True triaxial test cushion block device for measuring rock burst process containing cavern structure and positioning acoustic emission

Abstract

The utility model relates to the technical field of rock mechanics and nondestructive testing, in particular to a true triaxial test cushion block device for measuring a rock burst process containing a cavern structure and positioning acoustic emission, which comprises a base, the device further comprises a first cushion block, a second cushion block, a third cushion block, a fourth cushion block, a circular through hole, a mounting base, a driving block, an adjusting lead screw, a guide sliding rod and an acoustic emission sensor. A first cushion block is arranged on the rear side of the base, a second cushion block is arranged on the front side of the base, a third cushion block is arranged on the left side of the base, a fourth cushion block is arranged on the right side of the base, a circular through hole is formed in the upper end of the first cushion block, a mounting seat is arranged on the inner side of the first cushion block, and a micro camera module and an auxiliary lighting module are arranged at the upper end of the mounting seat; eight-channel acoustic emission monitoring arrangement under the true triaxial loading condition is achieved through the acoustic emission sensors, meanwhile, the whole rockburst process can be observed in real time through the micro camera module in the central cavern, and visual quantitative analysis is achieved in cooperation with the acoustic emission sensors.

Description

Technical Field

[0001] This utility model relates to the fields of rock mechanics and nondestructive testing technology, and in particular to a true triaxial test pad device for measuring the rockburst process and acoustic emission location of cavern structures. Background Technology

[0002] Rock mechanics experiments are experiments conducted directly on natural rocks. Experimental methods include ambient temperature and pressure experiments, ambient temperature and high pressure experiments, high temperature and high pressure experiments, long-term creep experiments, etc. They can be widely used to study the formation conditions, processes and mechanisms of rocks and minerals, deformation and phase transformation of rocks and minerals, dynamic diagenesis and mineralization processes and mechanisms, rock folding and rock fracture processes and mechanisms, as well as the mechanical properties of rocks and their manifestations under different geological conditions.

[0003] Currently, in rock mechanics experiments, the true triaxial loading test is an important means of studying the multi-directional stress characteristics of rock masses. It is a triaxial compression test that puts the rock specimen under a stress combination state with three principal stresses that are not equal. By combining it with acoustic emission monitoring technology, quantitative analysis of dynamic processes such as crack propagation and micro-fracture location can be achieved.

[0004] However, existing true triaxial loading systems generally lack convenient and reliable acoustic emission probe arrangement structures. Especially for complex samples with cavities, traditional devices are difficult to accurately acquire multi-dimensional acoustic emission information, making the arrangement and acquisition of multi-directional acoustic emission signals quite difficult. Utility Model Content

[0005] To overcome the common lack of convenient and reliable acoustic emission probe arrangement structures in true triaxial loading systems, especially for complex samples with cavities, traditional devices struggle to accurately acquire multi-dimensional acoustic emission information, leading to difficulties in arranging and acquiring multi-directional acoustic emission signals.

[0006] The technical solution of this utility model is as follows: a true triaxial test pad device for measuring the rockburst process and acoustic emission positioning of a cavern structure, comprising a base, and further comprising a first pad, a second pad, a third pad, a fourth pad, a circular through hole, a mounting base, a drive block, an adjusting screw, a guide slide rod, and an acoustic emission sensor; the first pad is provided on the rear side of the base, the second pad is provided on the front side of the base, the third pad is provided on the left side of the base, and the fourth pad is provided on the right side of the base; the upper end of the first pad has a circular through hole, the inner side of the first pad is provided with a mounting base, the upper end of the mounting base is provided with a miniature camera module and an auxiliary lighting module, the lower end of the mounting base is provided with a drive block, the lower part of the mounting base is provided with an adjusting screw, and the front and rear sides of the adjusting screw are provided with guide slide rods; the upper ends of the first pad, the second pad, the third pad, and the fourth pad are all provided with acoustic emission sensors.

