A device and method for model testing in a rock and soil borehole

Abstract

The present invention discloses a device for model testing in a borehole of a rock and soil body. A support plate, a pressure plate, and a mounting plate are sequentially arranged above a bottom plate. The bottom plate, the support plate, the pressure plate, and the mounting plate are connected by an adjustment structure. A pressure plate is arranged on the top of a lifting element on the bottom plate. A force sensor is arranged on the pressure plate. A through hole matching the pressure plate is arranged on the support plate. A model box is arranged on the support plate. A hole wall testing mechanism is arranged on the support plate. An in-hole testing mechanism is arranged on the mounting plate. A avoidance hole 1 for the in-hole testing mechanism to pass through is arranged on the pressure plate. The hole wall testing mechanism and the force sensor are connected to a computer via a data collector. The present invention also discloses a method for a device for model testing in a borehole of a rock and soil body. The present invention adopts the above-mentioned device and method for model testing in a borehole of a rock and soil body, which can solve the problem that the existing rock and soil body test cannot simulate the actual force, resulting in large errors in the test.

Description

Technical Field

[0001] The invention relates to the technical field of rock and soil body testing, and in particular to a device and method for rock and soil body borehole model testing. Background Art

[0002] In the field of geotechnical engineering and geological engineering, it is generally necessary to drill stratum rock and soil samples for indoor testing to determine the physical and mechanical properties of the rock and soil, so as to facilitate reasonable design calculations and reinforcement construction of buildings. In fact, drilling stratum rock and soil samples will destroy the in-situ stress state and microstructure of the rock and soil, resulting in a certain error between the values ​​of the physical and mechanical properties of the rock and soil measured indoors and the actual values ​​of the physical and mechanical properties of the rock and soil in situ. Therefore, it is necessary to develop a test device that can simulate the actual stress of the rock and soil to reduce the test error. Summary of the invention

[0003] The purpose of the present invention is to provide a device for model testing in a rock and soil borehole, so as to solve the problem that the existing rock and soil tests cannot simulate the actual stress, resulting in large errors in the test. Another purpose of the present invention is to provide a method for model testing device in a rock and soil borehole.

[0004] To achieve the above-mentioned purpose, the present invention provides a device for model testing in a rock and soil body borehole, comprising a base plate, a support plate is arranged above the base plate, a pressure plate is arranged above one end of the support plate, a mounting plate is arranged above the pressure plate, and the base plate, the support plate, the pressure plate and the mounting plate are connected by an adjustment structure; a lifting element is arranged on the base plate, a pressure plate is arranged on the top of the lifting element, a force sensor for measuring the lifting force is arranged on the pressure plate, a through hole matched with the pressure plate is arranged on the support plate, a model box is arranged on the support plate, the model box is located directly above the through hole, and the pressure plate is located directly above the model box; a hole wall testing mechanism is arranged on the support plate, the hole wall testing mechanism is located on one side of the model box, an in-hole testing mechanism is arranged on the mounting plate, the in-hole testing mechanism is located directly above the model box, and an avoidance hole one is arranged on the pressure plate for the in-hole testing mechanism to pass through; the hole wall testing mechanism and the force sensor are connected to a computer through a data acquisition device, and the computer, the lifting element and the hole wall testing mechanism are connected to a power supply.

[0005] Preferably, the adjustment structure includes screw rod 2, and through holes for screw rod 2 to pass through are provided on the base plate, support plate, pressure plate and mounting plate, and limited nuts are provided on the upper and lower surfaces of the base plate, support plate, pressure plate and mounting plate, and the nuts are sleeved on screw rod 2.

[0006] Preferably, a screw rod 1 is provided at one end of the base plate and one end of the support plate, and through holes for the screw rod 1 to pass through are provided on the base plate and the support plate. Limiting nuts are provided on the upper and lower surfaces of the base plate and the support plate, and the nuts are sleeved on the screw rod 1.

[0007] Preferably, the model box is a rectangular structure with three closed sides and one open side, the upper top surface and the lower bottom surface of the model box are open, the interior of the model box is provided with side panel one or side panel two for closing the open side, and the middle part of side panel two is provided with an inwardly concave semi-cylindrical mold.

[0008] Preferably, the lifting element is a jack, the jack is connected to an oil pump through an oil pipe, the oil pump is connected to a control box, and the control box is connected to a power source.

