Model test device for simulating diffusion rule of single-fracture grouting slurry

Abstract

The invention discloses a model test device for simulating a diffusion rule of single-fracture grouting slurry, a lower boundary pressure plate and an upper boundary pressure plate are sequentially mounted in a flat plate placement groove in a sliding fit manner, and the lower boundary pressure plate is attached to the bottom wall of the flat plate placement groove; the flat plate placement groove is connected with a fixed frame, the gap adjusting assembly is movably connected with the fixed frame, an elastic part is arranged between the gap adjusting assembly and the fixed frame, the gap adjusting assembly is pressed on the surface of the upper boundary pressing plate, and a crack simulation space is formed between the upper boundary pressing plate and the lower boundary pressing plate. According to the invention, the gap adjusting assembly is arranged, so that the gap between the upper boundary pressing plate and the lower boundary pressing plate can be adjusted, and simulation tests can be carried out aiming at fractures with different sizes; by arranging the adjusting bolt and the adjusting nut, the upper boundary pressing plate can push the adjusting bolt to slide on the mounting plate to a certain extent under the action of grouting pressure during a test, so that the condition that the crack can change is simulated.

Description

Technical Field

[0001] The invention relates to the technical field of grouting simulation test, in particular to a model test device for simulating the diffusion law of grouting slurry in a single crack. Background Art

[0002] The grouting method is to inject solidifiable materials into the rock and soil layer through high-pressure grouting. After the slurry solidifies, it has the effect of reinforcing the stratum and sealing groundwater. However, during the actual underground grouting construction, the grouting range is poorly controllable, and the grouting effect and range cannot be directly judged. Therefore, it is necessary to carry out simulation tests on the ground under different conditions to explore the diffusion law of slurry in cracks under various conditions.

[0003] When grouting into the cracks, the actual parameters of the cracks are different, and the diffusion law of the slurry in different cracks will also be different. There are roughly two types of crack simulation devices in the prior art: 1. The relative positions of the upper and lower boundary plates used to simulate the cracks are fixed, and the relative positions of the upper and lower boundary plates will not change during the grouting process; 2. After the upper and lower boundary plates are adjusted, at least one boundary plate can be movable during the grouting process, and the movable boundary plate generally provides the initial support force through a spring. During actual grouting, the rock walls on both sides of the crack cannot be fixed, so the first device has certain limitations in the simulation effect and cannot simulate the changes in the cracks during the grouting process; the second device uses a spring to directly provide the initial support force, and this initial support force will not change synchronously with the changes in the simulated cracks. In other words, no matter how large the initial crack is set, the initial support force provided is the same, which is somewhat different from the actual situation. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a model test device for simulating the diffusion law of grouting slurry in a single fracture, which can improve the simulation authenticity.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a model test device for simulating the diffusion law of grouting slurry in a single crack, comprising a flat plate mounting groove, a gap adjustment component, an upper boundary pressure plate and a lower boundary pressure plate, the lower boundary pressure plate and the upper boundary pressure plate are slidingly fitted in the flat plate mounting groove in sequence, and the lower boundary pressure plate is attached to the bottom wall of the flat plate mounting groove; a fixed frame is connected to the flat plate mounting groove, the gap adjustment component is movably connected to the fixed frame, an elastic component is arranged between the gap adjustment component and the fixed frame, the gap adjustment component is pressed on the surface of the upper boundary pressure plate, and a crack simulation space is formed between the upper boundary pressure plate and the lower boundary pressure plate; a grouting hole is opened on the lower boundary pressure plate, and the grouting hole is fluid-conductive with the crack simulation space.

[0006] The above-mentioned model test device for simulating the diffusion law of single-crack grouting slurry, the fixed frame is fixedly mounted with a mounting plate parallel to the upper boundary pressure plate, the gap adjustment assembly includes a bearing plate and an adjusting bolt, the elastic component is fixedly mounted in the middle of the bearing plate, the free end of the elastic component is abutted against the mounting plate, the bearing plate is fixedly connected with the adjusting bolts on both sides of the elastic component, the adjusting bolts penetrate the mounting plate and are threadedly connected with adjusting nuts, the adjusting nuts are pressed on the mounting plate, and the adjusting nuts and the elastic component are respectively affixed to the opposite side walls of the mounting plate.

[0007] The above-mentioned model test device for simulating the diffusion law of single-crack grouting slurry, the elastic component includes a spring seat, a compression spring and a pressure sensor, the spring seat is fixedly mounted on the bearing plate, one end of the compression spring is mounted on the spring seat, and the other end of the compression spring is pressed against the pressure sensor, and the compression spring presses the pressure sensor against the mounting plate.

