Visual model test method for pile-forming load of high-pressure water jet slide-resistant pile

Abstract

The invention provides a high-pressure water jet slide-resistant pile forming load visualization model test method based on a transparent rock technology. According to the method, silica gel powder and mineral oil are mixed to prepare a transparent rock to simulate an actual rock mass, and the pile forming and loading processes of the slide-resistant pile are recorded and analyzed in combination with high-pressure water jet slide-resistant pile forming equipment and a PIV technology. High-pressure water jet and drill bit rotary tunneling are matched for drilling. Wherein the high-pressure water jet is divided into bottom jet and side jet, the bottom jet is provided with a jet hole, the side is provided with six auxiliary jet holes, and the jet speed can be changed by the power of an oil pump. And after pile forming operation of one anti-slide pile is completed, the high-pressure water jet anti-slide pile forming device is moved to the corresponding point positions of other anti-slide piles through the first sliding rail and the second sliding rail to continue operation, and then weights are applied to complete a load bearing test. According to the method, the transparent rock technology and the high-pressure water jet technology are fused, and the research visualization level of the whole anti-slide pile forming and loading process is improved.

Description

Technical Field

[0001] The present invention relates to the field of anti-slide pile tests, and particularly to a visual model test method for the formation and loading of high-pressure water jet anti-slide piles. Background Technique

[0002] An anti-slide pile is a pile column structure that penetrates through a landslide mass and extends into a stable sliding bed, used to effectively resist the downward sliding force of the landslide mass and play a role in retaining and fixing. Its main function is to transfer the sliding force of the landslide mass to the stable stratum below, thereby significantly improving the overall stability of the slope. This engineering measure is particularly suitable for the treatment of landslides with a small thickness of the landslide mass and a shallow sliding surface, and is one of the most widely used technologies in the current field of slope reinforcement and anti-slide treatment. The design and construction of anti-slide piles are usually optimized according to the geological conditions of the landslide, the thickness of the sliding mass, and the bearing capacity of the sliding bed. The pile body forms a reverse supporting force against the landslide mass by embedding into the stable layer of the sliding bed, and can effectively prevent the continued sliding of the sliding mass. Due to the characteristics of mature construction technology, wide application range, and small environmental disturbance of anti-slide piles, they have been widely used in the fields of highway slope reinforcement, urban building group protection, and reservoir landslide treatment.

[0003] The high-pressure water jet pile-forming technology is a technology that uses the impact force, shear force, and crushing force of high-pressure water flow to cut and disturb rock and soil masses. It sprays water flow at an extremely high speed into the soil through a high-pressure water jet device. While cutting and crushing the soil layer, it forms a cavity with a specific shape in the pile hole, and fills it with slurry, concrete, or other filling materials to finally form a pile body with a certain bearing capacity. This technology is applicable to various engineering scenarios such as soft foundation treatment, slope reinforcement, and diaphragm wall construction. The high-pressure water jet pile-forming technology has the advantages of high-efficiency cutting, small environmental disturbance, precise controllability, and strong construction flexibility, and has been widely used at present.

[0004] The transparent geotechnical technology is an emerging experimental technology that uses transparent media to simulate the mechanical and fluid behaviors of real geotechnical materials, providing an intuitive observation means for studying geotechnical engineering problems. By matching the characteristics of geotechnical materials with the physical properties of transparent media, this technology can simulate phenomena such as stress distribution, deformation, crack propagation, and fluid migration inside the soil mass in a laboratory environment. The transparent geotechnical technology is widely used in the fields of geotechnical engineering, groundwater mechanics, geological disaster simulation, etc., providing a visual solution for the study of complex geological problems.