[0009] Preferably, an installation box for placing the force sensor is provided in the middle of the pressure plate, the side wall of the installation box is connected to the pressure plate through a plurality of stiffening plates, a notch is provided on the side wall of the installation box for allowing the wire of the force sensor to pass through, and the force sensor is connected to a data collector.

[0010] Preferably, a cover plate for closing the avoidance hole is provided on the avoidance hole 1 of the pressure plate, and a convex block matched with the avoidance hole 1 is provided on the lower surface of the cover plate, and the lower surface of the convex block is flush with the lower surface of the pressure plate.

[0011] Preferably, the hole wall testing mechanism includes a reaction force seat, which is fixed on the support plate, and the reaction force seat is connected to the electric cylinder through a flange seat. A force sensor 1 is threadedly connected to the push rod of the electric cylinder, and the force sensor 1 is connected to the probe through a connecting pipe. The two ends of the connecting pipe are respectively threaded with the force sensor 1 and the probe, and an opening is provided on the connecting pipe for the probe wire to pass through. The probe, force sensor 1, and the electric cylinder are all connected to the data collector.

[0012] Preferably, the in-hole testing mechanism includes supports, which are relatively arranged on the mounting plate, a rotating shaft is arranged between the supports, the rotating shaft is rotatably connected to the supports, a crank is arranged at one end of the rotating shaft to drive the rotating shaft to rotate, a steel wire rope is wound around the rotating shaft, an in-hole in-situ tester is arranged at the bottom of the steel wire rope, and an avoidance hole 2 is arranged on the mounting plate for allowing the in-situ tester to pass through.

[0013] The above method for the rock and soil body borehole model test device comprises the following steps:

[0014] S1. Turn the nut to adjust the distance between the pressure plate and the support plate to facilitate the filling of rock and soil into the model box. The jack drives the pressure plate to rise so that the upper surface of the pressure plate is flush with the upper surface of the support plate.

[0015] S2. Place the side plate 1 on the open side of the model box, fill the model box with rock and soil, use a drill bit to drill a hole in the middle of the rock and soil to form an in-hole test model, and adjust the nut so that the lower surface of the pressing plate contacts the top surface of the model box;

[0016] Or place the second side plate on the open side of the model box, fill the model box with rock and soil, then take out the second side plate to form a hole wall test model, put the convex block of the cover plate into the avoidance hole one, fix the cover plate and the pressure plate with screws, and adjust the nuts to make the lower surface of the pressure plate contact with the top surface of the model box;

[0017] S3, the jack drives the pressure plate to rise until the pressure of the force sensor reaches the target value P, maintaining a constant pressure;

[0018] S4. The handle drives the rotating shaft to rotate, and the in-hole in-situ tester descends into the middle hole of the in-hole test model to perform the test;

[0019] Or the electric cylinder drives the power sensor and the probe to move at a specific speed to perform a loading test on the hole wall of the hole wall test model.

[0020] The advantages and positive effects of the device and method for model testing in a rock and soil borehole described in the present invention are:

[0021] 1. The uniformity of the mechanical properties of the rock and soil in the model box is improved by setting the jack, pressure plate and pressure plate, which can effectively simulate the vertical stress conditions of the rock and soil drilling geological model.

[0022] 2. It is convenient to carry out model test research in rock and soil boreholes.

[0023] 3. Realize the loading test of the rock and soil mass on the hole wall of the geological model drill hole along the radial direction of the rotating hole.

[0024] 4. The structures are mostly connected by threads and bolts, which are easy to disassemble and transport and can be reused.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of an in-hole testing mechanism of an embodiment of a device and method for in-hole model testing of rock and soil bodies of the present invention;

[0028] Figure 3 A schematic diagram of the structure of a hole wall testing mechanism of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0029] Figure 4 A schematic diagram of a reaction seat structure of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0030] Figure 5 A schematic diagram of a support plate structure of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0031] Figure 6 The schematic diagram of the model box structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention is shown in FIG. Figure 1 ;

[0032] Figure 7 The schematic diagram of the model box structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention is shown in FIG. Figure 2 ;

[0033] Figure 8 A schematic diagram of a pressure plate structure of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0034] Fig. 9 A schematic diagram of a cover plate structure of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention;

[0035] Fig.10 A schematic diagram of an in-hole test model structure of an embodiment of a device and method for in-hole model testing of rock and soil bodies of the present invention;

[0036] Fig.11 The present invention is a schematic diagram of a hole wall test model structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention.

