Loose rock and soil layer grouting test device and method

Abstract

The present invention relates to a loose rock and soil layer grouting test device and method, the device comprises a piston stirring slurry storage container, a pressurizing piston is arranged in the shell of the piston stirring slurry storage container, the pressurizing piston separates the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity, the pressurizing drive cavity is connected to a constant speed constant pressure horizontal flow pump through a pipeline, the constant speed constant pressure horizontal flow pump is used to input liquid into the pressurizing drive cavity, an electromagnetic stirring mechanism is arranged at one end of the slurry storage cavity of the piston stirring slurry storage container, and the slurry storage cavity is connected to a grouting simulation test kettle through a pipeline. The method uses this device to perform grouting tests on simulated soil layers. The present invention has simple structure, stable operation, convenient operation, safety and reliability, high pressure resistance, and can truly simulate the grouting process and the quantitative influence of pump pressure parameters on the grouting effect.

Description

Technical Field

[0001] The invention relates to a soil layer penetration grouting effect evaluation test device, in particular to a loose rock and soil layer grouting test device and method. Background Art

[0002] At present, the number of geotechnical engineering construction projects carried out in the accumulation, alluvial or sedimentary strata of mountainous areas and river slopes, edges and terraces is increasing, and loose strata of varying thickness are often encountered. Most of these unbonded or weakly bonded strata of sand and gravel are in a loose state, with poor bonding and strong instability. Therefore, in the process of using the above-mentioned loose strata as the foundation bearing layer and the excavation of the subway foundation pit, it may cause large stratum deformation, produce adverse effects and cause accidents, resulting in casualties. Therefore, the above-mentioned loose strata are often grouting reinforced to improve their bearing capacity and enhance the safety of the project. However, the current selection of grouting technology, the setting of grouting pressure parameters and the formulation of slurry are mostly based on actual engineering experience, lacking certain theoretical scientific guidance; and the grouting technology is restricted by the complexity of the injection medium conditions and the concealment of the grouting project, so theoretical simulation research is relatively difficult. Therefore, it is more urgent to carry out research on the test method and test device for grouting reinforcement of loose strata.

[0003] At present, there are many studies on grouting materials and grouting equipment, but there are few experimental methods and experimental devices for the penetration law and diffusion range of injected slurry in the formation, the time-space infiltration characteristics, and the three-dimensional pore pressure distribution law in the formation under different grouting pressure, pressure gradient, pumping flow, grouting fluid properties (viscosity, rheology) and other parameter conditions. The grouting reinforcement effect and slurry influence radius of loose formations are not only closely related to the grouting method and slurry properties, but also to a series of factors such as pumping pressure, pressure gradient, pumping displacement, slurry viscosity, rheological properties, etc. Therefore, the grouting process is a complex process with multiple factors interrelated and affecting each other.

[0004] Some existing test equipment and methods cannot truly simulate the grouting process and the quantitative influence of pump pressure parameters on the grouting effect. Existing test equipment generally uses air compressors to compress air or uses nitrogen bottles to provide pump pressure, but the compression coefficient of the gas medium is sensitive to temperature changes, which can easily cause pressure fluctuations during the test and make it difficult to simulate the pump pressure boost gradient. Existing equipment basically has no stirring or uses mechanical stirring. Since mechanical stirring requires the drive shaft to pass through the side wall of the container, the sealing performance at this position is greatly reduced, and the high-pressure sealing of the slurry storage container cannot be achieved.

[0005] Therefore, it is necessary to develop a test device and method that can carry out real-time monitoring in the laboratory, such as the simulation of the loose stratum grouting reinforcement process, the slurry penetration law and reinforcement evaluation effect, and the slurry diffusion range monitoring, so as to provide technical support for the formulation of actual loose stratum grouting reinforcement engineering plans, the optimization of grouting process parameters, and the evaluation of grouting effects. Summary of the invention

[0006] One of the purposes of the present invention is to provide a loose rock and soil layer grouting test device to solve the problem that the existing test equipment cannot truly simulate the grouting process and the quantitative influence of pump pressure parameters on the grouting effect.

[0007] The second purpose of the present invention is to provide a loose rock and soil layer grouting test method to solve the problem that the current test method cannot simulate the loose stratum grouting reinforcement process, the slurry penetration law and reinforcement evaluation effect and the slurry diffusion range monitoring and other real-time monitoring.

