A test fixture for surrounding rock stability

Abstract

The utility model discloses a kind of surrounding rock stability test clamps, it is related to rock mechanics technical field, including cushion block, the upper portion fixedly connected with fixed plate of cushion block, by screwing bolt one makes slider three and slider four mutually away, and drive the boss of slider three side face inserts the opening in fixed block one inside, the boss of slider four side face inserts the opening in fixed block two inside, so that limiting plate is fixed, realize stress conduction to fixed block two and two fixed block one by limiting plate, compared with bolt fixing, can effectively prevent the error of experimental data caused by stress and further lead to bolt deformation, by slider two inserts fixed plate, slider one inserts fixed plate one, while slider one inserts slider two, when bolt two is too tight and lead to bolt two is difficult to loosen, after slider one is extracted, directly extract bolt two, the pressure exerted on support block two can be unloaded, exerted on support block two more conveniently unloaded pressure is realized.

Description

Technical Field

[0001] This utility model relates to the field of rock mechanics technology, and in particular to a test fixture for surrounding rock stability. Background Technology

[0002] After the excavation of underground tunnels, the stability of the surrounding rock is one of the most important issues. It is directly related to the safety of workers and equipment, construction efficiency, support costs, and many other aspects. The surrounding rock stability test fixture is a special device used to simulate the stress state of the surrounding rock in underground tunnels. It is mainly used in rock mechanics tests and rockburst disaster research. Its core function is to simulate the stress of rock samples under uniaxial or multiaxial compression conditions through mechanical structure.

[0003] A search revealed that CN113588412B discloses a rock stability test fixture and test method. By setting the pad block and the pressure block opposite to each other, and connecting the support part between the pad block and the pressure block, the support part, the pad block and the pressure block can form a semi-enclosed clamping space. The rock sample can be clamped in the clamping space. The uniaxial loading test machine can apply a normal load to the rock sample through the pressure block. At this time, the support part can apply a unilateral lateral constraint force to the rock sample, thereby achieving the purpose of providing unilateral confining pressure loading to the rock sample using the uniaxial loading test machine.

[0004] However, the device still has some shortcomings in use. When simulating the surrounding rock stability test, after clamping the rock sample, the stress will be concentrated on the multiple bolts that fix the first and second limiting plates to the sides of the pressure block and pad block. After multiple surrounding rock stability tests, the bolts may deform, which will lead to errors in the test data. At the same time, after the limiting part applies normal loading to the rock sample by the support block, the bolts of the limiting part may be tightened too much, making it difficult to loosen the bolts of the limiting part when unloading the normal loading. Therefore, a surrounding rock stability test fixture is proposed. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies where, when simulating surrounding rock stability tests, stress is concentrated on multiple bolts fixing the first and second limiting plates to the pressure block and pad after clamping the rock sample. After multiple surrounding rock stability tests, the bolts may deform, leading to errors in the test data. Additionally, after the limiting part applies normal loading to the rock sample, the bolts in the limiting part may be tightened too much, making it difficult to loosen them when unloading the normal loading. Therefore, this invention proposes a surrounding rock stability test fixture.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A rock stability test fixture includes a pad block, a fixing plate fixedly connected to the upper part of the pad block, chains symmetrically fixedly connected to the upper part of the fixing plate, pressure blocks fixedly connected to the end faces of the two chains, a slider two slidably connected inside the fixing plate, a slider one slidably connected inside the fixing plate, a bolt two threadedly connected inside the slider two, bolt one symmetrically rotatably connected inside both the pad block and the pressure block, a slider three symmetrically slidably connected inside both the pad block and the pressure block, a slider four symmetrically slidably connected inside both the pad block and the pressure block, a limiting plate movably connected to the side of each of the pad block and the pressure block, a fixing block one symmetrically fixedly connected to the side of each limiting plate, and a fixing block two fixedly connected to the side of each limiting plate. The limiting plates are fixed by inserting the protrusions on the sides of slider three and slider four into the openings inside the fixing blocks one and two.

[0007] The above technical solution further includes: The upper part of the pressure block is provided with a support block one, and the inside of the opening formed by the pad block and the pressure block is provided with a support block two. The rock sample is placed inside the opening formed by the pad block and the pressure block, so that the rock sample is clamped in the clamping space, with one side exposed and the other sides being wrapped.

[0008] The second slider is slidably connected to the first slider. The size of the opening inside the second slider is adapted to the size of the protrusions on both sides of the first slider. The second slider is fixed by inserting the first slider into the second slider.

