Test System and Method for Transparent Soil Model of Grout Consolidation and Bearing Capacity Testing of Crushed Stone Grouted Piles

Abstract

This invention belongs to the field of crushed stone grouting pile testing technology, and discloses a transparent soil model test system and method for testing the grout consolidation and bearing capacity of crushed stone grouting piles. This addresses the problems of high cost and large errors in existing technologies for studying crushed stone grouting piles. Specifically, it includes: a grouting system, a drilling system, a vertical bearing capacity testing system, a continuous physical field measurement system, a model box, and a mounting frame. The model box is filled with transparent soil. The drilling system drills holes in the transparent soil; the grouting system grouts the holes; the vertical bearing capacity testing system detects the vertical bearing capacity of the crushed stone grouting pile; and the continuous physical field measurement system acquires image information. The system of this invention allows for direct observation of the crushed stone grouting pile through transparent soil, facilitating the analysis of changes in the pile structure during vertical bearing capacity testing. The method of this invention provides real-time monitoring and recording of changes in the physical field of the crushed stone grouting pile and the surrounding soil during testing, providing intuitive image support for pile foundation performance evaluation.

Description

Technical Field

[0001] This invention relates to the field of testing technology for crushed stone grouting piles, and more particularly to a transparent soil model test system and method for testing the grout consolidation and bearing capacity of crushed stone grouting piles. Background Technology

[0002] The development of foundation treatment technology has spanned many years. Among them, pile foundation technology has become a key research technology in geotechnical engineering due to its significant effects in improving the bearing capacity of the foundation and enhancing the engineering properties of soil. Consequently, the application of pile foundation technology is becoming increasingly widespread. Among various pile foundation technologies, crushed stone piles are widely used in soft soil foundation treatment due to their simple construction, low cost, and good drainage. However, traditional crushed stone piles face limitations in bearing capacity and stability when encountering special geological conditions such as ultra-soft soil layers and highly compressible soil layers, making it difficult to meet engineering requirements. To overcome this problem, crushed stone grouting pile technology has emerged. By injecting a curing agent into the crushed stone pile, both the strength and stability of the pile itself are improved, as well as the mechanical properties of the surrounding soil. This technology allows crushed stone piles to function in more complex and varied geological environments, significantly expanding their application range. Crushed stone grouting piles not only strengthen the pile body but also indirectly reinforce the surrounding soil, thereby improving the overall performance of the entire composite foundation.

[0003] Despite significant progress in both theory and application of crushed stone grouting pile technology, a deeper understanding of its behavioral mechanisms and effects in actual geological environments remains limited. Current research methods for studying the performance of crushed stone grouting piles primarily focus on theoretical analysis, numerical simulation, or local monitoring. Theoretical analysis and numerical simulation both involve idealized analyses of the piles, resulting in significant discrepancies between the results and actual performance. Local monitoring methods are time-consuming, costly, and incapable of comprehensive study. Therefore, existing methods for studying the performance of crushed stone grouting piles suffer from significant errors, high research costs, and a lack of comprehensive, detailed, and continuous experimental observation. Particularly in simulating the interaction between the pile and soil and analyzing the impact of the grouting process on the surrounding soil, traditional methods often fail to provide sufficient visual information and accurate data support.

[0004] Therefore, the present invention provides a device that can realistically simulate the crushed stone grouting pile and its surrounding soil environment, so as to analyze its grouting process, its impact on the surrounding soil during the load-bearing process, and its own performance changes. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a transparent soil model test system and method for testing the grouting consolidation and bearing capacity of crushed stone grouting piles, thereby solving the problems of long research cycles, high costs, and large errors in research results in existing technologies for crushed stone grouting piles.

[0006] Firstly, to achieve the aforementioned objectives, the technical solution adopted by this invention is as follows:

[0007] A transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles includes: a crushed stone grouting pile grouting system, a crushed stone grouting pile drilling system, a crushed stone grouting pile vertical bearing capacity testing system, a continuous physical field measurement system, a model box, and a mounting frame. The model box is located at the bottom of the mounting frame. The model box is filled with transparent soil, and the crushed stone grouting pile drilling system drills holes in the transparent soil. The crushed stone grouting pile grouting system grouts the holes drilled by the crushed stone grouting pile drilling system to form crushed stone grouting piles. The crushed stone grouting pile vertical bearing capacity testing system detects the vertical bearing capacity of the crushed stone grouting piles. The continuous physical field measurement system is located on the side of the crushed stone grouting pile to collect image information during the grouting process and the vertical bearing capacity detection process.

[0008] In this scheme, transparent soil is filled into a model box to simulate actual geological soil. Crushed stone grouting piles are prepared in the transparent soil using a crushed stone grouting pile drilling system and a crushed stone grouting pile grouting system. The vertical bearing capacity of the crushed stone grouting piles is then tested using a crushed stone grouting pile vertical bearing capacity testing system. The changes in the pile body during the grouting and testing processes can be directly observed through the transparent soil, facilitating the analysis of the impact of the crushed stone grouting piles on the surrounding soil and the structural changes of the pile body during the vertical bearing capacity test. A continuous physical field measurement system records image information during the grouting and testing processes. By analyzing the displacement and deformation field of soil particles in the transparent soil through image information, real-time monitoring of the crushed stone grouting piles and the recording of changes in the physical field of the surrounding soil are achieved during the vertical bearing capacity test, providing intuitive and accurate image support for the performance evaluation of the crushed stone grouting piles.

[0009] Furthermore, the grouting system for crushed stone grouting piles includes an automatic lifter, which is detachably connected to the top of the mounting frame; the automatic lifter is connected to the grouting end of the grouting pipe and drives the grouting end to move up and down; the other end of the grouting pipe is connected to a grouting tank equipped with an electric mixer; the grouting tank is located on the top of the mounting frame; and an electrically controlled valve is installed on the grouting pipe.

[0010] The grouting tank is connected to an air compressor via a pneumatic pipe, and the air compressor is electrically connected to a pressure controller. A digital pressure gauge is installed on the pneumatic pipe. The pressure controller, digital pressure gauge, and automatic lift are all connected to the control system.

[0011] In this scheme, the control system controls the automatic lifting device to raise and lower, ensuring that the grouting pipe can move stably and accurately in the vertical direction during the grouting process, making the entire grouting process more uniform and avoiding grout splashing; the control system controls the air compressor to provide grouting pressure and installs an electrically controlled valve on the grouting pipe to ensure that the grouting pressure is stable for a long time, thus improving the quality of the crushed stone grouting pile.