[0008] One of the purposes of the present invention is achieved in that:

[0009] A loose rock and soil layer grouting test device comprises a piston stirring slurry storage container, a pressurizing piston is arranged in the shell of the piston stirring slurry storage container, the pressurizing piston divides the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity, the pressurizing drive cavity is connected with a constant speed and constant pressure horizontal flow pump through a pipeline, the constant speed and constant pressure horizontal flow pump is used to input liquid into the pressurizing drive cavity, an electromagnetic stirring mechanism is arranged at one end of the slurry storage cavity of the piston stirring slurry storage container, and the slurry storage cavity is connected with a grouting simulation test kettle through a pipeline.

[0010] The electromagnetic stirring mechanism includes a stirring blade and a stirring motor. The stirring blade is located in the slurry storage chamber. The magnetic properties of the two ends of the stirring blade are different. The stirring motor is located outside the shell of the piston stirring slurry storage container. Two magnets are arranged on the rotating shaft of the stirring motor. The end faces of the two magnets are parallel to the rotation plane of the stirring blade, and the magnetic properties of the two magnets close to one end of the stirring blade are different. The two magnets rotate around the rotating shaft of the stirring motor to drive the rotating blade to rotate.

[0011] A boss is arranged on the outer side of the shell of the piston stirring slurry storage container close to one end of the magnet, and the circumferential contour of the boss intersects with the two magnets.

[0012] The grouting simulation test kettle comprises a test kettle shell, a vertical grouting conduit is arranged on the top of the test kettle shell, a soil support pad is arranged inside the test kettle shell, a simulated formation accommodating cavity is formed above the soil support pad, the grouting conduit extends into the simulated formation accommodating cavity, and a plurality of temperature sensors and pore permeability pressure sensors are arranged on the side wall of the simulated formation accommodating cavity.

[0013] A slurry discharge channel is provided at the bottom end of the test kettle shell. A plurality of micro holes are provided on the soil support pad.

[0014] A regulating valve, a pressure sensor and a flow sensor are sequentially arranged on the pipeline connecting the piston stirring slurry storage container and the grouting simulation test kettle.

[0015] It also includes a data acquisition module, which is connected to all the pressure sensors, temperature sensors, pore pressure sensors and flow sensors.

[0016] The second object of the present invention is achieved in this way:

[0017] A loose rock and soil layer grouting test method comprises the following steps:

[0018] a. Connect and install a loose rock and soil layer grouting test device, which includes a piston stirring slurry storage container. A pressurizing piston is arranged in the shell of the piston stirring slurry storage container. The pressurizing piston divides the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity. The pressurizing drive cavity is connected to a constant speed and constant pressure horizontal flow pump through a pipeline. The constant speed and constant pressure horizontal flow pump is used to input liquid into the pressurizing drive cavity. An electromagnetic stirring mechanism is arranged at one end of the slurry storage cavity of the piston stirring slurry storage container. The slurry storage cavity is connected to a grouting simulation test kettle through a pipeline.

[0019] b. Placing a simulated stratum in the grouting simulation test kettle.

[0020] c. The liquid and solid two-phase fluids in the slurry storage chamber of the piston stirring slurry storage container are fully stirred by the electromagnetic stirring mechanism.

[0021] d. The constant speed and constant pressure horizontal flow pump injects liquid into the pressurized driving chamber, driving the pressurized piston to apply pressure to the liquid and solid two-phase fluid in the slurry storage chamber.

[0022] e. Adjust the pressure and flow rate of the fluid injected into the grouting simulation test kettle and the temperature inside the grouting simulation test kettle, and record the permeability characteristics, diffusion range and temporal and spatial pressure distribution characteristics of the injected slurry in the simulated formation.

[0023] The simulated stratum is an actual grouting stratum or a simulated stratum configured according to the geotechnical parameters of the actual grouting stratum.

[0024] A pressurizing piston is provided in the piston stirring slurry storage container of the present invention, and the pressurizing piston separates the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity. The pressurizing drive cavity is driven by a constant speed and constant pressure horizontal flow pump to inject liquid to drive the pressurizing piston to move, so that a certain pressure is generated in the slurry storage pump. Since the liquid medium is hardly compressed and the influence of temperature change is very small and can be ignored, the accuracy and controllability of the test are guaranteed. By adjusting the flow rate and pressure of the constant speed and constant pressure horizontal flow pump, the test of pump pressure boost gradient can be simulated. At the same time, the slurry in the slurry storage pump is stirred by electromagnetic stirring. Since there is no need to drill holes on the shell of the piston stirring slurry storage container to pass the rotating shaft, the sealing of the piston stirring slurry storage container can be guaranteed, thereby ensuring the high-pressure sealing of the piston stirring slurry storage container.