[0009] Slider three and slider four are both threadedly connected to bolt one. Bolt one has a bidirectional thread. Tightening bolt one will cause slider three and slider four to move away from each other or move closer to each other at the same time.

[0010] The interior of both the pad and the pressure block is slidably connected to two fixed blocks, and the interior of both the pad and the pressure block is slidably connected to two fixed blocks, so that the limiting plate is slidably connected to the pad and the pressure block respectively through the two fixed blocks.

[0011] The size of the protrusions on the four sides of the two sliders is adapted to the size of the two symmetrical openings inside the fixing block two, so that the protrusions on the four sides of the sliders can be inserted into the openings inside the fixing block two.

[0012] The sizes of the protrusions on the three sides of the two sliders are respectively adapted to the sizes of the openings opened inside the two fixing blocks, so that the protrusions on the three sides of the sliders can be inserted into the openings opened inside the fixing blocks.

[0013] This utility model has the following beneficial effects: In this invention, by tightening bolt one, slider three and slider four are moved away from each other, and the protrusion on the side of slider three is inserted into the opening inside the fixing block one, and the protrusion on the side of slider four is inserted into the opening inside the fixing block two, so that the limiting plate is fixed. This allows stress to be transmitted to fixing block two and the two fixing blocks one through the limiting plate. Compared with bolt fixing, this can effectively prevent the bolt from deforming due to stress, thus preventing errors in experimental data.

[0014] In this utility model, by inserting slider two into the fixed plate and slider one into the fixed plate one at the same time, slider one is inserted into slider two. When bolt two is tightened too much and it is difficult to loosen bolt two, after removing slider one, bolt two can be directly removed to unload the pressure applied to support block two, thus achieving a more convenient unloading of the pressure applied to support block two. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a rock stability test fixture proposed in this utility model; Figure 2 This is a schematic diagram of the second sectional view of the nozzle side in this utility model; Figure 3 This is a schematic cross-sectional view of the top of the nozzle in this utility model; Figure 4 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 for Figure 1 Enlarged schematic diagram of the structure at point B; Figure 6 for Figure 3 Enlarged schematic diagram of the structure at point C.

[0016] In the diagram: 1. Pad; 2. Fixing plate; 3. Chain; 4. Pressure block; 5. Support block one; 6. Bolt one; 7. Limiting plate; 8. Slider one; 9. Slider two; 10. Bolt two; 11. Slider three; 12. Slider four; 13. Fixing block one; 14. Fixing block two; 15. Support block two; 16. Rock sample. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 - Figure 6As shown, the present invention proposes a rock stability test fixture, comprising a pad 1, a fixing plate 2 fixedly connected to the upper part of the pad 1, chains 3 symmetrically fixedly connected to the upper part of the fixing plate 2, pressure blocks 4 fixedly connected to the end faces of the two chains 3, slider 2 9 slidably connected inside the fixing plate 2, slider 1 8 slidably connected inside the fixing plate 2, bolt 2 10 threadedly connected inside slider 2 9, bolt 1 6 symmetrically rotatably connected inside the pad 1 and pressure blocks 4, slider 3 11 symmetrically slidably connected inside the pad 1 and pressure blocks 4, slider 4 12 symmetrically slidably connected inside the pad 1 and pressure blocks 4, limiting plates 7 movably connected to the sides of the pad 1 and pressure blocks 4, fixing blocks 1 13 symmetrically fixedly connected to the sides of the limiting plates 7, and fixing blocks 2 14 fixedly connected to the sides of the limiting plates 7.

[0019] A support block 1 5 is provided on the upper part of the pressure block 4, a support block 2 15 is provided inside the opening formed by the pad block 1 and the pressure block 4, and a rock sample 16 is provided inside the opening formed by the pad block 1 and the pressure block 4.

[0020] Slider 2 9 is slidably connected to slider 1 8, and the size of the opening inside slider 2 9 is adapted to the size of the protrusions on both sides of slider 1 8.

[0021] Slider 3 11 and slider 4 12 are connected to bolt 1 6 by thread. Bolt 1 6 has a bidirectional thread.

[0022] The interior of pad 1 and pressure block 4 are slidably connected to two fixed blocks 13, and the interior of pad 1 and pressure block 4 are slidably connected to fixed blocks 14.

[0023] The size of the protrusions on the sides of the two sliders 12 is matched with the size of the two symmetrical openings inside the fixing block 14.

[0024] The size of the protrusions on the sides of the two sliders 3 11 is adapted to the size of the openings inside the two fixed blocks 13.