[0012] Furthermore, the crushed stone grouting pile drilling system includes a lead screw stepper motor, which is detachably connected to the top of the mounting frame and connected to the control system; the output shaft of the lead screw stepper motor is threadedly connected to a thin-walled sleeve soil sampler, and the lead screw stepper motor drives the thin-walled sleeve soil sampler to drill holes in transparent soil.

[0013] The vertical bearing capacity testing system for crushed stone grouting piles includes a force gauge, which is threadedly connected to the output shaft of a lead screw stepper motor; a force transmission rod is connected to the bottom of the force gauge; the bottom of the force transmission rod is provided with a threaded hole, and the force transmission rod is threadedly connected to a vertical bearing capacity testing loading plate or a pre-compression consolidation loading plate through the threaded hole;

[0014] The bottom of the force transmission rod is connected to the pre-compression consolidation loading plate, which applies pressure to consolidate the transparent soil inside the model box. The structure of the pre-compression consolidation loading plate is the same as the horizontal cross-section of the model box, and several through holes are evenly distributed on the pre-compression consolidation loading plate.

[0015] The bottom of the dowel bar is connected to a vertical bearing capacity test loading plate, which is used to test the vertical bearing capacity of the crushed stone grouting pile.

[0016] In this design, a lead screw stepper motor controls a pre-loading consolidation loading plate to pressurize and consolidate the transparent soil, making its density closer to that of the actual geological soil and thus improving the accuracy and reliability of the test results. The lead screw stepper motor also controls a thin-walled sleeve soil sampler to extract soil from the transparent soil, forming a borehole for the grouting pile. This method produces a smooth inner wall for the borehole, resulting in a regular shape for the cast-in-place grouting pile, and ensuring uniform stress distribution throughout the pile during vertical bearing capacity testing. Finally, the lead screw stepper motor controls the downward movement of the vertical bearing capacity testing loading plate to provide the load for testing the vertical bearing capacity of the grouting pile. This design utilizes lead screw stepper motors to drive the pre-loading consolidation loading plate, the thin-walled sleeve soil sampler, and the vertical bearing capacity testing loading plate, enabling the system to be used not only for bearing capacity testing but also for pre-loading and consolidating transparent soil and drilling for soil extraction. It offers multiple functions, strong practicality, and a wide range of applications.

[0017] Furthermore, the continuous physical field measurement system includes a mirror-reflecting base and an industrial camera. The mirror-reflecting base is located at the bottom of the model box. A reflector is installed on the mirror-reflecting base, which reflects the laser beam emitted by the laser instrument. The laser beam enters the model box vertically from the bottom of the model box. The industrial camera is mounted on the bottom of the mounting frame via a camera mounting bracket, and the center of the camera lens of the industrial camera is on the same horizontal line as the geometric center of the crushed stone grouting pile. The model box is made of transparent plexiglass.

[0018] In this scheme, a reflector is designed to allow the laser beam emitted by the laser instrument to enter the transparent soil and form a speckle field. Continuous images of the grouting and testing processes are recorded by an industrial camera. The physical field changes of the pile body and the surrounding soil are monitored and recorded in real time. The displacement changes of the transparent soil particles can be analyzed through continuous images.

[0019] Furthermore, the mounting frame includes an upper base plate and a lower base plate, which are connected by a connecting rod; the upper base plate has mounting holes, through which the automatic lifter or the lead screw stepper motor is connected to the upper base plate.

[0020] Secondly, based on the transparent soil model test system for testing the grout consolidation and bearing capacity of crushed stone grouting piles provided in the first aspect, the present invention provides a method for testing the transparent soil model for testing the grout consolidation and bearing capacity of crushed stone grouting piles, comprising the following steps:

[0021] S1: Preparation of transparent soil;

[0022] S2: Drill holes for grouting piles in transparent soil and fill the holes with crushed stone;

[0023] S3: Grout the pile holes of the crushed stone grouting pile to form a crushed stone grouting pile; and record the grouting process;

[0024] S4: Conduct vertical bearing capacity tests on the crushed stone grouting piles and record the test process.

[0025] In this scheme, transparent soil is used to simulate actual soil, which facilitates the observation of the grouting and testing processes. Grouting is carried out in the transparent soil to form crushed stone grouting piles and the vertical bearing capacity of the crushed stone grouting piles is tested. The grouting and testing processes are recorded to facilitate the analysis of the physical field of soil particle displacement in the transparent soil.

[0026] Furthermore, S1 includes:

[0027] S101: Preparation of porous liquid; No. 15 white oil and n-dodecane were added and mixed in a square transparent box to obtain a porous liquid;

[0028] S102: Test the refractive index of the porous liquid; the refractive index of the porous liquid is tested by Abbe refractometer. If the refractive index of the porous liquid is the same as that of fumed silica, it means that the refractive index of the porous liquid is qualified.

[0029] S103: Preparation of transparent soil; transparent soil is obtained by adding fumed silica to pore liquid, with a mass ratio of pore liquid to fumed silica of 12:1 to 14:1; hollow glass bead powder of 0.1% to 0.3% by volume is added to the transparent soil as tracer particles.

[0030] S104: Vacuum degassing; The transparent soil is filled into a model box, and the model box is placed in a vacuum chamber for more than 6 hours to remove the air inside the transparent soil;

[0031] S105: Pressure consolidation; a layer of filter paper is laid on the surface of the transparent soil inside the model box, and the model box is placed inside the mounting frame; a pre-pressure consolidation loading plate is installed at the bottom of the force transmission rod; the control system is set with progressive loading pressure and preset consolidation pressure; the lead screw stepper motor drives the pre-pressure consolidation loading plate to press down progressively to compact and consolidate the transparent soil until the consolidation pressure reaches the preset consolidation pressure, and then the pressure is stopped.

[0032] In this scheme, a pore liquid is first prepared, and its refractive index is tested using an Abbe refractometer to ensure that its refractive index is the same as that of fumed silica, thus ensuring the best transparency of the resulting transparent soil. Hollow glass beads are added as tracer particles to track the displacement of soil particles and the changes in the distribution of soil particles during bearing capacity testing.