[0025] The present invention can timely adjust the grouting simulation test, optimize the grouting process parameters, evaluate the grouting effect, and analyze and calculate the temporal and spatial variation law of different pumping pressure-formation pore pressure-grouting amount and the three-dimensional distribution characteristics of the pore pressure of the injected formation according to the characteristics of the grouting reinforcement or repair formation and the grouting process requirements (injection pressure and pressure gradient). Through the above method and test device, the pressure and flow of the constant speed and constant pressure horizontal flow pump are adjusted to drive the piston to stir the liquid-solid two-phase fluid (cement slurry or repair agent) in the slurry storage container and inject it into the formation to be reinforced or repaired through the grouting conduit. According to different pumping pressure, boosting gradient, pumping flow, grouting fluid characteristics (viscosity, rheology) and other parameter conditions, the injected slurry is in the formation seepage characteristics and diffusion range and the temporal and spatial infiltration characteristics, the three-dimensional pore pressure distribution characteristics in the formation, and the formation permeability, the temporal and spatial distribution law and diffusion range of the permeability pressure field under different pumping pressure, displacement, boosting gradient, slurry viscosity and other process parameter conditions are simulated in the process of grouting reinforcement or repair agent injection.

[0026] The test device can carry out high and low pressure permeability tests of liquid-solid two-phase flow and liquid-solid (the migration and clogging test of solid phase particles requires the use of a liquid carrier with a certain viscosity, and the solid-carrying liquid is discharged through the drainage channel at the bottom of the kettle during the grouting test simulation). Furthermore, by coloring the slurry in the piston stirring slurry storage container, a direct test of dynamic diffusion can be carried out. The test device is equipped with a number of temperature, pressure and flow sensors, which can dynamically monitor the grouting and slurry penetration and diffusion test process, and analyze the changes in the pore pressure at each stage of the penetration grouting test and the corresponding spatial and temporal distribution of the penetration pressure field.

[0027] The test device has a simple structure, stable operation, easy operation, safety and reliability. The grouting simulation test kettle has the characteristics of visualization, quantitative scale and high pressure resistance (10MPa), which facilitates intuitive observation of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the piston stirring slurry storage container of the present invention.

[0030] Figure 3 It is a structural schematic diagram of the grouting simulation test kettle of the present invention.

[0031] Figure 4 It is a schematic diagram of three grouting conduits of the present invention.

[0032] In the figure: 1. Piston stirring slurry storage container; 2. Constant speed constant pressure horizontal flow pump; 3. Grouting simulation test kettle; 4. Pressurized drive chamber; 5. Pressurized piston; 6. Slurry storage chamber; 7. Stirring blades; 8. Stirring motor; 9. Control valve; 10. Pressure sensor; 11. Flow sensor; 12. Simulated formation; 13. Grouting conduit; 14. Temperature sensor; 15. Porosity pressure sensor; 1-1. Shell; 1-2. Liquid inlet; 1-3. Slurry outlet; 1-4. Boss; 1-5. Upper cover; 3-1. Test kettle shell; 3-2. Kettle cover; 3-3. Bottom plug; 3-4. Simulated formation containing chamber; 3-5. Soil support gasket; 3-6. Slurry discharge channel; 8-1. Mounting seat; 8-2. Magnet. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, the loose rock and soil layer grouting test device of the present invention includes a piston stirring slurry storage container 1, a pressurizing piston 5 is arranged in the shell 1-1 of the piston stirring slurry storage container 1, the pressurizing piston 5 divides the inner cavity of the piston stirring slurry storage container 1 into a pressurizing drive chamber 4 and a slurry storage chamber 6, the pressurizing drive chamber 4 is connected with a constant speed and constant pressure horizontal flow pump 2 through a pipeline, the constant speed and constant pressure horizontal flow pump 2 is used to input liquid into the pressurizing drive chamber 4, an electromagnetic stirring mechanism is arranged at one end of the slurry storage chamber 6 of the piston stirring slurry storage container 1, and the slurry storage chamber 6 is connected with a grouting simulation test kettle 3 through a pipeline.

