Compression-shear test device for fractured rock mass

Abstract

The utility model relates to a compression-shear test device for fractured rock mass, which comprises a detection assembly, the detection assembly comprises a detection table, a straight shear block is slidably connected to the upper side wall of the detection table, a driving rod is fixedly connected to the straight shear block, an abutting block is fixedly connected to the upper side wall of the detection table, and a rock sample located between the abutting block and the straight shear block is placed on the detection table. According to the device, when a rock sample is damaged, the magnetic plate can move along with the rock sample, the accuracy of the shear strength detection of the rock sample is improved, the device is different from a traditional rock sample downward pressing mode, a traditional pressure shaft does not move due to the fact that the traditional pressure shaft does not move, and the detection precision is improved. Meanwhile, through the arrangement of the transverse sliding assembly, the friction of transverse movement between the rock sample and the magnetic plate is avoided, and the accuracy of the shear strength detection of the rock sample is further improved.

Description

Technical Field

[0001] The utility model relates to a compression shear test device, in particular to a compression shear test device for fractured rock mass, which is applied in the technical field of direct shear instruments. Background Art

[0002] The compression and shear test of fractured rock mass is used to study the mechanical properties of rock fractures under pressure and shear force. In the test, pressure perpendicular to the fracture surface and shear force parallel to the fracture surface are usually applied to simulate the actual stress conditions of rock fractures. The compression and shear test of fractured rock mass can obtain the strength parameters of fractured rock mass, such as compressive strength, shear strength, etc. These parameters are of great significance for rock mass stability evaluation and rock engineering design in the engineering field.

[0003] Chinese utility model patent CN215640599U discloses an electro-hydraulic servo rock compression and shear testing machine, including a bottom box, the top of which is fixedly connected to a horizontal plate, and the top of which is fixedly connected to a mounting frame. The utility model can replace compression aids of different specifications on the mounting frame for different rock samples, apply loads in the vertical direction through the longitudinal cylinder, and apply compression and shear loads through the transverse cylinder. The transverse cylinder and the longitudinal cylinder have the characteristics of simple structure, small size, and good performance, can reliably and accurately control force and position, and feedback with the sensor in the mounting frame to the matching control computer to form a closed-loop system, thereby improving the working efficiency of the fractured rock specimen experiment and avoiding the problem of inaccurate experimental results due to insufficient conditions during the existing fractured rock specimen experiment.

[0004] Most of the existing compression shear test devices for fractured rock masses use direct shear instruments, which can quickly and effectively detect the shear and compressive strength of rocks. However, during the compression shear test on rock samples, it is necessary to give the rock a downward pressure. The existing method requires a pressure shaft to apply pressure to the rock sample, but before the rock sample is destroyed, there will be friction between the rock sample and the pressure shaft, which leads to the inaccurate detection of the shear strength of the rock sample. In order to improve the accuracy of the shear strength detection of rock samples, the applicant proposes a compression shear test device for fractured rock masses. Utility Model Content

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the utility model is that before the rock sample is destroyed, there is friction between the rock sample and the pressure shaft, which leads to the inaccurate detection of the shear strength of the rock sample.

[0006] In order to solve the above problems, the utility model provides a compression-shear test device for fractured rock mass, including a detection component, the detection component including a detection platform, a side wall of the detection platform is slidably connected with a straight shear block, the straight shear block is fixedly connected with a driving rod, the side wall of the detection platform is fixedly connected with a resist block, a rock sample is placed on the detection platform between the resist block and the straight shear block, a downward pressure component is installed on the side wall of the detection platform, the downward pressure component includes two fixed plates, a mounting frame is fixedly connected between the two fixed plates and the detection platform, a horizontal sliding component is installed between the two fixed plates, a vertical sliding component is slidably connected to the horizontal sliding component, and a reset component located directly above the vertical sliding component is slidably connected to the side wall opposite to the fixed plate.

[0007] As a further improvement of the present application, the transverse sliding assembly includes two sliding bars fixed between two fixed plates, and the front and rear side walls of the vertical sliding assembly are both rotatably connected to two pulleys, and the two pulleys are rollingly connected to the sliding bars.