[0033] Furthermore, S2 includes:

[0034] S201: Drilling the pile hole for crushed stone grouting pile; Install a thin-walled sleeve soil sampler below the lead screw stepper motor, and make the center of the thin-walled sleeve soil sampler directly above the geometric center of the model box; Drive the lead screw stepper motor to insert the thin-walled sleeve soil sampler downward into the transparent soil, and then lift it upward to complete the soil sampling, which forms the pile hole for crushed stone grouting pile.

[0035] S202: Install grouting pipe for grouting: Install an automatic lifter on the top of the mounting frame and place the grouting pipe on the automatic lifter; the automatic lifter drives the grouting end of the grouting pipe to extend into the pile hole of the crushed stone grouting pile;

[0036] S203: Fill the pile hole of the crushed stone grouting pile with crushed stone;

[0037] S204: Pre-grouting preparation;

[0038] Adjust the reflector and laser instrument so that the laser beam emitted by the laser instrument is reflected by the reflector and enters the model box vertically from the bottom of the model box, covering all the transparent soil around the crushed stone grouting pile;

[0039] Debug the industrial camera by fixing it to the camera mounting bracket with bolts and aligning the camera center with the geometric center of the model box; debug the laser exposure parameters of the industrial camera and set the shooting rate and storage path.

[0040] Set the grouting pressure and the lifting speed of the grouting pipe; set the grouting pressure of the air compressor and the lifting speed of the automatic lifter through the control system. The lifting speed of the automatic lifter is the same as the lifting speed of the grouting pipe.

[0041] In this scheme, an automatic lifting device is used to extend the grouting pipe into the bottom of the crushed stone grouting pile hole, then crushed stone is put in, and finally the grouting pipe is lifted upward while grouting, so as to ensure that the grout can be evenly distributed to all gaps and corners of the crushed stone, and to ensure that the crushed stone grouting pile is dense and has a uniform texture.

[0042] Furthermore, S3 includes:

[0043] S301: Prepare slurry; Mix epoxy resin component A and component B to obtain slurry, pour the slurry into the injection tank, and start the electric stirrer to stir the slurry;

[0044] S302: Grouting is performed; the air compressor is turned on, and the control system controls the air compressor to provide pressure according to the grouting pressure; the digital pressure gauge detects the air pressure pipe pressure and sends it to the control system; the control system determines that the air pressure pipe pressure has reached the grouting pressure and controls the electric valve to open to start grouting.

[0045] The control system controls the automatic lifter to lift upwards based on the lifting speed of the grouting pipe;

[0046] S303: Recording; During grouting, the control system controls the industrial camera to capture image information; After the grout overflows from the surface of the crushed stone grouting pile hole, the air compressor and industrial camera are turned off to stop grouting and recording.

[0047] In this scheme, the control system controls the air compressor to perform grouting based on the grouting pressure, and the grouting process is continuous and stable. An industrial camera is used to continuously capture images of transparent soil particles during the grouting process. Based on this image information, the changes in the soil around the crushed stone grouting pile can be analyzed. This realizes the visualization of the grouting process and provides strong support for the grouting research of crushed stone grouting piles.

[0048] Furthermore, S4 includes:

[0049] S401: Crushed stone grouting pile body solidification; allow the crushed stone grouting pile body to stand for curing for more than 24 hours until all the grouting liquid in the pile body is completely solidified; the crushed stone grouting pile is completed.

[0050] S402: Prepare for vertical bearing capacity testing; install the vertical bearing capacity test loading plate at the bottom of the dowel bar, and ensure that the geometric center of the vertical bearing capacity test loading plate is directly above the geometric center of the crushed stone grouting pile; turn on the laser instrument and industrial camera;

[0051] S403: Start testing; The lead screw stepper motor drives the vertical bearing capacity test loading plate to move downwards, applying the load pressure for vertical bearing capacity testing to the crushed stone grouting pile;

[0052] During the testing process, the control system uses a lead screw stepper motor to control the vertical bearing capacity test loading plate to apply load pressure to the crushed stone grouting pile step by step; the force gauge collects the load pressure and sends it to the control system; after the control system determines that the load pressure of each level has reached stability, it controls the vertical bearing capacity test loading plate to apply the next level of load pressure;

[0053] During the inspection, the control system controls the industrial camera to take pictures;

[0054] S404: Inspection complete; once the settlement of the crushed stone grouting pile body changes abruptly or the cumulative settlement exceeds one-tenth of the pile diameter, the crushed stone grouting pile body is considered to be damaged; stop filming.

[0055] In this scheme, after the crushed stone grouting pile has solidified, its vertical bearing capacity is tested. During the test, the control system uses a screw stepper motor to control the vertical bearing capacity test loading plate to apply load pressure to the crushed stone grouting pile in stages, making the test of the vertical bearing capacity of the crushed stone grouting pile more accurate and controllable. The screw stepper motor provides load pressure in stages and feeds back the load pressure value to the control system in real time through the force gauge. This ensures that the pile body is stable after each level of load pressure is applied before the next level of load pressure is applied, thus ensuring the accuracy and reliability of the vertical bearing capacity test.

[0056] The beneficial effects of this invention are:

[0057] The transparent soil model test system for testing the grouting and bearing capacity of crushed stone grouting piles provided by this invention includes a crushed stone grouting pile drilling system and a crushed stone grouting pile grouting system, enabling the construction of crushed stone grouting piles in transparent soil. It also includes a crushed stone grouting pile vertical bearing capacity testing system, capable of detecting the vertical bearing capacity of the crushed stone grouting piles. Both the testing and grouting processes are conducted in transparent soil, achieving visualization of crushed stone grouting pile research and allowing direct observation of the pile's behavior changes in the geological environment. Furthermore, a continuous physical field measurement system records image information during the grouting and testing processes, providing reliable visual information and accurate data support for the study of crushed stone grouting piles. This transparent soil model test system provides a novel method for studying crushed stone grouting piles, breaking the limitations of traditional methods that rely solely on theoretical analysis. It fills the gap in existing crushed stone grouting pile model tests and provides new research avenues and tools for the optimization and innovation of pile foundation reinforcement technology.

[0058] The transparent soil model test method for testing the grouting consolidation and bearing capacity of crushed stone grouting piles provided by this invention records image information of the grouting and testing processes using an industrial camera. This image information can be used to analyze the influence of factors such as grouting pressure, grouting volume, and initial viscosity of the grout on the bearing capacity and stability of the crushed stone grouting pile, thereby providing a more scientific and reasonable design basis and construction guidance for pile foundation treatment. In this method, the control system intelligently controls equipment such as automatic lifting devices, air compressors, and lead screw stepper motors to realize automated grouting and testing of crushed stone grouting piles, while also making the testing process more accurate and controllable. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0060] Figure 2 This is a schematic diagram of the drilling system for the grouting pile of the present invention, which is a transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles.