[0034] like Figure 2As shown, the piston stirring slurry storage container 1 includes a shell 1-1, an upper cover 1-5 is installed on the top of the shell 1-1, and a slurry outlet 1-3 is opened on the side wall of the lower end of the shell 1-1. The upper cover 1-5 and the shell 1-1 are buckled together through a stepped surface and fixed together by bolts. The pressurizing piston 5 is located in the circular inner cavity of the shell 1-1, and the guide rod of the pressurizing piston 5 passes through the upper cover 1-5 and extends out of the shell 1-1. The upper cover 1-5 is provided with a liquid inlet 1-2. The liquid inlet 1-2 is connected to the constant speed and constant pressure horizontal flow pump 2 through a high-pressure pipe, and the slurry outlet 1-3 is connected to the grouting simulation test kettle 3 through a high-pressure pipe. The electromagnetic stirring mechanism includes a stirring blade 7 and a stirring motor 8, wherein the stirring blade 7 is located in the slurry storage chamber 6, and the magnetism of the two ends of the stirring blade 7 is different. The stirring motor 8 is located outside the shell 1-1 of the piston stirring slurry storage container 1, and a mounting seat 8-1 is provided at the top of the rotating shaft of the stirring motor 8, and the mounting seat 8-1 rotates with the rotating shaft. Two magnets 8-2 are fixed on the mounting seat 8-1, and the two magnets 8-2 are symmetrical about the rotating shaft. The end faces of the two magnets 8-2 are parallel to the rotating plane of the stirring blade 7, and the magnetism of the two magnets 8-2 close to one end of the stirring blade 7 is different. The two magnets 8-2 rotate around the rotating shaft of the stirring motor 8 to drive the rotating blade to rotate. The stirring blade 7 is installed at the bottom of the shell 1-1 through the rotating shaft in the center, but the rotating shaft does not pass through the shell 1-1 and only plays a supporting role. The entire shell 1-1 has good airtightness, especially in the slurry storage chamber 6, there is only one slurry outlet 1-3 for outputting the slurry, and the pressurizing piston 5 is in close contact with the inner wall of the shell 1-1, which can withstand a large pressure.

[0035] When a higher grouting pressure is required, the shell 1-1 of the piston stirring slurry storage container 1 is generally made of metal. The metal shell 1-1 can shield the magnetic field generated by the magnet 8-2, but due to the thin thickness of the shell 1-1, the shielding effect on the magnetic field is not great. When the required grouting pressure is small, a non-metallic shell 1-1 can be used, which has no shielding effect on the magnetic field.

[0036] In order to further reduce the shielding effect of the metal shell 1-1 on the magnetic field, a boss 1-4 is provided on the outer side of the shell 1-1 of the piston stirring slurry storage container 1 near the end of the magnet 8-2, and the circumferential contour of the boss 1-4 intersects with the two magnets 8-2. The circumferential surface of the boss 1-4 is perpendicular to the end surface of the boss 1-4 and the end surface of the piston stirring slurry storage container 1. After testing, this structure makes the magnetic field intensity attenuate by about 10% after passing through the shell 1-1, which can meet the needs of electromagnetic stirring and is suitable for stirring slurries of different viscosities by adjusting the speed and power of the motor.

[0037] The grouting simulation test kettle 3 includes a test kettle shell 3-1, a kettle cover 3-2 is installed on the top of the test kettle shell 3-1, a bottom plug 3-3 is installed on the bottom of the test kettle shell 3-1, a vertical grouting pipe 13 is connected in the middle of the kettle cover 3-2, the grouting pipe 13 is connected with the slurry outlet 1-3 of the piston stirring slurry storage container 1 through a high-pressure pipe, a soil support gasket 3-5 is arranged in the test kettle shell 3-1, a simulated formation accommodating chamber 3-4 is formed above the soil support gasket 3-5, the grouting pipe 13 extends into the simulated formation accommodating chamber 3-4, and a plurality of temperature sensors 14 and pore permeability pressure sensors 15 are arranged on the side wall of the simulated formation accommodating chamber 3-4, and 4 of them are evenly distributed along the same circumference of the side wall of the simulated formation accommodating chamber 3-4, and multiple circumferences are distributed along the axial direction. The side wall of the simulated stratum containing chamber 3-4 is transparent, and a scale value is provided on the side wall of the simulated stratum containing chamber 3-4, which is convenient for direct observation of the test. The soil support gasket 3-5 is used to simulate the bottom plate of the grouting stratum, and needs to have a certain rigidity and compressive strength. A number of micropores are opened on the soil support gasket 3-5, and the diameter of the micropores should be smaller than the particle size of the smallest particle of the simulated stratum 12. A slurry discharge channel 3-6 is opened on the bottom plug 3-3 to discharge the liquid seeping from the soil support gasket 3-5.