[0025] In this embodiment, after placing the rock sample 16 and support block 2 15 above the pad 1, the pressure block 4 is placed above the rock sample 16 and support block 2 15. Then, two limiting plates 7 are inserted into the pad 1 and pressure block 4 respectively. After the two limiting plates 7 are in contact with the pad 1 and pressure block 4 respectively, the bolts 1 6 on both sides of the pad 1 and pressure block 4 are tightened simultaneously. Since the thread of bolt 1 6 is a bidirectional thread, tightening bolt 1 6 causes it to rotate, which in turn causes slider 3 11 and slider 4 12 to move away from each other. The movement of slider 11 causes the protrusion on its side to move, and the movement of slider 412 causes the protrusion on its side to move. The mutual distancing of sliders 11 and 412 causes the protrusion on the side of slider 11 to insert into the opening inside the fixing block 13, while the protrusion on the side of slider 412 inserts into the opening inside the fixing block 214. Then, tightening bolt 6 causes slider 11 to press tightly against fixing block 13, and simultaneously causes slider 412 to press tightly against fixing block 214. At this point, the two limiting plates 7 on the sides of pad 1 and pressure block 4 are fixed. Then, tightening bolt 2... 10. Bolt 2 10 pushes support block 2 15, causing support block 2 15 to push rock sample 16 towards the limiting plate 7. Continuously tightening bolt 2 10 causes rock sample 16 to press tightly against the two limiting plates 7. At this time, rock sample 16 is fixed in the C-shaped opening formed by pad 1, support block 2 15, and pressure block 4. The pressure applied to rock sample 16 is transmitted to the limiting plate 7, and then from the limiting plate 7 to the two fixing blocks 1 13 and 2 14 on the side of the limiting plate 7, thus achieving pressure distribution and preventing pressure loss due to limiting. The test error caused by the deformation of plate 7 is addressed by continuously applying pressure to support block 5 during the test until rock sample 16 is split and destroyed. The test data is then recorded. Due to the tightening of bolt 2 10, it is difficult to loosen bolt 2 10. At this time, slider 1 8 can be pulled out until the two protrusions at the bottom of slider 1 8 leave the opening inside slider 2 9. Then, bolt 2 10 is pulled out to move slider 2 9 away from the opening inside the fixing plate 2. Since support block 2 15 is no longer under the pressure of bolt 2 10, rock sample 16 can be replaced.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rock stability test fixture, comprising a pad (1), characterized in that, The upper part of the pad (1) is fixedly connected to a fixing plate (2), and the upper part of the fixing plate (2) is symmetrically fixedly connected to a chain (3). The end faces of the two chains (3) are fixedly connected to a pressure block (4). The inside of the fixing plate (2) is slidably connected to a slider two (9). The inside of the fixing plate (2) is slidably connected to a slider one (8). The inside of the slider two (9) is threadedly connected to a bolt two (10). The inside of the pad (1) and the pressure block (4) are symmetrically rotated and connected to a bolt one (6). The inside of the pad (1) and the pressure block (4) are symmetrically slidably connected to a slider three (11). The inside of the pad (1) and the pressure block (4) are symmetrically slidably connected to a slider four (12). The sides of the pad (1) and the pressure block (4) are movably connected to a limit plate (7). The side of the limit plate (7) is symmetrically fixedly connected to a fixing block one (13). The side of the limit plate (7) is fixedly connected to a fixing block two (14).

2. The rock stability test fixture according to claim 1, characterized in that, The upper part of the pressure block (4) is provided with a support block one (5), the inside of the opening formed by the pad block (1) and the pressure block (4) is provided with a support block two (15), and the inside of the opening formed by the pad block (1) and the pressure block (4) is provided with a rock sample (16).

3. The rock stability test fixture according to claim 1, characterized in that, The second slider (9) is slidably connected to the first slider (8), and the size of the opening inside the second slider (9) is adapted to the size of the protrusions on both sides of the first slider (8).

4. The rock stability test fixture according to claim 1, characterized in that, The slider three (11) and slider four (12) are threaded together with the bolt one (6), and the thread of the bolt one (6) is a bidirectional thread.

5. A rock stability test fixture according to claim 1, characterized in that, The interior of the pad (1) and the pressure block (4) are slidably connected to two fixing blocks (13), and the interior of the pad (1) and the pressure block (4) are slidably connected to two fixing blocks (14).

6. A rock stability test fixture according to claim 1, characterized in that, The size of the protrusions on the sides of the two sliders (12) is matched with the size of the two openings symmetrically opened inside the fixing block (14).

7. A rock stability test fixture according to claim 1, characterized in that, The size of the protrusions on the sides of the two sliders (11) is adapted to the size of the openings inside the two fixing blocks (13).

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