[0061] Figure 3 This is a schematic diagram of the automatic lifting device structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0062] Figure 4 This is a schematic diagram of the thin-walled sleeve soil sampler structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0063] Figure 5 This is a schematic diagram of the grouting tank structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0064] Figure 6 This is a schematic diagram of the force gauge structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0065] Figure 7 This is a schematic diagram of the force transmission rod structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0066] Figure 8 This is a schematic diagram of the vertical bearing capacity testing loading plate structure of the transparent soil model test system for testing the grouting and bearing capacity of crushed stone grouting piles according to the present invention;

[0067] Figure 9 This is a schematic diagram of the preloaded consolidation loading plate structure of the transparent soil model test system for testing the grouting and bearing capacity of crushed stone grouting piles according to the present invention;

[0068] Figure 10 This is a schematic diagram of the mirror reflection base structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0069] Figure 11 This is a schematic diagram of the camera fixing support structure of the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to the present invention;

[0070] Figure 12 This is a schematic diagram of the installation frame and model box structure of the transparent soil model test system for testing the grouting and bearing capacity of crushed stone grouting piles according to the present invention.

[0071] Figure label:

[0072] 1. Grouting system for crushed stone grouting piles; 11. Automatic lifting device; 12. Electrically controlled valve; 13. Grouting tank; 14. Digital pressure gauge; 15. Control system; 16. Pressure controller; 17. Air compressor; 19. Grouting pipe; 2. Vertical bearing capacity testing system for crushed stone grouting piles; 22. Force gauge; 23. Dowel bar; 24. Vertical bearing capacity testing loading plate; 27. Pre-loading consolidation loading plate; 3. Continuous physical field measurement system; 31. Laser instrument; 32. Industrial camera; 33. Camera mounting bracket; 38. Mirror reflection base; 381. Reflector; 4. Model box; 5. Mounting frame; 61. Screw stepper motor; 62. Thin-walled sleeve soil sampler. Detailed Implementation

[0073] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various modifications are obvious as long as they fall within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0074] Example 1

[0075] like Figure 1-12 As shown, this embodiment provides a transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles. This system is used to grout crushed stone grouting piles in transparent soil to form them, and to test the vertical bearing capacity of these piles. Both the grouting process and the vertical bearing capacity testing process can be visualized through transparent soil, providing intuitive and accurate image information for the study of crushed stone grouting piles. Specifically, it includes:

[0076] Grouting system for crushed stone grouting piles 1, drilling system for crushed stone grouting piles, vertical bearing capacity testing system for crushed stone grouting piles 2, continuous physical field measurement system 3, model box 4 and mounting frame 5;

[0077] The model box 4 is placed at the bottom of the mounting frame 5; the model box 4 is filled with transparent soil, and the crushed stone grouting pile drilling system drills holes in the transparent soil; the crushed stone grouting pile grouting system 1 grouts the holes drilled by the crushed stone grouting pile drilling system to form crushed stone grouting piles; the crushed stone grouting pile vertical bearing capacity testing system 2 tests the vertical bearing capacity of the crushed stone grouting piles; and the continuous physical field measurement system 3 is set on the side of the crushed stone grouting pile to collect image information during the grouting process and the vertical bearing capacity testing process.

[0078] The grouting system 1 for crushed stone grouting piles is used to inject grout into the pile holes to form crushed stone grouting piles; it includes an automatic lifter 11, a grouting pipe 19, a grouting tank 13, and an air compressor 17;

[0079] like Figure 1 As shown, the automatic lifter 11 is detachably connected to the top of the mounting frame 5; the automatic lifter 11 is connected to the grouting end of the grouting pipe 19 and drives the grouting end to move up and down; the other end of the grouting pipe 19 is connected to the grouting tank 13 with an electric mixer; the grouting tank 13 is located on the top of the mounting frame 5; an electrically controlled valve 12 is provided on the grouting pipe 19; the grouting tank 13 is connected to the air compressor 17 through a pneumatic pipe, and the air compressor 17 is electrically connected to the pressure controller 16; a digital pressure gauge 14 is provided on the pneumatic pipe; the pressure controller 16, the digital pressure gauge 14, and the automatic lifter 11 are all connected to the control system 15; the control system 15 controls the lifting and lowering of the automatic lifter 11 to ensure that the grouting pipe 19 can move stably and accurately in the vertical direction during the grouting process, making the entire grouting process more uniform and avoiding grout splashing; the control system 15 controls the air compressor 17 to provide grouting pressure and provides an electrically controlled valve 12 on the grouting pipe 19 to ensure that the grouting pressure is stable and long-lasting, thus improving the quality of the crushed stone grouting pile.

[0080] The gravel grouting pile drilling system is used to drill gravel grouting pile holes in transparent soil; it includes a lead screw stepper motor 61 and a thin-walled sleeve soil sampler 62.

[0081] The automatic lifting device 11 and the grouting pipe 19 have the following structures: Figure 3 As shown; in a preferred embodiment, the automatic lifter includes a fixed guide rail and a sliding rail, the sliding rail being slidably connected to the fixed guide rail, and the grouting pipe 19 being disposed on the sliding rail; the fixed guide rail is provided with an electric push rod ( Figure 3 (Not shown in the text) The output shaft of the electric push rod is fixedly connected to the sliding rail; the electric push rod drives the sliding rail to move up and down, and the grouting pipe 19 set on the sliding rail moves up and down with it.

[0082] like Figure 2 and Figure 4As shown, the lead screw stepper motor 61 is detachably connected to the top of the mounting bracket 5, and the lead screw stepper motor 61 is connected to the control system 15; the output shaft of the lead screw stepper motor 61 is threadedly connected to the thin-walled sleeve soil sampler 62, and the lead screw stepper motor 61 drives the thin-walled sleeve soil sampler 62 to drill holes in the transparent soil.