[0038] A regulating valve 9, a pressure sensor 10 and a flow sensor 11 are sequentially arranged on the pipeline connecting the piston stirring slurry storage container 1 and the grouting simulation test kettle 3. A data acquisition module is also included, which is connected to all the pressure sensors 10, the temperature sensor 14, the pore pressure sensor 15 and the flow sensor 11. The pressure and flow rate of the slurry injected into the simulated formation 12 by the grouting conduit 13 are controlled by adjusting the constant pressure constant speed horizontal flow pump and the regulating valve 9. The grouting test process is dynamically monitored in real time by collecting data from the pressure sensor 10, the flow sensor 11, the temperature sensor 14 and the pore pressure sensor 15, and the pore pressure changes at each stage of the permeation grouting test and the corresponding spatial and temporal distribution law of the permeability pressure field are analyzed.

[0039] like Figure 4 As shown, in order to better evaluate the grouting test effect, the grouting conduit 13 has three forms: Figure 4 The middle (1) is a hollow cylindrical grouting conduit 13, which is used to simulate the bottom spherical grouting. Figure 4 Middle (2) is a grouting conduit 13 with a sealed bottom and small holes evenly distributed on the side wall, which is used to simulate circumferential columnar grouting. Figure 4 The middle (3) is a grouting conduit 13 with an opening at the bottom and small holes evenly distributed on the side wall, which is used to simulate spatial spherical-columnar grouting.

[0040] The loose rock and soil layer grouting test method of the present invention comprises the following steps:

[0041] a. Connect and install a loose rock and soil layer grouting test device, which includes a piston stirring slurry storage container 1. A pressurizing piston 5 is arranged in the shell 1-1 of the piston stirring slurry storage container 1. The pressurizing piston 5 divides the inner cavity of the piston stirring slurry storage container 1 into a pressurizing drive chamber 4 and a slurry storage chamber 6. The pressurizing drive chamber 4 is connected to a constant speed and constant pressure horizontal flow pump 2 through a pipeline. The constant speed and constant pressure horizontal flow pump 2 is used to input liquid into the pressurizing drive chamber 4. An electromagnetic stirring mechanism is arranged at one end of the slurry storage chamber 6 of the piston stirring slurry storage container 1. The slurry storage chamber 6 is connected to a grouting simulation test kettle 3 through a pipeline.

[0042] b. Place a simulated stratum 12 in the grouting simulation test kettle 3.

[0043] c. The liquid and solid two-phase fluids in the slurry storage chamber 6 of the piston stirring slurry storage container 1 are fully stirred by the electromagnetic stirring mechanism.

[0044] d. The constant speed and constant pressure horizontal flow pump 2 injects liquid into the pressurized driving chamber 4, driving the pressurized piston 5 to apply pressure to the liquid and solid two-phase fluid in the slurry storage chamber 6.

[0045] e. Adjust the pressure and flow rate of the fluid injected into the grouting simulation test kettle 3 and the temperature inside the grouting simulation test kettle 3, and record the permeability characteristics, diffusion range and temporal and spatial pressure distribution characteristics of the injected slurry in the simulated formation 12.

[0046] The loose rock and soil layer grouting test method of the present invention adopts the above-mentioned loose rock and soil layer grouting test device, wherein the simulated stratum 12 is an actual grouting stratum or a simulated stratum configured according to the geotechnical parameters of the actual grouting stratum. The liquid and solid two-phase fluid is cement mortar or a repair agent. According to different pumping pressure, boost gradient, pumping flow, grouting fluid characteristics (viscosity, rheology) and other parameter conditions, the injected slurry is subjected to the formation permeability characteristics and diffusion range and temporal and spatial pressure distribution characteristics, and the influence of different pumping pressure, displacement, boost gradient, slurry viscosity and other process parameters on the formation permeability, the temporal and spatial distribution law of the permeability pressure field and the diffusion range during the grouting reinforcement or repair agent injection process of the stratum 12 is simulated, so as to provide support for the formulation of the grouting scheme and the optimization of construction parameters.