[0007] Preferably, by setting a circular through hole, mounting base, drive block, adjusting screw, and guide slide, it is convenient to disassemble and maintain the miniature camera module and auxiliary lighting module. By setting a first pad, second pad, third pad, fourth pad, acoustic emission sensor, miniature camera module, and auxiliary lighting module, efficient arrangement and acquisition of multi-directional acoustic emission signals can be achieved. It can also take pictures of the interior of the cavern through the built-in camera device to record the entire process of rockburst.

[0008] Preferably, a central rock sample is placed on the upper end of the base, the second and first pads are respectively attached to the front and rear sides of the base, and the third and fourth pads are arranged symmetrically from left to right, and are respectively attached to the left and right sides of the base.

[0009] Preferably, the front and rear sides of the first pad are open, the lower end of the circular through hole is connected to the inner side of the first pad, and the front and rear sides of the mounting base and the inner side of the first pad are slidably connected by a sliding groove.

[0010] Preferably, the lower ends of the drive block and the mounting base are fixedly connected, the adjusting screw and the drive block are threadedly connected, the left and right ends of the adjusting screw are rotatably connected to the first pad, and the left end of the adjusting screw extends to the outside of the first pad and is fixedly mounted with a knob.

[0011] Preferably, the guide slide rod and the adjusting screw are arranged in parallel front to back, the left and right ends of the guide slide rod are fixedly connected to the first pad block, and the drive block and the outer side of the guide slide rod are slidably sleeved.

[0012] Preferably, the upper ends of the first pad, the second pad, the third pad, and the fourth pad are all provided with mounting grooves, the acoustic emission sensor and the inner side of the mounting groove are adapted to each other, and the lower end of the acoustic emission sensor and the inner side of the mounting groove are elastically connected by a tightening spring.

[0013] Preferably, the first and second pads have wiring holes 1 on their left and right sides, and the third and fourth pads have wiring holes 2 on their rear sides. Both wiring holes 1 and wiring holes 2 are connected to the mounting groove.

[0014] The beneficial effects of this utility model are:

[0015] 1. This true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavern structure achieves an eight-channel acoustic emission monitoring setup under true triaxial loading conditions through the setting of multiple acoustic emission sensors, supports three-dimensional positioning, and allows real-time observation of the entire rockburst process in the central cavern through a miniature camera module inside the first pad. Visualized quantitative analysis can be achieved in conjunction with the acoustic emission sensors. Each pad structure can be independently processed and replaced, possessing good versatility and economy. The device is compatible with mainstream true triaxial loading platforms and can be widely used in experimental scenarios such as rockburst simulation and tunnel stability analysis.

[0016] 2. This true triaxial test pad device for measuring the rockburst process and acoustic emission positioning of cavern structures uses a rotating adjusting screw to move the drive block to the outside of the first pad, facilitating the disassembly and maintenance of the miniature camera module and auxiliary lighting module. Attached Figure Description

[0017] Figure 1 The diagram shows a three-dimensional structure of the true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavern structure according to this invention. Figure 1 ;

[0018] Figure 2 The diagram shows a three-dimensional structure of the true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavern structure according to this invention. Figure 2 ;

[0019] Figure 3 The diagram shown is a three-dimensional structural schematic of the first pad of this utility model;

[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of the second pad of this utility model;