[0083] The vertical bearing capacity testing system 2 for crushed stone grouting piles is used to test the vertical bearing capacity of crushed stone grouting piles; it includes a force gauge 22, a force transmission rod 23, and a vertical bearing capacity testing loading plate 24;

[0084] like Figure 5-9 As shown; the force gauge 22 is threadedly connected to the output shaft of the lead screw stepper motor 61; a force transmission rod 23 is connected to the bottom of the force gauge 22; the bottom of the force transmission rod 23 is provided with a threaded hole, and the force transmission rod 23 is threadedly connected to a vertical bearing capacity test loading plate 24 or a pre-compression consolidation loading plate 27 through the threaded hole; the bottom of the force transmission rod 23 is connected to the pre-compression consolidation loading plate 27, which applies pressure to consolidate the transparent soil in the model box 4; the structure of the pre-compression consolidation loading plate 27 is the same as the horizontal cross-section of the model box 4, and several through holes are evenly distributed on the pre-compression consolidation loading plate 27; the bottom of the force transmission rod 23 is connected to the vertical bearing capacity test loading plate 24, and the vertical bearing capacity test loading plate 24... 4. Testing the vertical bearing capacity of the crushed stone grouting pile; the lead screw stepper motor 61 controls the pre-compression consolidation loading plate 27 to pressurize the transparent soil, making it consolidated, so that the density of the transparent soil is closer to that of the actual geological soil, and the test results are more accurate and reliable; the lead screw stepper motor 61 controls the thin-walled sleeve soil sampler 62 to take soil from the transparent soil, and the soil sample forms the pile hole of the crushed stone grouting pile. The inner wall of the pile hole drilled in this way is flat, and the shape of the crushed stone grouting pile is regular, and the force is uniform in all directions during the vertical bearing capacity test; the lead screw stepper motor 61 controls the vertical bearing capacity test loading plate 24 to move downward to provide the load for testing the vertical bearing capacity of the crushed stone grouting pile. The pre-consolidation loading plate 27, the thin-walled sleeve soil sampler 62, and the vertical bearing capacity test loading plate 24 are all driven by a screw stepper motor 61, which makes the system not only suitable for bearing capacity testing, but also applicable to pre-consolidated transparent soil and soil sampling drilling. It has multiple functions, strong practicality, and wide applicability.

[0085] As a preferred embodiment, the thin-walled sleeve soil sampler 62 can be selected according to the required pile hole specifications.

[0086] The continuous physical field measurement system 3 is used to record image information during the grouting process and the vertical bearing capacity detection process; it includes a mirror reflector base 38, a laser instrument 31, and an industrial camera 32;

[0087] like Figure 10-11As shown, a mirror-reflecting base 38 is located at the bottom of the model box 4; a reflector 381 is provided on the mirror-reflecting base 38, which reflects the laser beam emitted by the laser instrument 31, so that the laser beam enters the model box 4 vertically from the bottom of the model box 4; an industrial camera 32 is located at the bottom of the mounting frame 5 through a camera fixing bracket 33, and the center of the camera lens of the industrial camera 32 is on the same horizontal line as the geometric center of the crushed stone grouting pile; the model box 4 is made of transparent plexiglass; the reflector 381 is designed to allow the laser beam emitted by the laser instrument 31 to enter the transparent soil to form a speckle field, and the industrial camera 32 records continuous images during the grouting process and the detection process; it can monitor and record the physical field changes of the pile body and the surrounding soil in real time, and the displacement and deformation of the transparent soil particles can be analyzed through continuous images.

[0088] like Figure 12 As shown, the mounting frame 5 includes an upper base plate and a lower base plate, which are connected by a connecting rod; the upper base plate has mounting holes, through which the automatic lifter 11 or the lead screw stepper motor 61 is connected to the upper base plate.

[0089] As a preferred embodiment, the lead screw stepper motor 61 can be a QS57HS45-TEX-TXX model two-phase 57 trapezoidal lead screw stepper motor.

[0090] The working principle of this embodiment:

[0091] In this embodiment, the transparent soil model test system for testing the grouting solidification and bearing capacity of crushed stone grouting piles is used to perform grouting. First, transparent soil is filled into the model box 4. Then, the thin-walled sleeve soil sampler 62 is installed at the bottom of the lead screw stepper motor 61. The lead screw stepper motor 61 drives it to drill a crushed stone grouting pile hole in the transparent soil. After drilling, the air compressor 17 is started. The air compressor 17 pressurizes the grout in the grouting tank 13 into the crushed stone grouting pile hole. During the grouting process, the industrial camera 32 captures the changes in the soil around the crushed stone grouting pile. After the grouting is completed, the grout is allowed to solidify to form a crushed stone grouting pile.

[0092] When conducting vertical bearing capacity tests on crushed stone grouting piles, the vertical bearing capacity test loading plate 24 is mounted on the lead screw stepper motor 61. The lead screw stepper motor 61 drives the vertical bearing capacity test loading plate 24 to move downward to apply load pressure to the crushed stone grouting pile. The industrial camera 32 monitors the crushed stone grouting pile in real time and records the changes in the physical field of the surrounding soil.

[0093] Example 2

[0094] like Figure 1-12 As shown, this embodiment, based on the transparent soil model test system for testing the grout consolidation and bearing capacity of crushed stone grouting piles provided in Embodiment 1, provides a method for testing the grout consolidation and bearing capacity of crushed stone grouting piles using a transparent soil model, including the following steps:

[0095] S1: Preparation of transparent soil; specifically including:

[0096] S101: Preparation of pore liquid; No. 15 white oil and n-dodecane were added and mixed in a square transparent box at a volume ratio of 10:4 to obtain pore liquid;

[0097] S102: Test the refractive index of the porous liquid; the refractive index of the porous liquid is tested by Abbe refractometer. If the refractive index of the porous liquid is the same as that of fumed silica, it means that the refractive index of the porous liquid is qualified.

[0098] As a preferred embodiment, the transparent soil has the highest transparency when the refractive index of the pore fluid is 1.4495 as determined by an Abbe refractometer.

[0099] S103: Preparation of transparent soil; transparent soil is obtained by adding fumed silica to pore liquid, with a mass ratio of pore liquid to fumed silica of 12:1 to 14:1; hollow glass bead powder of 0.1% to 0.3% by volume is added to the transparent soil as tracer particles.

[0100] Preferably, the mass ratio of pore liquid to fumed silica is 14:1;

[0101] S104: Vacuum degassing; The transparent soil is put into the model box 4, and the model box 4 is placed in the vacuum chamber for more than 6 hours to remove the air inside the transparent soil;

[0102] As a preferred embodiment, the model box 4 can be made by bonding high-strength transparent organic glass sheets with adhesive. The upper opening, four edges and bottom sealing of the model box 4 are all treated and sealed with organic material welding rods to ensure its pressure resistance and sealing performance. The preferred dimensions of the model box 4 are 200mm long × 200mm wide × 700mm high.