[0008] The above-mentioned model test device for simulating the diffusion law of single-crack grouting slurry has a main rod fixedly connected vertically on the bearing plate toward the direction of the upper boundary pressure plate, and force component supports are installed at equal intervals around the main rod, and the force component supports are attached to the surface of the upper boundary pressure plate.

[0009] The above-mentioned model test device for simulating the diffusion law of single-crack grouting slurry, the fixed frame includes two L-shaped frames and a rectangular frame, the ends of the two L-shaped frames are respectively vertically fixedly connected to the two ends of the rectangular frame, the other end of the L-shaped frame extends to the bottom of the flat plate mounting groove and fits with the bottom wall of the flat plate mounting groove, and the rectangular frame is arranged above the upper boundary pressure plate and parallel to the upper boundary pressure plate.

[0010] In the above-mentioned model test device for simulating the diffusion law of grouting slurry in a single crack, connecting bolts are installed on the side walls of the L-shaped frame, and the L-shaped frame is rotatably connected to the bracket through the connecting bolts.

[0011] The above-mentioned model test device for simulating the diffusion law of single-crack grouting slurry, the flat plate placement groove includes a base plate and an external frame, the middle of the base plate is provided with an opening, the external frame is vertically fixedly installed on the edge position of the base plate, and the external frame is provided with a measurement window along its height direction; the lower boundary pressure plate is attached to the surface of the base plate, and the edges of the lower boundary pressure plate and the upper boundary pressure plate are respectively slidably and sealedly attached to the inner wall surface of the external frame.

[0012] In the above-mentioned model test device for simulating the diffusion law of grouting slurry in a single fracture, a water inlet hole, a pressure stabilizing hole and a pressure measuring hole are provided on the upper boundary pressure plate.

[0013] In the above-mentioned model test device for simulating the diffusion law of grouting slurry in a single crack, the grouting hole opened on the lower boundary pressure plate is located in the middle position of the lower boundary pressure plate.

[0014] The technical solution of the present invention achieves the following beneficial technical effects:

[0015] The present invention, by providing a gap adjustment component, can adjust the gap between the upper boundary pressure plate and the lower boundary pressure plate, and can carry out simulation tests on cracks of different sizes; by providing an adjusting bolt and an adjusting nut, when carrying out the test, under the action of the grouting pressure, the upper boundary pressure plate can push the adjusting bolt to slide on the mounting plate to a certain extent, thereby simulating the situation that the crack can change; further, since a compression spring is provided between the mounting plate and the bearing plate, when the gap between the upper boundary pressure plate and the lower boundary pressure plate is controlled by turning the adjusting nut, the compression degree of the compression spring is synchronously adjusted, that is, the initial pressure of the upper boundary pressure plate is adjusted, so that the simulation of cracks of different sizes can be achieved while the initial pressure provided can be automatically and synchronously adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 A schematic diagram of a side cross-sectional structure of the present invention;

[0018] Figure 3 A schematic structural diagram of a gap adjustment assembly of the present invention;

[0019] Figure 4 A schematic structural diagram of a fixed frame of the present invention;

[0020] Figure 5 A schematic structural diagram of a flat plate placement slot of the present invention;

[0021] Figure 6 A schematic structural diagram of the upper boundary pressure plate of the present invention;

[0022] Figure 7 A schematic structural diagram of the lower boundary pressure plate of the present invention.

[0023] The reference numerals in the figure are as follows: 1-bracket; 2-connecting bolt; 3-fixed frame; 31-L-shaped frame; 32-rectangular frame; 33-mounting plate; 4-flat plate mounting groove; 41-base plate; 42-external frame; 5-gap adjustment assembly; 51-bearing plate; 52-spring seat; 53-compression spring; 54-pressure sensor; 55-adjusting bolt; 56-adjusting nut; 57-main rod; 58-force distribution bracket; 6-upper boundary pressure plate; 7-measuring window; 8-lower boundary pressure plate; 9-grouting hole; 10-water inlet hole; 11-pressure stabilizing hole; 12-pressure measuring hole. DETAILED DESCRIPTION