[0021] Figure 5 The diagram shown is a three-dimensional structural schematic of the third pad of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 2. First pad; 3. Second pad; 4. Third pad; 5. Fourth pad; 6. Circular through hole; 7. Mounting seat; 8. Drive block; 9. Adjusting screw; 91. Knob; 10. Guide slide rod; 11. Acoustic emission sensor. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figures 1-5This utility model provides an embodiment: a true triaxial test pad device for measuring the rockburst process and acoustic emission location of a cavern structure, including a base 1, and further including a first pad 2, a second pad 3, a third pad 4, a fourth pad 5, a circular through hole 6, a mounting base 7, a drive block 8, an adjusting screw 9, a guide slide rod 10, and an acoustic emission sensor 11; the first pad 2 is arranged on the rear side of the base 1, the second pad 3 is arranged on the front side of the base 1, the third pad 4 is arranged on the left side of the base 1, and the fourth pad 5 is arranged on the right side of the base 1; the upper end of the first pad 2 has a circular through hole 6, and the inner side of the first pad 2 is provided with a mounting base 7; the upper end of the mounting base 7 is provided with a miniature camera module and an auxiliary lighting module; the mounting base... A drive block 8 is provided at the lower end of the mounting base 7, and an adjusting screw 9 is provided below the mounting base 7. Guide slide rods 10 are provided on the front and rear sides of the adjusting screw 9. Acoustic emission sensors 11 are provided at the upper ends of the first pad 2, the second pad 3, the third pad 4, and the fourth pad 5. The arrangement of multiple acoustic emission sensors 11 realizes the eight-channel acoustic emission monitoring under true triaxial loading conditions, supports three-dimensional positioning, and allows the central cavern to observe the entire rockburst process in real time through the miniature camera module in the first pad 2. Visual quantitative analysis is achieved in conjunction with the acoustic emission sensors 11. By rotating the adjusting screw 9, the drive block 8 drives the mounting base 7 to move to the outside of the first pad 2, which facilitates the disassembly and maintenance of the miniature camera module and the auxiliary lighting module.

[0025] Please see Figures 1-4 In this embodiment, a central rock sample is placed on the upper end of the base 1. The second pad 3 and the first pad 2 are respectively attached to the front and rear sides of the base 1. The third pad 4 and the fourth pad 5 are arranged symmetrically from left to right, and are respectively attached to the left and right sides of the base 1. The front and rear sides of the first pad 2 are open, and the lower end of the circular through hole 6 is connected to the inner side of the first pad 2. The front and rear sides of the mounting base 7 and the inner side of the first pad 2 are slidably connected by a sliding groove. The driving block 8 is fixedly connected to the lower end of the mounting base 7. The adjusting screw 9 is threadedly connected to the driving block 8. The left and right ends of the adjusting screw 9 are rotatably connected to the first pad 2. The left end of the adjusting screw 9 extends to the outer side of the first pad 2 and is fixedly mounted. Equipped with a knob 91, a guide slide rod 10 and an adjusting screw 9 are arranged in parallel front and rear. The left and right ends of the guide slide rod 10 are fixedly connected to the first pad block 2. The drive block 8 is slidably sleeved with the outer side of the guide slide rod 10. The diameter of the circular through hole 6 is 50mm. The inner side of the first pad block 2 is a square cavity structure that can accommodate the installation of a miniature camera and its auxiliary lighting module (such as an LED light) for capturing the internal changes of the cavern in the rock sample. The arrangement of eight channels of acoustic emission monitoring under true triaxial loading conditions is realized through the setting of multiple acoustic emission sensors 11, which supports three-dimensional positioning. At the same time, the entire rockburst process can be observed in real time through the miniature camera module in the first pad block 2 in the central cavern, and visualized quantitative analysis can be achieved in conjunction with the acoustic emission sensors 11.

[0026] Please see Figures 2-5 In this embodiment, the upper ends of the first pad 2, the second pad 3, the third pad 4, and the fourth pad 5 are all provided with mounting grooves. The acoustic emission sensor 11 and the inner side of the mounting groove are mutually adapted. The lower end of the acoustic emission sensor 11 and the inner side of the mounting groove are elastically connected by a tightening spring. Wiring holes one is provided on the left and right sides of the first pad 2 and the second pad 3, and wiring holes two is provided on the rear side of the third pad 4 and the fourth pad 5. Wiring holes one and two are interconnected with the mounting groove. The first pad 2 and the second pad 3 are each provided with three mounting grooves for mounting the acoustic emission sensor 11. The three holes are distributed in a triangle. There are a total of eight acoustic emission sensors 11, which are arranged around the sample. This constitutes a three-dimensional acoustic emission positioning system. Each pad can be connected to the cylinder or rigid frame of the true triaxial loading system to achieve triaxial loading. The probe arrangement holes of all acoustic emission sensor 11 mounting slots are precision machined to fit the 8mm×8mm standard acoustic emission sensor 11 and are kept in stable contact by the tightening spring. By rotating the knob 91, the adjusting screw 9 can be rotated, causing the drive block 8 to slide along the guide slide rod 10, which moves the mounting seat 7 to the outside of the first pad 2, making it convenient to disassemble and maintain the miniature camera module and the auxiliary lighting module. Subsequently, the position of the mounting seat 7 can be adjusted by adjusting the screw 9 to align and reset the miniature camera module with the circular through hole 6.