[0037] Reference numerals

[0038] 1. Bottom plate; 2. Support plate; 3. Press plate; 4. Mounting plate; 5. Screw rod 1; 6. Screw rod 2; 7. Reaction seat; 8. Flange seat; 9. Electric cylinder; 10. Force sensor 1; 11. Connecting pipe; 12. Probe; 13. Jack; 14. Model box; 15. Avoidance hole 1; 16. In-situ tester in the hole; 17. Wire rope; 18. Avoidance hole 2; 19. Support; 20. Rotating shaft; 21. 1. Crank; 22. Oil pump; 23. Oil pipe; 24. Control box; 25. Computer; 26. Data acquisition unit; 27. Serial data cable; 28. Power supply; 29. ​​Opening; 30. Angle steel; 31. Reinforcement plate; 32. Through hole; 33. Side panel one; 34. Side panel two; 35. Mould; 36. Pressure plate; 37. Reinforced plate; 38. Mounting box; 39. Notch; 40. Cover plate; 41. Bump. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0040] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] Example

[0042] Figure 1 It is a schematic diagram of the structure of an embodiment of a device and method for model testing in a borehole of a rock and soil body of the present invention. As shown in the figure, a device for model testing in a borehole of a rock and soil body comprises a base plate 1, a support plate 2 is arranged above the base plate 1, a pressure plate 3 is arranged above one end of the support plate 2, a mounting plate 4 is arranged above the pressure plate 3, and the base plate 1, the support plate 2, the pressure plate 3 and the mounting plate 4 are connected by an adjustment structure. The adjustment structure comprises a screw rod 6, and a through hole 32 for the screw rod 6 to pass through is arranged on the base plate 1, the support plate 2, the pressure plate 3 and the mounting plate 4. The upper and lower surfaces of the base plate 1, the support plate 2, the pressure plate 3 and the mounting plate 4 are all provided with a limited nut, and the nut is sleeved on the screw rod 6. The height of the base plate 1, the support plate 2, the pressure plate 3 and the mounting plate 4 can be adjusted by turning the nut.

[0043] The length of the bottom plate 1 and the support plate 2 is greater than the length of the pressing plate 3 and the mounting plate 4. A screw rod 5 is provided at one end of the bottom plate 1 and one end of the support plate 2. A through hole 32 is provided on the bottom plate 1 and the support plate 2 for the screw rod 5 to pass through. The upper and lower surfaces of the bottom plate 1 and the support plate 2 are both provided with limited nuts, which are sleeved on the screw rod 5. The stability of the connection between the bottom plate 1 and the support plate 2 is improved.

[0044] Figure 8The present invention is a schematic diagram of a pressure plate structure of an embodiment of a device and method for model testing in a rock and soil borehole. As shown in the figure, a lifting element is provided on the bottom plate 1, a pressure plate 36 is provided on the top of the lifting element, and a force sensor for measuring the lifting force is provided on the pressure plate 36. The lifting element is a hydraulic jack 13, the jack 13 is connected to the oil pump 22 through an oil pipe 23, the oil pump 22 is connected to the control box 24, and the control box 24 is connected to the power supply 28. The jack 13 is operated through the control box 24 to control the lifting and lowering of the jack 13. The pressure plate 36 is fixed to the top of the jack 13 by screws or threads. A mounting box 38 for placing a force sensor is provided in the middle of the upper surface of the pressure plate 36, and the side wall of the mounting box 38 is connected to the pressure plate 36 by a plurality of stiffening plates 37 to improve the support strength of the mounting box 38. A notch 39 is provided on the side wall of the mounting box 38 for the wire of the force sensor to pass through, and the force sensor is connected to the data collector 26. The data collector 26 is connected to the computer 25 via a serial data line 27, and obtains the force sensor data change via the computer 25. The force sensor uses an existing structure.