[0008] As a further improvement of the present application, the vertical sliding assembly includes a lower pressing block rotatably connected to the pulley, two groups of adjustment plates are inserted on the lower pressing block, and the lower end of each group of adjustment plates is fixedly connected to a limiting plate.

[0009] As a further improvement of the present application, the upper ends of the two groups of adjustment plates are fixedly connected to the same horizontal plate, the upper side wall of the lower pressure block is rotatably connected to a screw rod, and the screw rod is threadedly connected to the horizontal plate.

[0010] As another improvement of the present application, a connecting plate is provided between the two groups of limit plates, two rollers are fixedly connected to the left and right side walls of the connecting plate, the lower ends of the two rollers are fixedly connected to the same magnetic plate, an electromagnet is fixedly connected between the two groups of adjustment plates, and the electromagnet and the magnetic plate magnetically repel each other.

[0011] As another improved supplement of the present application, the reset assembly includes two sliding sheets respectively connected in a sliding manner to opposite side walls of the two fixed plates, and a reset frame is fixedly connected between the two sliding sheets.

[0012] As another improved supplement of the present application, magnet plates are fixedly connected to the upper ends of the two fixed plates, and the magnet plates are magnetically attracted to the sliding plates.

[0013] In summary, when the rock sample is damaged, the magnetic plate will move with the rock sample, thereby improving the accuracy of the shear strength test of the rock sample. This is different from the traditional method of pressing down on the rock sample. Since the traditional pressure shaft does not move by itself, the damaged rock sample will produce friction with the pressure shaft at this time, thereby affecting the experimental results. At the same time, through the setting of the lateral sliding component, the friction caused by lateral movement between the rock sample and the magnetic plate can be avoided, further improving the accuracy of the shear strength test of the rock sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional image of the present application;

[0015] Figure 2 This is a schematic diagram of the structure of the vertical sliding component part of the present application;

[0016] Figure 3 An exploded view of this application;

[0017] Figure 4 The state diagram of the rock sample when it was destroyed for this application;

[0018] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0019] Figure 6 This is the state diagram of the reset box when it moves down for this application.

[0020] Description of the numbers in the figure:

[0021] 1. Testing assembly; 101. Testing platform; 102. Straight shear block; 103. Driving rod; 104. Abutment block; 105. Rock sample;

[0022] 2. Pressing assembly; 201. Fixing plate; 202. Mounting frame;

[0023] 3. Horizontal sliding assembly; 301. Sliding bar; 302. Pulley;

[0024] 4. Vertical sliding assembly; 401. Lower pressing block; 402. Adjusting plate; 403. Limiting plate; 404. Horizontal plate; 405. Screw rod; 406. Connecting plate; 407. Roller; 408. Magnetic plate; 409. Electromagnet;

[0025] 5. Reset assembly; 501. Sliding sheet; 502. Reset frame; 503. Magnet plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] The "front, back, left, right" viewing angles of this device are Figure 2 The directions in the attached drawings are taken as reference.

[0028] like Figures 1 to 5As shown, the utility model provides a compression shear test device for fractured rock mass, including a detection component 1, the detection component 1 includes a detection table 101, the upper side wall of the detection table 101 is slidably connected to a straight shear block 102 through a slide rail, which is not shown in the figure, and a driving rod 103 is fixedly connected to the straight shear block 102 by bolts, and the driving rod 103 is connected to a hydraulic mechanism, the structure and principle of the hydraulic mechanism are both prior art, and are used to subject a rock sample 105 to force to detect the shear strength of the rock sample 105, which is not shown in the figure, and a stop block 104 is welded and fixedly connected to the upper side wall of the detection table 101, and a rock between the stop block 104 and the straight shear block 102 is placed on the detection table 101 Sample 105, rock sample 105 is obtained by field sampling. In order to meet the test requirements, rock sample 105 needs to be cut into a rectangular parallelepiped. A downward pressure component 2 is installed on the upper side wall of the test bench 101. The downward pressure component 2 is used to apply a downward pressure to the rock sample 105. The downward pressure component 2 includes two fixed plates 201. A mounting frame 202 is welded and fixedly connected between the two fixed plates 201 and the test bench 101. A horizontal sliding component 3 is installed between the two fixed plates 201. The horizontal sliding component 3 is slidably connected to a vertical sliding component 4 through the cooperation of a sliding bar 301 and a pulley 302. A reset component 5 located directly above the vertical sliding component 4 is slidably connected to the opposite side wall of the fixed plate 201.