[0103] S105: Pressure consolidation; A layer of filter paper is laid on the surface of the transparent soil inside the model box 4, and the model box 4 is placed inside the mounting frame 5; a pre-pressure consolidation loading plate 27 is installed at the bottom of the force transmission rod 23; the control system 15 sets the step-by-step loading pressure and the preset consolidation pressure. In this embodiment, the preset consolidation pressure is 60 kPa, and the step-by-step loading pressure is 1 N; the lead screw stepper motor 61 drives the pre-pressure consolidation loading plate 27 to press down step by step to compact and consolidate the transparent soil until the consolidation pressure reaches the preset consolidation pressure, and then the pressure is stopped;

[0104] As a preferred embodiment, the transmittance of the transparent soil can be tested before and after compaction and consolidation using a light transmittance test method. Specifically, the light transmittance test method involves creating test cards with the words "Transparent soil" printed in Times New Roman style, with font sizes ranging from 5 to 36pt. The test cards are then observed horizontally through a model box 4 filled with transparent soil, and the smallest readable font size is recorded. In this embodiment, before compaction and consolidation, the smallest readable font size obtained when viewed through a 200mm long transparent box is 5pt. After compaction and consolidation, a second light transmittance test is performed, and the smallest readable font size obtained is 12pt, which still meets the transparency requirements of the grouting test.

[0105] In this embodiment, a porous liquid is first prepared, and its refractive index is tested using an Abbe refractometer to ensure that its refractive index is the same as that of fumed silica, thus ensuring the best transparency of the resulting transparent soil. Hollow glass beads are added as tracer particles to track the displacement of soil particles and the changes in soil particle distribution during bearing capacity testing. The transparency of the transparent soil is quantified using a light transmittance detection method, and tests are conducted before and after compaction to comprehensively judge the transparency of the transparent soil and the changes in transparency during compaction.

[0106] S2: Drilling pile holes for gravel grouting piles in transparent soil and filling the pile holes with gravel; specifically including:

[0107] S201: Drill the pile hole for the crushed stone grouting pile; install the thin-walled sleeve soil sampler 62 below the lead screw stepper motor 61, and make the center of the thin-walled sleeve soil sampler 62 directly above the geometric center of the model box 4; drive the lead screw stepper motor 61 to insert the thin-walled sleeve soil sampler 62 downward into the transparent soil, and then lift it upward to complete the soil sampling, which forms the pile hole for the crushed stone grouting pile after soil sampling.

[0108] As a preferred embodiment, the diameter of the pile hole for the crushed stone grouting pile is 30mm and the pile length is 300mm; the inner diameter of the thin-walled sleeve soil sampler 62 is 30mm and the wall thickness is 1mm.

[0109] S202: Grouting pipe 19 is installed for grouting: An automatic lifter 11 is installed on the top of the mounting frame 5, and the grouting pipe 19 is placed on the automatic lifter 11; the automatic lifter 11 drives the grouting end of the grouting pipe 19 to extend into the pile hole of the crushed stone grouting pile; in this embodiment, a transparent plastic pipe with a diameter of 40mm is used as the grouting pipe 19.

[0110] S203: Fill the pile hole of the crushed stone grouting pile with crushed stone; in this embodiment, fused silica sand is used to simulate crushed stone. When filling, the fused silica sand is poured into the pile hole of the crushed stone grouting pile in 10 batches to reduce the disturbance to the clay at the bottom of the pile hole and ensure that the filling is dense.

[0111] S204: Pre-grouting preparation;

[0112] Adjust the reflector 381 and the laser instrument 31 so that the laser beam emitted by the laser instrument 31 is reflected by the reflector 381 and enters the model box 4 vertically from the bottom of the model box 4, covering all the transparent soil around the crushed stone grouting pile, so as to ensure that the speckle field formed after the laser beam irradiates the transparent soil is clear and complete.

[0113] Debug the industrial camera 32, fix the industrial camera 32 to the camera mounting bracket 33 with bolts, and make the camera center of the industrial camera 32 flush with the geometric center of the model box 4 to ensure that the industrial camera 32 captures the speckle field completely; debug the laser exposure parameters of the industrial camera 32, and set the shooting rate and storage path.

[0114] Set the grouting pressure and the lifting speed of the grouting pipe 19; set the grouting pressure of the air compressor 17 and the lifting speed of the automatic lifter 11 through the control system 15. The lifting speed of the automatic lifter 11 is the lifting speed of the grouting pipe 19; in this embodiment, the grouting pressure is a constant pressure of 160 kPa and the lifting speed of the grouting pipe 19 is 40 mm / min.

[0115] In this embodiment, the grouting pipe 19 is inserted into the bottom of the pile hole of the crushed stone grouting pile by the automatic lifting device 11, and then crushed stone is put in. Finally, the grouting pipe 19 is lifted upward while grouting, so as to ensure that the grout can be evenly distributed to all gaps and corners of the crushed stone, and to ensure that the crushed stone grouting pile is dense and has a uniform texture.

[0116] S3: Grouting is performed on the pile holes of the crushed stone grouting pile to form a crushed stone grouting pile; and the grouting process is recorded; specifically including:

[0117] S301: Prepare slurry; Mix epoxy resin component A and component B at a mass ratio of 2:1 to obtain slurry, pour the slurry into grouting tank 13, and start the electric stirrer to stir the slurry;

[0118] S302: Grouting is performed; the air compressor 17 is turned on and the control system 15 controls the air compressor 17 to provide pressure according to the grouting pressure; the digital pressure gauge 14 detects the air pressure pipe pressure and sends it to the control system 15; the control system 15 determines that the air pressure pipe pressure has reached the grouting pressure and controls the electric valve 12 to open to start grouting.

[0119] The control system 15 controls the automatic lifter 11 to lift upwards according to the lifting speed of the grouting pipe 19;

[0120] S303: Recording; During grouting, the control system 15 controls the industrial camera 32 to capture image information; After the grout overflows from the surface of the crushed stone grouting pile hole, the air compressor 17 and the industrial camera 32 are turned off to stop grouting and recording.