[0045] Figure 5 The figure is a schematic diagram of a support plate structure of an embodiment of a device and method for model testing in a rock and soil borehole according to the present invention. Figure 6 The schematic diagram of the model box structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention is shown in FIG. Figure 1 , Figure 7 The schematic diagram of the model box structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention is shown in FIG. Figure 2 . As shown in the figure, the support plate 2 is provided with a through hole 32 adapted to the pressure plate 36, and the size of the through hole 32 is equal to that of the pressure plate 36. The support plate 2 is provided with a model box 14, and the model box 14 is located directly above the through hole 32. The pressure plate 3 is located directly above the model box 14. The model box 14 is a rectangular structure with three closed sides and one open side, and the upper top surface and the lower bottom surface of the model box 14 are open. The model box 14 is welded with high-strength steel plates. The interior of the model box 14 is provided with a side panel 1 33 or a side panel 2 34 that closes the side opening, and the middle part of the side panel 2 34 is provided with an inwardly concave semi-cylindrical mold 35. The side panel 1 33 is used when performing in-hole testing, and the side panel 2 34 is used when performing hole wall testing. The mold 35 is used to form a semi-cylindrical hole of the hole wall test model.

[0046] Figure 3 The present invention is a schematic diagram of a hole wall testing mechanism for a device and method for model testing in a rock and soil borehole according to an embodiment of the present invention. Figure 4The present invention is a schematic diagram of a reaction seat structure of an embodiment of a device and method for model testing in a rock and soil borehole. As shown in the figure, a hole wall testing mechanism is provided on the support plate 2, and the hole wall testing mechanism is located on the open side of the model box 14. The hole wall testing mechanism includes a reaction seat 7, and the reaction seat 7 is fixed to the support plate 2 by bolts. The reaction seat 7 includes an angle steel 30, and a reinforcing plate 31 is provided on the outer surface of the angle steel 30 to increase the strength of the reaction seat 7. The reaction seat 7 provides reaction support for the hole wall test. The reaction seat 7 is connected to the electric cylinder 9 through a flange seat 8. The reaction seat 7 is fixedly connected to the flange seat 8 by screws, and the electric cylinder 9 is fixedly connected to the flange seat 8 by bolts. The electric cylinder 9 is an existing structure.

[0047] A force sensor 10 is threadedly connected to the push rod of the electric cylinder 9, and the force sensor 10 is connected to the probe 12 through the connecting tube 11. Both ends of the force sensor 10 are provided with internal threads, which are respectively threadedly connected to the push rod and the connecting tube 11. One end of the probe 12 is provided with an external thread, and the probe 12 is threadedly connected to the connecting tube 11. The connecting tube 11 is provided with an opening 29 for the wire of the probe 12 to pass through, and the probe 12, the force sensor 10, and the electric cylinder 9 are all connected to the data acquisition device 26. The probe 12 is an existing structure with a mechanical sensing element inside, which is used to measure the resistance of the push rod to push the rock and soil of the borehole wall. The force sensor 10 is used to dynamically measure the thrust of the push rod, and the existing structure is selected. The computer 25 is used to read and record the movement displacement of the push rod.

[0048] Fig. 9 The schematic diagram of the cover plate structure of an embodiment of a device and method for model testing in a rock and soil borehole of the present invention. As shown in the figure, a cover plate 40 is provided on the avoidance hole 15 of the pressing plate 3 to close the avoidance hole, and a convex block 41 matching the avoidance hole 15 is provided on the lower surface of the cover plate 40, and the lower surface of the convex block 41 is flush with the lower surface of the pressing plate 3. The size of the convex block 41 is the same as that of the avoidance hole 15, and it fits into the avoidance hole 15. The pressing plate 3 is used when performing a hole wall test.

[0049] The arrangement of the pressure plate 3, the jack 13 and the pressure plate 36 can simulate the stress state of rock and soil bodies at different depths and reduce the error of the test.