[0029] The horizontal sliding component 3 includes two parallel sliding bars 301 welded between two fixed plates 201. The front and rear side walls of the vertical sliding component 4 are rotatably connected to two pulleys 302, and the two pulleys 302 are rollingly connected to the sliding bars 301. An annular groove is drilled at the center of the pulley 302, and the pulley 302 is clamped with the sliding bar 301 through the annular groove to enable the pulley 302 to slide on the sliding bar 301.

[0030] The vertical sliding assembly 4 includes a lower pressing block 401 rotatably connected to the pulley 302, two groups of adjusting plates 402 are plugged into the lower pressing block 401, and sliding holes matching the adjusting plates 402 are drilled on the horizontal plate 404. The adjusting plates 402 are plugged into the sliding holes of the horizontal plate 404. The lower ends of each group of adjusting plates 402 are welded and fixedly connected to the limiting plate 403. The upper ends of the two groups of adjusting plates 402 are fixedly connected to the same horizontal plate 404 by screws. The upper side wall of the lower pressing block 401 is fixed by the shaft. The bearing is rotatably connected with a screw rod 405, and the screw rod 405 is threadedly connected to the horizontal plate 404. A connecting plate 406 is provided between the two sets of limit plates 403. The left and right side walls of the connecting plate 406 are fixedly connected with two rollers 407 in contact with the adjustment plate 402. The lower ends of the two rollers 407 are welded and fixedly connected with the same magnetic plate 408. An electromagnet 409 is fixedly connected between the two sets of adjustment plates 402, and the electromagnet 409 and the magnetic plate 408 repel each other magnetically. The electromagnet 409 is connected to an external power source through a wire, which is not shown in the figure, and the electromagnet 409 and the magnetic plate 408 repel each other magnetically. The side wall opposite to the magnetic plate 408 and the electromagnet 409 is set to the same pole. When the external power supply is turned on, the electromagnet 409 starts and pushes the magnetic plate 408 downward through the principle of magnet repulsion of the same poles.

[0031] The reset assembly 5 includes two sliding pieces 501 which are slidably connected to the opposite side walls of the two fixed plates 201 respectively. The opposite side walls of the two fixed plates 201 are each provided with a sliding groove matching the sliding piece 501. The sliding piece 501 is clamped inside the sliding groove to realize the up and down movement of the reset frame 502. The two sliding pieces 501 are fixedly connected with the same reset frame 502 by bolts. The inner size of the reset frame 502 is the same as the outer size of the lower pressing block 401. The upper ends of the two fixed plates 201 are fixedly connected with a magnet plate 503 welded thereto, and the magnet plate 503 is magnetically attracted to the sliding piece 501. When not in use, the reset frame 502 is supported on the upper end of the fixed plate 201 by the magnetic effect of the sliding piece 501 and the magnet plate 503.

[0032] Principle and process of this utility model:

[0033] Before testing the rock sample 105, the staff first needs to place the rock sample 105 between the stop block 104 and the straight shear block 102, and the rock sample 105 and the stop block 104 are close to each other. Figure 1 As shown, the staff starts the electromagnet 409, so that the electromagnet 409 pushes the magnetic plate 408 downward through magnetic force. At this time, the magnetic plate 408 can give the rock sample 105 a downward pressure. Then the staff rotates the screw rod 405 to move the horizontal plate 404 and the adjustment plate 402 downward together, so that the limit plate 403 does not contact the roller 407. In this way, when the magnetic plate 408 moves later, friction between the roller 407 and the limit plate 403 can be avoided.