[0005] The high-pressure water jet anti-slide pile is an efficient landslide control and slope reinforcement technology. Its pile-forming process and loading characteristics directly affect the stability of the slope and the long-term performance of the pile. However, due to the complexity inside the landslide mass and the limitations of traditional experimental techniques, it is difficult to visually observe and quantify the details of the pile-forming process, the stress state of the pile, and the pile-soil interaction. Therefore, the research on the visualization model test method for the whole process of pile-forming and loading of high-pressure water jet anti-slide piles based on transparent rock is of great significance. The research on the visualization model test method for the whole process of pile-forming and loading of high-pressure water jet anti-slide piles based on transparent rock can not only make up for the deficiencies of traditional experimental techniques but also provide a certain scientific basis for optimizing design parameters, improving construction techniques, and verifying theoretical models. Summary of the Invention

[0006] The purpose of the present invention is to provide a visualization model test method for the pile-forming and loading of high-pressure water jet anti-slide piles to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A visualization model test method for the pile-forming and loading of high-pressure water jet anti-slide piles, the test method comprising the following steps:

[0008] S1: Arrange the test device. The test device includes a transparent soil model box, transparent rock placed in the transparent soil model box, a CCD industrial camera and a sheet laser erected through a visual experiment support, and the two are distributed outside two adjacent sides of the transparent soil model box. The position of the CCD industrial camera is relatively fixed with respect to the transparent soil model box. A laser slide rail is provided at the bottom of the sheet laser, and the sheet laser slides on the laser slide rail. A high-pressure water jet anti-slide pile forming device is provided at the top of the transparent soil model box through a sliding component;

[0009] S2: Level the transparent rock according to the site characteristics. Weights for compaction are placed on the top of the transparent rock, and the weights are used to increase the weight of the transparent rock so as to simulate real rock;

[0010] S3: Start the CCD industrial camera and the sheet laser;

[0011] S4: Move the high-pressure water jet anti-slide pile forming device to the corresponding position of the anti-slide pile through the sliding component to make a pile hole;

[0012] S5: Pour epoxy resin slurry. When the pile hole is formed, inject epoxy resin slurry into the pile hole;

[0013] S6: Move the high-pressure water jet anti-slide pile forming device to the corresponding positions of the remaining anti-slide piles through the sliding component and continue the operation;

[0014] S7: Wait for the epoxy resin slurry to solidify to obtain an epoxy resin pile, add the number of the weights, and observe the deformation of the epoxy resin pile under load;

[0015] S8: Add the number of the weights one by one until the failure condition of the epoxy resin pile is reached, end the test, stop placing the weights, turn off the CCD industrial camera and the sheet laser, and complete the capture of the speckle field of the formed pile of the high-pressure water jet anti-slide pile under load.

[0016] Further, the transparent rock is trapezoidal, and the anti-slide piles are distributed within the slope of the transparent rock.

[0017] Further, the sliding assembly includes a second slide rail fixedly installed on the top of the transparent rock, and a horizontal sliding block is slidably assembled on the top of the second slide rail. A first slide rail is fixedly arranged on the top of the horizontal sliding block. The horizontal sliding block and the first slide rail are vertically distributed with respect to the second slide rail, and the high-pressure water jet anti-slide pile forming device is slidably assembled on the top of the first slide rail.

[0018] Further, the high-pressure water jet anti-slide pile forming device includes a drill bit, and a drill rod outer wall is arranged on the top of the drill bit. A first injection pipe and a second injection pipe are respectively arranged inside the drill rod outer wall. A first injection hole and a second injection hole are respectively arranged at the bottom and inside of the drill bit. The first injection pipe is communicated with the first injection hole, and the second injection pipe is communicated with the second injection hole. A rotating assembly is arranged on the top of the drill rod outer wall. The first injection pipe and the drill rod outer wall are both threadedly connected with the rotating assembly, and the drill bit is also threadedly connected with the first injection pipe. An electric push rod is arranged on the top of the rotating assembly. The electric push rod is slidably assembled with the first slide rail, and the output end of the electric push rod is fixed to the top of the rotating assembly.

[0019] Further, an oil pump and an epoxy resin slurry pump are relatively fixedly arranged outside the electric push rod. A three-way pipe is arranged between the oil pump and the epoxy resin slurry pump. The last port of the three-way pipe is butt-connected and communicated with the first injection pipe and the second injection pipe. First valves and second valves are respectively assembled at the butt joints of the three-way pipe with the oil pump and the epoxy resin slurry pump.

[0020] Further, the electric push rod drives the high-pressure water jet anti-slide pile forming device to move up and down, the rotating assembly controls the rotation of the first injection pipe and the drill bit, and at the same time, the drill rod outer wall does not rotate.

