterized in that: The detection holes on the lower plate (2302) are threaded holes, and there are (3) detection holes on the left and right sides and the middle of the lower plate (2302). The pressure sensors include pressure sensor a (2305), pressure sensor b (2306) and pressure sensor c (2307), and the pressure sensors and the detection holes are installed in a spiral manner.

8. A single fracture high pressure grouting test method capable of simulating various slurry properties as claimed in claim 1, characterized in that: The steps include: Step 1: Calculate the mass of various materials required for preparing slurry, control the cement filler, water tank valve and valves of different admixture injection chambers according to the ratio, put the required materials into the slurry storage chamber, stir them evenly with the agitator, and then open the solenoid valve to inject them into the pressure slurry storage barrel. Step 2: Assemble the visualized single fracture penetration module according to the test requirements, stick the prefabricated rough model plate to the upper plate and the lower plate of the device, place the gasket between the upper plate and the lower plate of the device, install the sealing rubber and fix the device tightly with the clamp. Step 3: Turn on the data acquisition device and adjust the zero of each sensor. Step 4: Inject air into the cylinder through an air compressor. The cylinder pushes the piston to inject the slurry prepared in the pressure storage tank into the visualized single fracture permeability module to study the migration process of the slurry in the single fracture. Step 5: After the test is completed, water is injected into the entire test system through a high-pressure grouting device to clean the entire test system to facilitate repeated testing next time.

Images