[0034] After the above steps are completed, the staff starts the hydraulic mechanism, which pushes the rock sample 105 through the driving rod 103 and the straight shear block 102. Under the continuous pressure of the hydraulic mechanism, the rock sample 105 is destroyed. Figure 4 and Figure 5 As shown, when the rock sample 105 is damaged, the magnetic plate 408 will also move with the rock sample 105, thereby improving the accuracy of the shear strength test of the rock sample. This is different from the traditional method of pressing down the rock sample 105. Since the traditional pressure shaft does not move itself, the damaged rock sample 105 will generate friction with the pressure shaft, thereby affecting the experimental results.

[0035] When the rock sample 105 is damaged and its upper part moves laterally, the reset frame 502 will also move with the upper part of the rock sample 105, thereby avoiding friction caused by lateral movement between the rock sample 105 and the magnetic plate 408, and further improving the accuracy of the shear strength test of the rock sample;

[0036] When testing the next rock sample 105, the staff can push the reset frame 502 downward, and then move the lower pressing block 401 to the inside of the reset frame 502, so as to complete the reset of the lower pressing block 401, thereby improving the test efficiency of the device.

[0037] In view of current practical needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A compression shear test device for fractured rock mass, comprising a detection assembly (1) characterized in that: The detection assembly (1) comprises a detection platform (101), the upper side wall of the detection platform (101) is slidably connected to a direct shear block (102), the direct shear block (102) is fixedly connected to a driving rod (103), the upper side wall of the detection platform (101) is fixedly connected to a stop block (104), a rock sample (105) is placed on the detection platform (101) and is located between the stop block (104) and the direct shear block (102), and a downward pressure assembly is installed on the upper side wall of the detection platform (101). The pressing component (2) comprises two fixed plates (201), a mounting frame (202) is fixedly connected between the two fixed plates (201) and the detection platform (101), a horizontal sliding component (3) is installed between the two fixed plates (201), a vertical sliding component (4) is slidably connected to the horizontal sliding component (3), and a reset component (5) located directly above the vertical sliding component (4) is slidably connected to a side wall of the fixed plate (201) relative to the fixing plate (201).

2. A compression shear test device for fractured rock mass according to claim 1, characterized in that: The transverse sliding assembly (3) comprises two sliding bars (301) fixed between two fixed plates (201), and the front and rear side walls of the vertical sliding assembly (4) are both rotatably connected to two pulleys (302), and the two pulleys (302) are rollingly connected to the sliding bars (301).

3. A compression shear test device for fractured rock mass according to claim 2, characterized in that: The vertical sliding assembly (4) comprises a lower pressing block (401) rotatably connected to the pulley (302), two groups of adjustment plates (402) are plugged into the lower pressing block (401), and the lower end of each group of adjustment plates (402) is fixedly connected to a limiting plate (403).

4. A compression shear test device for fractured rock mass according to claim 3, characterized in that: The upper ends of the two groups of adjustment plates (402) are fixedly connected to the same transverse plate (404), the upper side wall of the lower pressing block (401) is rotatably connected to a screw rod (405), and the screw rod (405) is threadedly connected to the transverse plate (404).

5. A compression shear test device for fractured rock mass according to claim 4, characterized in that: A connecting plate (406) is provided between the two groups of the limiting plates (403), two rollers (407) are fixedly connected to the left and right side walls of the connecting plate (406), the lower ends of the two rollers (407) are fixedly connected to the same magnetic plate (408), an electromagnet (409) is fixedly connected between the two groups of the adjusting plates (402), and the electromagnet (409) and the magnetic plate (408) are magnetically repelled from each other.

6. A compression shear test device for fractured rock mass according to claim 5, characterized in that: The reset assembly (5) comprises two sliding sheets (501) respectively connected in a sliding manner to opposite side walls of two fixed plates (201), and a reset frame (502) is fixedly connected between the two sliding sheets (501).

7. A compression shear test device for fractured rock mass according to claim 6, characterized in that: The upper ends of the two fixed plates (201) are both fixedly connected with a magnet plate (503), and the magnet plate (503) and the sliding plate (501) are magnetically attracted to each other.

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