[0121] In this embodiment, the control system 15 controls the air compressor 17 to perform grouting according to the grouting pressure, and the grouting process is continuous and stable; the industrial camera 32 continuously captures image information of transparent soil particles during the grouting process, and the changes of the soil around the crushed stone grouting pile can be analyzed based on the image information; the grouting process is visualized, which provides strong support for the grouting research of crushed stone grouting piles.

[0122] S4: Conduct vertical bearing capacity tests on the crushed stone grouting piles and record the testing process; specifically including:

[0123] S401: Crushed stone grouting pile body solidification; allow the crushed stone grouting pile body to stand for curing for more than 24 hours until all the grouting liquid in the pile body is completely solidified; the crushed stone grouting pile is completed.

[0124] S402: Prepare for vertical bearing capacity testing; install the vertical bearing capacity test loading plate 24 at the bottom of the dowel bar 23, and ensure that the geometric center of the vertical bearing capacity test loading plate 24 is directly above the geometric center of the crushed stone grouting pile; turn on the laser instrument 31 and the industrial camera 32;

[0125] S403: Start testing; the lead screw stepper motor 61 drives the vertical bearing capacity test loading plate 24 to move downwards to apply the load pressure for vertical bearing capacity testing to the crushed stone grouting pile;

[0126] During the test, the control system 15 controls the vertical bearing capacity test loading plate 24 to apply load pressure to the crushed stone grouting pile step by step through the lead screw stepper motor 61; the force gauge 22 collects the load pressure and sends it to the control system 15; after the control system 15 determines that the load pressure of each level has reached stability, it controls the vertical bearing capacity test loading plate 24 to apply the next level of load pressure.

[0127] During the inspection, the control system 15 controls the industrial camera 32 to take pictures;

[0128] S404: Inspection complete; once the settlement of the crushed stone grouting pile body changes abruptly or the cumulative settlement exceeds one-tenth of the pile diameter, the crushed stone grouting pile body is considered damaged; stop filming;

[0129] As a preferred embodiment, the image information captured by the industrial camera 32 can be analyzed and calculated using the image data analysis software PIVview2c. The PIVview2c software can analyze the displacement deformation field of transparent soil particles in continuous photographs.

[0130] In this embodiment, after the crushed stone grouting pile has solidified, its vertical bearing capacity is tested. During the test, the control system 15 controls the vertical bearing capacity test loading plate 24 to apply load pressure to the crushed stone grouting pile step by step through the screw stepper motor 61, making the test of the vertical bearing capacity of the crushed stone grouting pile more accurate and controllable. The screw stepper motor 61 provides load pressure in stages and feeds back the load pressure value to the control system 15 in real time through the force gauge 22, ensuring that the pile body is stable after each level of load pressure is applied before applying the next level of load pressure, thus ensuring the accuracy and reliability of the vertical bearing capacity test.

[0131] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention and should be understood as not limiting the scope of protection of the invention to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed herein without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of the invention.

Claims

1. A transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles, characterized in that, include: The system comprises a grouting system for crushed stone grouting piles (1), a drilling system for crushed stone grouting piles, a vertical bearing capacity testing system for crushed stone grouting piles (2), a continuous physical field measurement system (3), a model box (4), and a mounting frame (5). The mounting frame (5) has the model box (4) at its bottom. The model box (4) is filled with transparent soil, and the drilling system for crushed stone grouting piles drills holes in the transparent soil. The grouting system for crushed stone grouting piles (1) grouts the holes drilled by the drilling system to form crushed stone grouting piles. The vertical bearing capacity testing system for crushed stone grouting piles (2) tests the vertical bearing capacity of the crushed stone grouting piles. The continuous physical field measurement system (3) is located on the side of the crushed stone grouting piles to collect image information during the grouting process and the vertical bearing capacity testing process. The crushed stone grouting pile drilling system includes a lead screw stepper motor (61), which is detachably connected to the top of the mounting frame (5). The lead screw stepper motor (61) is connected to the control system (15). The output shaft of the lead screw stepper motor (61) is threadedly connected to a thin-walled sleeve soil sampler (62). The lead screw stepper motor (61) drives the thin-walled sleeve soil sampler (62) to drill holes in the transparent soil. The vertical bearing capacity testing system (2) for crushed stone grouting piles includes a force gauge (22), which is threadedly connected to the output shaft of the lead screw stepper motor (61); a force transmission rod (23) is connected to the bottom of the force gauge (22); the bottom of the force transmission rod (23) is provided with a threaded hole, and the force transmission rod (23) is threadedly connected to a vertical bearing capacity testing loading plate (24) or a pre-compression consolidation loading plate (27) through the threaded hole. The bottom of the force transmission rod (23) is connected to the pre-compression consolidation loading plate (27), which applies pressure to consolidate the transparent soil inside the model box (4). The structure of the pre-compression consolidation loading plate (27) is the same as the horizontal cross-section of the model box (4), and several through holes are evenly distributed on the pre-compression consolidation loading plate (27). The bottom of the force transmission rod (23) is connected to the vertical bearing capacity test loading plate (24), which tests the vertical bearing capacity of the crushed stone grouting pile.

2. The transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to claim 1, characterized in that: The grouting system (1) for the crushed stone grouting pile includes an automatic lifter (11), which is detachably connected to the top of the mounting frame (5); the automatic lifter (11) is connected to the grouting end of the grouting pipe (19) and drives the grouting end to move up and down; the other end of the grouting pipe (19) is connected to a grouting tank (13) equipped with an electric mixer; the grouting tank (13) is located on the top of the mounting frame (5); an electrically controlled valve (12) is provided on the grouting pipe (19). The grouting tank (13) is connected to the air compressor (17) via a pneumatic pipe. The air compressor (17) is electrically connected to the pressure controller (16). A digital pressure gauge (14) is provided on the pneumatic pipe. The pressure controller (16), the digital pressure gauge (14), and the automatic lifter (11) are all connected to the control system (15).

3. The transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to claim 2, characterized in that: The continuous physical field measurement system (3) includes a mirror reflection base (38) and an industrial camera (32). The mirror reflection base (38) is located at the bottom of the model box (4). A reflector (381) is provided on the mirror reflection base (38). The reflector (381) reflects the laser beam emitted by the laser instrument (31). The laser beam enters the model box (4) vertically from the bottom of the model box (4). The industrial camera (32) is located at the bottom of the mounting frame (5) through a camera fixing bracket (33). The center of the camera lens of the industrial camera (32) is on the same horizontal line as the geometric center of the crushed stone grouting pile. The model box (4) is made of transparent organic glass.