Claims

1. A grouting test device for loose rock and soil layers, It is characterized in that It comprises a piston stirring slurry storage container, a pressurizing piston is arranged in the shell of the piston stirring slurry storage container, the pressurizing piston divides the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity, the pressurizing drive cavity is connected with a constant speed constant pressure advection pump through a pipeline, the constant speed constant pressure advection pump is used to input liquid into the pressurizing drive cavity, an electromagnetic stirring mechanism is arranged at one end of the slurry storage cavity of the piston stirring slurry storage container, and the slurry storage cavity is connected with a grouting simulation test kettle through a pipeline; The electromagnetic stirring mechanism comprises a stirring blade and a stirring motor, wherein the stirring blade is located in the slurry storage chamber, and the two ends of the stirring blade have different magnetic properties. The stirring motor is located outside the shell of the piston stirring slurry storage container, and two magnets are arranged on the rotating shaft of the stirring motor, and the end faces of the two magnets are parallel to the rotating plane of the stirring blade, and the two magnets have different magnetic properties at one end close to the stirring blade, and the two magnets rotate around the rotating shaft of the stirring motor to drive the stirring blade to rotate; A soil support gasket is arranged in the shell of the test kettle, a simulated stratum accommodating cavity is formed above the soil support gasket, the grouting conduit extends into the simulated stratum accommodating cavity, a plurality of temperature sensors and pore permeability pressure sensors are arranged on the side wall of the simulated stratum accommodating cavity, and a slurry discharge channel is opened at the bottom end of the shell of the test kettle; A regulating valve, a pressure sensor and a flow sensor are sequentially arranged on the pipeline connecting the piston stirring slurry storage container and the grouting simulation test kettle.

2. The loose rock and soil layer grouting test device according to claim 1, It is characterized in that A boss is arranged on the outer side of the shell of the piston stirring slurry storage container close to one end of the magnet, and the circumferential contour of the boss intersects with the two magnets.

3. The loose rock and soil layer grouting test device according to claim 1, It is characterized in that The soil support pad is provided with a plurality of micro holes.

4. The grouting test device for loose rock and soil layer according to claim 1, It is characterized in that It also includes a data acquisition module, which is connected to all the pressure sensors, temperature sensors, pore pressure sensors and flow sensors.

5. A loose rock and soil layer grouting test method using the loose rock and soil layer grouting test device according to claim 1, It is characterized in that The following steps are involved: a. Connect and install a loose rock and soil layer grouting test device, the loose rock and soil layer grouting test device includes a piston stirring slurry storage container, a pressurizing piston is arranged in the shell of the piston stirring slurry storage container, the pressurizing piston separates the inner cavity of the piston stirring slurry storage container into a pressurizing drive cavity and a slurry storage cavity, the pressurizing drive cavity is connected to a constant speed and constant pressure advection pump through a pipeline, the constant speed and constant pressure advection pump is used to input liquid into the pressurizing drive cavity, an electromagnetic stirring mechanism is arranged at one end of the slurry storage cavity of the piston stirring slurry storage container, and the slurry storage cavity is connected to a grouting simulation test kettle through a pipeline; b. placing a simulated formation in the grouting simulation test kettle; c. The liquid and solid two-phase fluid in the slurry storage chamber of the piston stirring slurry storage container is fully stirred by the electromagnetic stirring mechanism; d. injecting liquid into the pressurized drive chamber by the constant speed and constant pressure advection pump, driving the pressurized piston to apply pressure to the liquid and solid two-phase fluid in the slurry storage chamber; e. Adjust the pressure and flow rate of the fluid injected into the grouting simulation test kettle and the temperature inside the grouting simulation test kettle, and record the permeability characteristics, diffusion range and temporal and spatial pressure distribution characteristics of the injected slurry in the simulated formation.

6. The grouting test method for loose rock and soil layer according to claim 5, It is characterized in that The simulated stratum is an actual grouting stratum or a simulated stratum configured according to the geotechnical parameters of the actual grouting stratum.

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