[0050] Figure 2The present invention is a schematic diagram of the structure of the in-hole test mechanism of an embodiment of a device and method for model testing in a rock and soil body borehole. As shown in the figure, the in-hole test mechanism is arranged on the mounting plate 4, and the in-hole test mechanism is located directly above the model box 14. The pressure plate 3 is provided with an avoidance hole 15 for the in-hole test mechanism to pass through. The in-hole test mechanism includes a support 19, and the support 19 is relatively arranged on the mounting plate 4, and the support 19 is fixed to the mounting plate 4 by bolts. A rotating shaft 20 is arranged between the supports 19, and the rotating shaft 20 is rotatably connected to the support 19 through a bearing. A crank 21 for driving the rotating shaft 20 to rotate is fixedly arranged at one end of the rotating shaft 20. A steel wire rope 17 is wound around the rotating shaft 20, and the top end of the steel wire rope 17 is fixed on the rotating shaft 20. The bottom of the steel wire rope 17 is fixedly provided with an in-hole in-situ tester 16, and the mounting plate 4 is provided with an avoidance hole 28 for the in-hole in-situ tester 16 to pass through. The in-hole in-situ tester 16 tests the physical properties in the hole, and the existing structure and model can be selected according to the needs.

[0051] The computer 25, the control box 24, the electric cylinder 9, the force sensor and the force sensor 10 are all connected to the power supply 28 to provide them with working power.

[0052] Fig.10 The schematic diagram of the in-hole test model structure of an embodiment of a device and method for in-hole model test of rock and soil body of the present invention. As shown in the figure, the method for in-hole model test device and method for in-hole test of rock and soil body comprises the following steps:

[0053] S1. Turn the nut to adjust the distance between the pressure plate 3 and the support plate 2 to facilitate the filling of the rock and soil into the model box 14. The jack 13 drives the pressure plate 36 to rise so that the upper surface of the pressure plate 36 is flush with the upper surface of the support plate 2.

[0054] S2, placing the side plate 33 on the open side of the model box 14, filling the model box 14 with rock and soil, drilling a hole in the middle of the rock and soil with a drill bit to form an in-hole test model, and adjusting the nut to make the lower surface of the pressing plate 3 contact the top surface of the model box 14;

[0055] S3, the jack 13 drives the pressure plate 36 to rise until the pressure of the force sensor reaches the target value P, and the pressure is maintained constant;

[0056] S4. The handle drives the rotating shaft 20 to rotate, and the in-hole in-situ tester 16 descends into the middle hole of the in-hole test model to test the physical properties.

[0057] Fig.11 The present invention is a schematic diagram of a hole wall test model structure of an apparatus and method for model testing in a rock and soil borehole. As shown in the figure, the hole wall test method includes the following steps:

[0058] S1. Turn the nut to adjust the distance between the pressure plate 3 and the support plate 2 to facilitate the filling of the rock and soil into the model box 14. The jack 13 drives the pressure plate 36 to rise so that the upper surface of the pressure plate 36 is flush with the upper surface of the support plate 2.

[0059] S2, place the second side plate 34 on the open side of the model box 14, fill the model box 14 with rock and soil, then take out the second side plate 34 to form a hole wall test model, put the protrusion 41 of the cover plate 40 into the avoidance hole 15, the cover plate 40 is fixedly connected with the pressure plate 3 by screws, and the nuts are adjusted to make the lower surface of the pressure plate 3 contact with the top surface of the model box 14;

[0060] S3, the jack 13 drives the pressure plate 36 to rise until the pressure of the force sensor reaches the target value P, and the pressure is maintained constant;

[0061] S4. The electric cylinder 9 drives the power sensor 10 and the probe 12 to move at a specific speed to perform a loading test on the hole wall of the hole wall test model.