[0021] Furthermore, a loading plate is also arranged between the top of the transparent rock and the weight, and the loading plate is used to improve the connection stability between the two. A fixing bracket is also fixedly arranged on the outer wall of the transparent soil model box.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. The present invention combines the transparent rock technology and the high-pressure water jet technology, significantly improving the visualization level of the research on the whole process of anti-slide pile pile formation and loading; it can directly capture the deformation behavior and the details of pile-soil interaction during the whole process of anti-slide pile pile formation and loading, providing a visualization solution for the mechanical phenomena that are difficult to observe by traditional experimental methods.

[0024] 2. In the present invention, the position of the drill bit of the high-pressure water jet anti-slide pile pile-forming device and the type of the jet pipeline can be flexibly adjusted according to the characteristics of the landslide body, which can be applied to the research of anti-slide pile construction technology under different conditions.

[0025] 3. For different pile-forming positions, the sheet laser can be moved to capture the speckle field of the anti-slide pile pile-forming process at different cross-sections, and the displacement field during the pile-forming and loading process can be comprehensively obtained. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of a visual model test for the formation and loading of a high-pressure water jet anti-slide pile;

[0027] Figure 2 It is a schematic diagram of the loading and loading of a high-pressure water jet anti-slide pile after pile formation;

[0028] Figure 3 It is a schematic diagram of the process of forming a high-pressure water jet anti-slide pile;

[0029] Figure 4 It is a schematic diagram of the completion of the formation of a high-pressure water jet anti-slide pile;

[0030] Figure 5 It is a schematic diagram of the structure of a high-pressure water jet anti-slide pile pile-forming device;

[0031] Figure 6 It is a sectional view taken along the A-A section.

[0032] In the figure: 1. Transparent soil model box; 2. High-pressure water jet anti-slide pile forming device; 3. Fixed bracket; 4. Horizontal sliding block; 5. First slide rail; 6. Second slide rail; 7. CCD industrial camera; 8. Vision experiment bracket; 9. Sheet laser; 10. Laser slide rail; 11. Transparent rock; 12. Oil pump; 13. Epoxy resin slurry pump; 14. Electric push rod; 15. Epoxy resin pile; 16. First valve; 17. Second valve; 18. Pile hole; 19. Loading plate; 20. Weight; 201. First injection hole; 202. Second injection hole; 203. Drill bit; 204. First injection pipeline; 205. Second injection pipeline; 206. Outer wall of drill pipe; 207. Rotating assembly. Detailed implementation manner

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figures 1-6 , a visualization model test method for the load-bearing of high-pressure water jet anti-slide pile formation in the figure. The test method includes the following steps:

[0036] S1: Arrange the test device. The test device includes a transparent soil model box 1, a transparent rock 11 placed in the transparent soil model box 1, a CCD industrial camera 7 and a sheet laser 9 are erected through a vision experiment bracket 8, and the two are distributed outside two adjacent sides of the transparent soil model box 1. The position of the CCD industrial camera 7 is relatively fixed with respect to the transparent soil model box 1. The bottom of the sheet laser 9 is provided with a laser slide rail 10, and the sheet laser 9 slides on the laser slide rail 10. The sheet laser 9 irradiates the transparent rock 11 from the vertical direction and can slide through the laser slide rail 10 to capture the speckle fields of different cross-sections;

[0037] S2: Level the transparent rock 11 according to the site characteristics. Weights 20 for compaction are placed on the top of the transparent rock 11. The weights 20 are used to increase the weight of the transparent rock 11 to simulate real rock. The transparent rock 11 is made of a mixture of 200 - 300 mesh silica powder and mineral oil. When the mass ratio of liquid paraffin to n-tridecane in the mineral oil is about 1:0.84, the refractive index is 1.445. Then it is put into a vacuum box for vacuum pumping and then filled into the transparent soil model box 1;

[0038] S3: Start the CCD industrial camera 7 and the sheet laser 9;

[0039] S4: Move the high-pressure water jet anti-slide pile forming device 2 to the corresponding position of the anti-slide pile through the sliding assembly to make the pile hole 18;

[0040] S5: Pour the epoxy resin slurry. After the pile hole 18 is formed, inject the epoxy resin slurry into the pile hole 18;

[0041] S6: Move the high-pressure water jet anti-slide pile forming device 2 to the corresponding positions of the remaining anti-slide piles through the sliding assembly and continue the operation;

[0042] S7: Wait for the epoxy resin slurry to solidify to obtain the epoxy resin pile 15, add the number of weights 20, and observe the load-bearing deformation of the epoxy resin pile 15;

[0043] S8: Add the number of weights 20 one by one until the failure condition of the epoxy resin pile 15 is reached, end the test, stop placing the weights 20, turn off the CCD industrial camera 7 and the sheet laser 9, and complete the capture of the load-bearing speckle field of the high-pressure water jet anti-slide pile forming;

[0044] The transparent rock 11 is trapezoidal, and the anti-slide piles are distributed within the slope of the transparent rock 11.