[0024] A model test device for simulating the diffusion law of grouting slurry in a single fracture in this embodiment is as follows: Figure 1-2 As shown, it includes a flat plate mounting groove 4, a gap adjustment component 5, an upper boundary pressure plate 6 and a lower boundary pressure plate 8, the lower boundary pressure plate 8 and the upper boundary pressure plate 6 are slidably fitted in the flat plate mounting groove 4 in sequence, and the lower boundary pressure plate 8 is attached to the bottom wall of the flat plate mounting groove 4; the flat plate mounting groove 4 is connected with a fixed frame 3, the gap adjustment component 5 is movably connected with the fixed frame 3, an elastic component is arranged between the gap adjustment component 5 and the fixed frame 3, the gap adjustment component 5 is pressed on the surface of the upper boundary pressure plate 6, and a crack simulation space is formed between the upper boundary pressure plate 6 and the lower boundary pressure plate 8; a grouting hole 9 is opened on the lower boundary pressure plate 8, the grouting hole 9 is located in the middle position of the lower boundary pressure plate 8, the grouting hole 9 is in fluid communication with the crack simulation space, and a water inlet hole 10, a pressure stabilizing hole 11 and a pressure measuring hole 12 are opened on the upper boundary pressure plate 6.

[0025] like Figure 5 As shown, the flat plate placement slot 4 includes a base plate 41 and an outer frame 42, the base plate 41 has an opening in the middle, the outer frame 42 is vertically fixedly installed on the edge of the base plate 41, and the outer frame 42 has a measuring window 7 along its height direction; the lower boundary pressure plate 8 is attached to the surface of the base plate 41, and the edges of the lower boundary pressure plate 8 and the upper boundary pressure plate 6 are respectively slidably sealed with the inner wall surface of the outer frame 42. By providing the base plate 41 with an opening, the middle position of the lower boundary pressure plate 8 has a certain free space, and during pulse grouting, the middle position of the lower boundary pressure plate 8 can vibrate slightly synchronously with the pulse, which is more in line with the actual grouting construction.

[0026] like Figure 4As shown, the fixed frame 3 includes two L-shaped frames 31 and a rectangular frame 32. The ends of the two L-shaped frames 31 are respectively and vertically fixedly connected to the two ends of the rectangular frame 32. The other end of the L-shaped frame 31 extends to the bottom of the flat plate placement groove 4 and fits with the bottom wall of the flat plate placement groove 4. The rectangular frame 32 is arranged above the upper boundary pressure plate 6 and is arranged parallel to the upper boundary pressure plate 6. A mounting plate 33 is fixedly connected to the middle position of the rectangular frame 32. A connecting bolt 2 is installed on the side wall of the L-shaped frame 31. The L-shaped frame 31 is rotatably connected to the bracket 1 through the connecting bolt 2. By loosening the connecting bolt 2, the angle of the fixed frame 3 relative to the bracket 1 can be adjusted, thereby adjusting the angle of the crack simulation space. By setting the fixed frame 3, quick disassembly and assembly can be achieved.

[0027] like Figure 2-3 As shown, the mounting plate 33 on the fixed frame 3 is parallel to the upper boundary pressure plate 6, the gap adjustment assembly 5 includes a bearing plate 51 and an adjusting bolt 55, the elastic component is fixedly mounted in the middle of the bearing plate 51, the free end of the elastic component is abutted against the mounting plate 33, the bearing plate 51 is fixedly connected with the adjusting bolts 55 on both sides of the elastic component, the adjusting bolts 55 penetrate the mounting plate 33 and are threadedly connected with adjusting nuts 56, the adjusting nuts 56 are pressed on the mounting plate 33, and the adjusting nuts 56 and the elastic component are respectively affixed to the opposite side walls of the mounting plate 33, a main rod 57 is vertically fixedly connected to the bearing plate 51 in the direction of the upper boundary pressure plate 6, force component brackets 58 are evenly spaced around the main rod 57, and the force component brackets 58 are affixed to the surface of the upper boundary pressure plate 6.

[0028] like Figure 3 As shown, the elastic component includes a spring seat 52, a compression spring 53 and a pressure sensor 54. The spring seat 52 is fixedly mounted on the supporting plate 51, one end of the compression spring 53 is mounted on the spring seat 52, and the other end of the compression spring 53 is pressed against the pressure sensor 54. The compression spring 53 presses the pressure sensor 54 against the mounting plate 33.

[0029] When in use, it is necessary to adjust the inclination angle of the plate placement groove 4, and then tighten the connecting bolts 2. Figure 2-3As shown, then by screwing the adjusting nut 56, the initial distance between the bearing plate 51 and the mounting plate 33 is adjusted, so as to adjust the gap between the upper boundary pressure plate 6 and the lower boundary pressure plate 8. During the adjustment, the compression spring 53 will be squeezed to different degrees to change the initial pressure value. Specifically, the smaller the gap between the upper boundary pressure plate 6 and the lower boundary pressure plate 8, the smaller the compression degree of the compression spring 53, and the smaller the initial pressure value provided. Of course, springs with different elastic coefficients can also be set as needed. During grouting, the grouting pipe is connected to the grouting hole 9, and corresponding monitoring and testing equipment are connected to each hole position of the upper boundary pressure plate 6. After the slurry enters between the upper boundary pressure plate 6 and the lower boundary pressure plate 8, the pressure is applied to the upper boundary pressure plate 6 and the lower boundary pressure plate 8. After the upper boundary pressure plate 6 is subjected to a pressure greater than the elastic force of the compression spring 53, the upper boundary pressure plate 6 moves upward.