[0062] Therefore, the present invention adopts the above-mentioned device and method for model testing in rock and soil boreholes, which can solve the problem that existing rock and soil tests cannot simulate actual stress, resulting in large errors in test tests.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A device for model testing in a rock or soil borehole, characterized in that: It includes a bottom plate, a support plate is arranged above the bottom plate, a pressure plate is arranged above one end of the support plate, a mounting plate is arranged above the pressure plate, and the bottom plate, the support plate, the pressure plate and the mounting plate are connected by an adjustment structure; a lifting element is arranged on the bottom plate, a pressure plate is arranged on the top of the lifting element, a force sensor for measuring the lifting force is arranged on the pressure plate, a through hole matched with the pressure plate is arranged on the support plate, a model box is arranged on the support plate, the model box is located directly above the through hole, and the pressure plate is located directly above the model box; a hole wall testing mechanism is arranged on the support plate, the hole wall testing mechanism is located on one side of the model box, an in-hole testing mechanism is arranged on the mounting plate, the in-hole testing mechanism is located directly above the model box, and a avoidance hole 1 is arranged on the pressure plate for the in-hole testing mechanism to pass through; the hole wall testing mechanism and the force sensor are connected to a computer through a data acquisition device, and the computer, the lifting element and the hole wall testing mechanism are connected to a power supply; The model box is a rectangular structure with three closed sides and one open side. The upper top surface and the lower bottom surface of the model box are open. The inside of the model box is provided with a side panel 1 or a side panel 2 for closing the open side. The middle of the side panel 2 is provided with a semi-cylindrical mold concave inwards. The avoidance hole 1 of the pressing plate is provided with a cover plate for closing the avoidance hole, and a convex block matching the avoidance hole 1 is provided on the lower surface of the cover plate, and the lower surface of the convex block is flush with the lower surface of the pressing plate; The in-hole testing mechanism comprises a support, the supports are arranged on the mounting plate relative to each other, a rotating shaft is arranged between the supports, the rotating shaft is rotatably connected with the support, a crank is arranged at one end of the rotating shaft for driving the rotating shaft to rotate, a steel wire rope is wound around the rotating shaft, an in-hole in-situ tester is arranged at the bottom of the steel wire rope, and a second avoidance hole is arranged on the mounting plate for the in-situ tester to pass through; The adjustment structure includes a second screw rod, and the upper and lower surfaces of the bottom plate, the support plate, the pressure plate and the mounting plate are all provided with limited position nuts, and the nuts are sleeved on the second screw rod; The lifting element is a jack; The hole wall testing mechanism includes a reaction seat, which is fixed on the support plate, and the reaction seat is connected to the electric cylinder through a flange seat. A force sensor 1 is threadedly connected to the push rod of the electric cylinder, and the force sensor 1 is connected to the probe through a connecting pipe. The two ends of the connecting pipe are respectively threadedly connected to the force sensor 1 and the probe. An opening is provided on the connecting pipe for the probe line to pass through. The probe, the force sensor 1, and the electric cylinder are all connected to the data collector. The method for using the rock and soil body borehole model test device comprises the following steps: S1. Turn the nut to adjust the distance between the pressure plate and the support plate to facilitate the filling of rock and soil into the model box. The jack drives the pressure plate to rise so that the upper surface of the pressure plate is flush with the upper surface of the support plate. S2. Place the side plate 1 on the open side of the model box, fill the model box with rock and soil, use a drill bit to drill a hole in the middle of the rock and soil to form an in-hole test model, and adjust the nut so that the lower surface of the pressing plate contacts the top surface of the model box; Or place the second side plate on the open side of the model box, fill the model box with rock and soil, then take out the second side plate to form a hole wall test model, put the convex block of the cover plate into the avoidance hole one, fix the cover plate and the pressure plate with screws, and adjust the nuts to make the lower surface of the pressure plate contact with the top surface of the model box; S3, the jack drives the pressure plate to rise until the pressure of the force sensor reaches the target value P, maintaining a constant pressure; S4. The rotating shaft is driven to rotate by the crank, and the in-hole in-situ tester descends into the middle hole of the in-hole test model to perform the test; Or the electric cylinder drives the power sensor and the probe to move at a specific speed to perform a loading test on the hole wall of the hole wall test model.

2. The device for model testing in a rock and soil borehole according to claim 1, characterized in that: The bottom plate, the supporting plate, the pressing plate and the mounting plate are provided with through holes for the second screw to pass through.

3. The device for model testing in a rock and soil borehole according to claim 1, characterized in that: A screw rod 1 is arranged at one end of the bottom plate and one end of the support plate, through holes are arranged on the bottom plate and the support plate for the screw rod 1 to pass through, and limited nuts are arranged on the upper and lower surfaces of the bottom plate and the support plate, and the nuts are sleeved on the screw rod 1.

4. The device for model testing in a rock and soil borehole according to claim 1, characterized in that: The jack is connected to an oil pump through an oil pipe, the oil pump is connected to a control box, and the control box is connected to a power source.

5. The device for model testing in a rock and soil borehole according to claim 1, characterized in that: A mounting box for placing a force sensor is arranged in the middle of the pressure plate, and the side walls of the mounting box are connected to the pressure plate via a plurality of stiffening plates. A notch is arranged on the side walls of the mounting box for the wire of the force sensor to pass through, and the force sensor is connected to a data collector.

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