[0045] The sliding assembly includes a second slide rail 6 fixedly installed on the top of the transparent rock 11. A horizontal sliding block 4 is slidably assembled on the top of the second slide rail 6. A first slide rail 5 is fixedly arranged on the top of the horizontal sliding block 4. The horizontal sliding block 4 and the first slide rail 5 are vertically distributed with respect to the second slide rail 6. The high-pressure water jet anti-slide pile forming device 2 is slidably assembled on the top of the first slide rail 5.

[0046] The high-pressure water jet anti-slide pile forming device 2 includes a drill bit 203. A drill pipe outer wall 206 is arranged on the top of the drill bit 203. A first injection pipe 204 and a second injection pipe 205 are respectively arranged inside the drill pipe outer wall 206. A first injection hole 201 and a second injection hole 202 are respectively arranged at the bottom and inside of the drill bit 203. The first injection pipe 204 is communicated with the first injection hole 201, and the second injection pipe 205 is communicated with the second injection hole 202. A rotating assembly 207 is arranged on the top of the drill pipe outer wall 206. The first injection pipe 204 and the drill pipe outer wall 206 are both threadedly connected to the rotating assembly 207. The drill bit 203 is also threadedly connected to the first injection pipe 204. An electric push rod 14 is arranged on the top of the rotating assembly 207. The electric push rod 14 is slidably assembled with the first slide rail 5, and the output end of the electric push rod 14 is fixed to the top of the rotating assembly 207.

[0047] An oil pump 12 and an epoxy resin slurry pump 13 are also relatively fixedly arranged outside the electric push rod 14. A three-way pipe is arranged between the oil pump 12 and the epoxy resin slurry pump 13, and the last port of the three-way pipe is docked and communicated with the first injection pipeline 204 and the second injection pipeline 205. First valves 16 and second valves 17 are respectively assembled at the docking positions of the three-way pipe with the oil pump 12 and the epoxy resin slurry pump 13.

[0048] The electric push rod 14 drives the high-pressure water jet anti-sliding pile forming device 2 to move up and down, and the rotating assembly 207 controls the rotation of the first injection pipeline 204 and the drill bit 203 of the 203 drill pipe, and at the same time, the outer wall 206 of the drill pipe does not rotate.

[0049] A loading plate 19 is also arranged between the top of the transparent rock 11 and the weight 20, and the loading plate 19 is used to improve the connection stability between the two. A fixed bracket 3 is also fixedly arranged on the outer wall of the transparent soil model box 1.

[0050] Lower the rotating assembly 207 through the electric push rod 14 to make the drill bit 203 contact the transparent rock 11. Under the action of the rotating assembly 207, make the drill bit 203 and the oil pump 12 rotate, and at the same time turn on the high-pressure water jet. Among them, the rotating assembly 207 is equivalent to a motor; the first valve 16 controls the operation of the oil pump 12, and the second valve 17 controls the operation of the epoxy resin slurry pump 13; before the test, the oil pump 12 should be connected with mineral oil having the same refractive index as the transparent rock 11 as the water jet liquid, and the epoxy resin slurry pump 13 needs to be connected with epoxy resin slurry; the high-pressure water jet operation is implemented by the first injection hole 201 at the bottom and the six second injection holes 202 on the side. The oil injection speed of the first injection hole 201 at the bottom and the second injection holes 202 can be changed by the power of the oil pump 12 to control the speed of breaking the transparent rock 11.