[0030] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A model test device for simulating the diffusion law of single fracture grouting slurry, characterized in that: The invention comprises a plate mounting groove (4), a gap adjustment component (5), an upper boundary pressure plate (6) and a lower boundary pressure plate (8); the lower boundary pressure plate (8) and the upper boundary pressure plate (6) are slidably fitted in the plate mounting groove (4) in sequence, and the lower boundary pressure plate (8) is fitted on the bottom wall of the plate mounting groove (4); a fixed frame (3) is connected to the plate mounting groove (4); the gap adjustment component (5) is movably connected to the fixed frame (3); an elastic component is arranged between the gap adjustment component (5) and the fixed frame (3); the gap adjustment component (5) is pressed on the surface of the upper boundary pressure plate (6); a crack simulation space is formed between the upper boundary pressure plate (6) and the lower boundary pressure plate (8); a grouting hole (9) is opened on the lower boundary pressure plate (8), and the grouting hole (9) is fluid-conductive with the crack simulation space.

2. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 1, characterized in that: A mounting plate (33) parallel to the upper boundary pressure plate (6) is fixedly mounted on the fixed frame (3); the gap adjustment assembly (5) comprises a bearing plate (51) and an adjusting bolt (55); the elastic component is fixedly mounted in the middle of the bearing plate (51); the free end of the elastic component abuts against the mounting plate (33); the adjusting bolts (55) are fixedly connected on both sides of the elastic component on the bearing plate (51); the adjusting bolts (55) penetrate the mounting plate (33) and are threadedly connected with an adjusting nut (56); the adjusting nut (56) is pressed against the mounting plate (33); and the adjusting nut (56) and the elastic component are respectively attached to opposite side walls of the mounting plate (33).

3. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 2, characterized in that: The elastic component comprises a spring seat (52), a compression spring (53) and a pressure sensor (54); the spring seat (52) is fixedly mounted on the bearing plate (51); one end of the compression spring (53) is mounted on the spring seat (52); the other end of the compression spring (53) is pressed against the pressure sensor (54); the compression spring (53) presses the pressure sensor (54) against the mounting plate (33).

4. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 2, characterized in that: A main rod (57) is vertically fixedly connected to the bearing plate (51) in the direction of the upper boundary pressure plate (6), and force component brackets (58) are installed at equal intervals around the main rod (57), and the force component brackets (58) are attached to the surface of the upper boundary pressure plate (6).

5. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 1, characterized in that: The fixed frame (3) comprises two L-shaped frames (31) and a rectangular frame (32), the ends of the two L-shaped frames (31) are respectively vertically fixedly connected to the two ends of the rectangular frame (32), the other end of the L-shaped frame (31) extends to the bottom of the flat plate placement groove (4) and fits with the bottom wall of the flat plate placement groove (4), and the rectangular frame (32) is arranged above the upper boundary pressure plate (6) and is arranged parallel to the upper boundary pressure plate (6).

6. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 5, characterized in that: A connecting bolt (2) is installed on the side wall of the L-shaped frame (31), and the L-shaped frame (31) is rotatably connected to the bracket (1) via the connecting bolt (2).

7. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 1, characterized in that: The flat plate placement groove (4) comprises a base plate (41) and an outer frame (42); an opening is provided in the middle of the base plate (41); the outer frame (42) is vertically fixedly installed on the edge of the base plate (41); a measuring window (7) is provided on the outer frame (42) along its height direction; the lower boundary pressure plate (8) is attached to the surface of the base plate (41); the edges of the lower boundary pressure plate (8) and the upper boundary pressure plate (6) are respectively slidably and sealingly attached to the inner wall surface of the outer frame (42).

8. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 1, characterized in that: The upper boundary pressure plate (6) is provided with a water inlet hole (10), a pressure stabilizing hole (11) and a pressure measuring hole (12).

9. A model test device for simulating the diffusion law of single fracture grouting slurry according to claim 1, characterized in that: The grouting hole (9) provided on the lower boundary pressure plate (8) is located in the middle of the lower boundary pressure plate (8).

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