4. The transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles according to claim 3, characterized in that: The mounting bracket (5) includes an upper base plate and a lower base plate, which are connected by a connecting rod. The upper base plate has mounting holes, and the automatic lifter (11) or the lead screw stepper motor (61) is connected to the upper base plate through the mounting holes.

5. A test method using the transparent soil model test system for testing the grouting consolidation and bearing capacity of crushed stone grouting piles as described in any one of claims 1 to 4, characterized in that, Includes the following steps: S1: Preparation of transparent soil; S2: Drill holes for gravel grouting piles in the transparent soil and fill the holes with gravel; S3: Grout the pile holes of the crushed stone grouting pile to form a crushed stone grouting pile; and record the grouting process; S4: Perform a vertical bearing capacity test on the crushed stone grouting pile and record the test process.

6. The test method according to claim 5, characterized in that, S1 includes: S101: Preparation of porous liquid; No. 15 white oil and n-dodecane were added and mixed in a square transparent box to obtain a porous liquid; S102: Test the refractive index of the porous liquid; the refractive index of the porous liquid is tested using an Abbe refractometer. If the refractive index of the porous liquid is the same as that of fumed silica, it indicates that the refractive index of the porous liquid is qualified. S103: Preparation of transparent soil; transparent soil is prepared by adding fumed silica to the pore liquid and stirring, wherein the mass ratio of the pore liquid to the fumed silica is in the range of 12:1 to 14:1; hollow glass bead powder with a volume ratio of 0.1% to 0.3% is added to the transparent soil as tracer particles. S104: Vacuum degassing; The transparent soil is placed into the model box (4), and the model box (4) is placed in a vacuum chamber for more than 6 hours to remove the air inside the transparent soil; S105: Pressure consolidation; a layer of filter paper is laid on the surface of the transparent soil in the model box (4), and the model box (4) is placed inside the mounting frame (5); a pre-pressure consolidation loading plate (27) is installed at the bottom of the force transmission rod (23); the step-by-step loading pressure and the preset consolidation pressure are set in the control system (15); the lead screw stepper motor (61) drives the pre-pressure consolidation loading plate (27) to press down step by step to compact and consolidate the transparent soil until the consolidation pressure reaches the preset consolidation pressure, and then the pressure is stopped.

7. The test method according to claim 6, characterized in that, S2 includes: S201: Drill the pile hole for the crushed stone grouting pile; install a thin-walled sleeve soil sampler (62) below the lead screw stepper motor (61) and position the center of the thin-walled sleeve soil sampler (62) directly above the geometric center of the model box (4); drive the lead screw stepper motor (61) to insert the thin-walled sleeve soil sampler (62) downward into the transparent soil and then lift it upward to complete the soil sampling, and the crushed stone grouting pile hole is formed after the soil sampling. S202: Set up grouting pipe (19) for grouting: Install an automatic lifter (11) on the top of the mounting frame (5) and place the grouting pipe (19) on the automatic lifter (11); the automatic lifter (11) drives the grouting end of the grouting pipe (19) to extend into the pile hole of the crushed stone grouting pile; S203: Fill the pile hole of the crushed stone grouting pile with crushed stone; S204: Pre-grouting preparation; Adjust the reflector (381) and the laser (31) so that the laser beam emitted by the laser (31) is reflected by the reflector (381) and enters the model box (4) vertically from the bottom of the model box (4), covering all the transparent soil around the crushed stone grouting pile; Debug the industrial camera (32), fix the industrial camera (32) to the camera mounting bracket (33) with bolts, and make the camera center of the industrial camera (32) flush with the geometric center of the model box (4); debug the laser exposure parameters of the industrial camera (32), and set the shooting rate and storage path; Set the grouting pressure and the grouting pipe lifting speed; set the grouting pressure of the air compressor (17) and the lifting speed of the automatic lifter (11) through the control system (15), the lifting speed of the automatic lifter (11) is the grouting pipe lifting speed.

8. The test method according to claim 7, characterized in that, S3 includes: S301: Prepare slurry; Mix epoxy resin component A and component B to obtain slurry, and pour the slurry into grouting tank (13), and start the electric stirrer to stir the slurry; S302: Grouting is performed; the air compressor (17) is turned on, and the control system (15) controls the air compressor (17) to provide pressure according to the grouting pressure; the digital pressure gauge (14) detects the air pressure pipe pressure and sends it to the control system (15); the control system (15) determines that the air pressure pipe pressure has reached the grouting pressure and then controls the electric control valve (12) to open and start grouting. The control system (15) controls the automatic lifter (11) to lift upward according to the lifting speed of the grouting pipe; S303: Recording; The grouting control system (15) controls the industrial camera (32) to capture image information; After the grout overflows from the surface of the crushed stone grouting pile hole, the air compressor (17) and the industrial camera (32) are turned off to stop grouting and recording.

9. The test method according to claim 7, characterized in that, S4 includes: S401: Crushed stone grouting pile body solidification; After the crushed stone grouting pile body is left to stand for curing for more than 24 hours until all the grouting liquid in the pile body is completely solidified; the crushed stone grouting pile is completed. S402: Prepare for vertical bearing capacity testing; install a vertical bearing capacity test loading plate (24) at the bottom of the force transmission rod (23) and make the geometric center of the vertical bearing capacity test loading plate (24) directly above the geometric center of the crushed stone grouting pile; turn on the laser (31) and the industrial camera (32). S403: Start testing; The lead screw stepper motor (61) drives the vertical bearing capacity test loading plate (24) to move downward to apply the load pressure for vertical bearing capacity testing to the crushed stone grouting pile; During the test, the control system (15) controls the vertical bearing capacity test loading plate (24) to apply load pressure to the crushed stone grouting pile step by step through the lead screw stepper motor (61); the force gauge (22) collects the load pressure and sends it to the control system (15); the control system (15) determines that the load pressure of each level has reached stability and then controls the vertical bearing capacity test loading plate (24) to apply the next level of load pressure; The control system (15) used in the detection process controls the industrial camera (32) to capture image information; S404: Inspection complete; once the settlement of the crushed stone grouting pile body changes abruptly or the cumulative settlement exceeds one-tenth of the diameter of the crushed stone grouting pile body, the crushed stone grouting pile body is considered to be damaged; stop filming.

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