[0051] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for visualizing the load of a high-pressure water jet anti-sliding pile, characterized in that: The test method comprises the following steps: S1: Arrange the test device, a transparent soil model box (1), a transparent rock (11) placed in the transparent soil model box (1), a CCD industrial camera (7) and a sheet laser (9) set up via a visual experiment bracket (8), and a high-pressure water jet anti-sliding pile forming device (2) is set on the top of the transparent soil model box (1) via a sliding assembly; S2: A weight (20) is placed on the top of the transparent rock (11); S3: moving the high-pressure water jet anti-sliding pile forming device (2) to a corresponding point of the anti-sliding pile by means of the sliding assembly to form a pile hole (18); S4: pouring epoxy resin slurry into the pile hole (18); S5: moving the high-pressure water jet anti-sliding pile forming device (2) to the corresponding points of the remaining anti-sliding piles through the sliding assembly to continue the operation; S6: the epoxy resin slurry solidifies to obtain the epoxy resin pile (15), the weights (20) are added, and the load condition of the epoxy resin pile (15) is observed; S7: adding the weights (20) in such quantity that the epoxy resin pile (15) is destroyed, and the test is ended. The CCD industrial camera (7) and the sheet laser (9) are used to capture the loaded speckle field of the high-pressure water jet anti-slip pile.

2. A method for visualizing the load of a high-pressure water jet anti-sliding pile according to claim 1, characterized in that: The transparent rock (11) is in a trapezoidal shape, and the anti-slide piles are distributed in the slope of the transparent rock (11).

3. A method for visualizing the load of a high-pressure water jet anti-sliding pile according to claim 1, characterized in that: The sliding assembly comprises a second slide rail (6) fixedly mounted on the top of the transparent rock (11), and a horizontal slide block (4) is slidably mounted on the top of the second slide rail (6), and a first slide rail (5) is fixedly arranged on the top of the horizontal slide block (4), and the horizontal slide block (4) and the first slide rail (5) are vertically distributed with the second slide rail (6), and the high-pressure water jet anti-sliding pile forming device (2) is slidably mounted on the top of the first slide rail (5).

4. A method for visualizing the load of a high-pressure water jet anti-sliding pile according to claim 3, characterized in that: The high-pressure water jet anti-sliding pile forming device (2) comprises a drill bit (203), and a drill rod outer wall (206) is arranged on the top of the drill bit (203), and a first injection pipeline (204) and a second injection pipeline (205) are respectively arranged inside the drill rod outer wall (206), and a first injection hole (201) and a second injection hole (202) are respectively arranged at the bottom of the drill bit (203) and inside the drill bit (203), the first injection pipeline (204) is connected to the first injection hole (201), and the second injection pipeline (205) is connected to the second injection hole (202). The injection hole (202) is connected, a rotating assembly (207) is arranged on the top of the drill rod outer wall (206), the first injection pipe (204) and the drill rod outer wall (206) are all threadedly connected to the rotating assembly (207), the drill bit (203) and the first injection pipe (204) are also threadedly connected, an electric push rod (14) is arranged on the top of the rotating assembly (207), the electric push rod (14) and the first slide rail (5) are slidably assembled, and the output end of the electric push rod (14) is fixed to the top of the rotating assembly (207).

5. A method for visualizing the load of a high-pressure water jet anti-sliding pile according to claim 4, characterized in that: An oil pump (12) and an epoxy resin slurry pump (13) are relatively fixedly arranged on the outside of the electric push rod (14), a three-way pipe is arranged between the oil pump (12) and the epoxy resin slurry pump (13), and the last port of the three-way pipe is connected to the first injection pipeline (204) and the second injection pipeline (205), and the joints between the three-way pipe and the oil pump (12) and the epoxy resin slurry pump (13) are respectively equipped with a first valve (16) and a second valve (17).

6. A method for visualizing the load-bearing model of high-pressure water jet anti-sliding piles according to claim 4, characterized in that: The electric push rod (14) drives the high-pressure water jet anti-slip pile forming device (2) to move up and down, and the rotating component (207) controls the first jet pipe (204) and the drill bit (203) to rotate, while the outer wall of the drill rod (206) does not rotate.

7. The method for visualizing the load-bearing model of high-pressure water jet anti-sliding piles according to claim 1 is characterized by: A loading plate (19) is also provided between the top of the transparent rock (11) and the weight (20), and the loading plate (19) is used to improve the stability of the connection between the two. A fixing bracket (3) is also fixedly provided on the outer wall of the transparent soil model box (1).

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