[0027] During operation, rotating the knob 91 rotates the adjusting screw 9, causing the drive block 8 to slide along the guide slide rod 10, which moves the mounting base 7 to the outside of the first pad block 2. This facilitates the disassembly and maintenance of the miniature camera module and the auxiliary lighting module. Subsequently, the position of the mounting base 7 is adjusted by adjusting the screw 9 to align and reset the miniature camera module with the circular through hole 6. The setup of multiple acoustic emission sensors 11 enables an eight-channel acoustic emission monitoring arrangement under true triaxial loading conditions, supporting three-dimensional positioning. Simultaneously, the entire rockburst process can be observed in real time through the miniature camera module inside the first pad block 2 in the central chamber. Visualized quantitative analysis can be achieved in conjunction with the acoustic emission sensors 11. Each pad block structure can be independently processed and replaced, exhibiting good versatility and economy. The device is compatible with mainstream true triaxial loading platforms and can be widely used in experimental scenarios such as rockburst simulation and tunnel stability analysis.

[0028] Through the above steps, an eight-channel acoustic emission monitoring setup under true triaxial loading conditions is achieved by setting up multiple acoustic emission sensors 11, supporting three-dimensional positioning. At the same time, the entire rockburst process can be observed in real time through the micro-camera module in the first pad block 2 in the central chamber. Visual quantitative analysis can be achieved in conjunction with the acoustic emission sensors 11, which solves the problem that true triaxial loading systems generally lack convenient and reliable acoustic emission probe arrangement structures. Especially for complex samples with caverns, traditional devices are difficult to accurately collect multi-dimensional spatial acoustic emission information, which makes the arrangement and collection of multi-directional acoustic emission signals difficult.

Claims

1. A true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavern structure, comprising a base (1), characterized in that: It also includes a first pad (2), a second pad (3), a third pad (4), a fourth pad (5), a circular through hole (6), a mounting base (7), a drive block (8), an adjusting screw (9), a guide slide rod (10), and an acoustic emission sensor (11); the first pad (2) is provided on the rear side of the base (1), the second pad (3) is provided on the front side of the base (1), the third pad (4) is provided on the left side of the base (1), and the fourth pad (5) is provided on the right side of the base (1). The first pad (2) is... A circular through hole (6) is provided at the upper end. A mounting base (7) is provided on the inner side of the first pad (2). A miniature camera module and an auxiliary lighting module are provided at the upper end of the mounting base (7). A drive block (8) is provided at the lower end of the mounting base (7). An adjusting screw (9) is provided below the mounting base (7). Guide slide rods (10) are provided on the front and rear sides of the adjusting screw (9). An acoustic emission sensor (11) is provided at the upper end of the first pad (2), the second pad (3), the third pad (4), and the fourth pad (5).

2. The true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavernous structure according to claim 1, characterized in that: A central rock sample is placed on the upper end of the base (1). The second pad (3) and the first pad (2) are respectively attached to the front and rear sides of the base (1). The third pad (4) and the fourth pad (5) are arranged symmetrically on the left and right sides. The third pad (4) and the fourth pad (5) are respectively attached to the left and right sides of the base (1).

3. The true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavernous structure according to claim 1, characterized in that: The front and rear sides of the first pad (2) are open, and the lower end of the circular through hole (6) is connected to the inner side of the first pad (2). The front and rear sides of the mounting base (7) and the inner side of the first pad (2) are slidably connected by a sliding groove.

4. The true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavernous structure according to claim 1, characterized in that: The lower ends of the drive block (8) and the mounting base (7) are fixedly connected. The adjusting screw (9) and the drive block (8) are threadedly connected. The left and right ends of the adjusting screw (9) are rotatably connected to the first pad (2). The left end of the adjusting screw (9) extends to the outside of the first pad (2) and a knob (91) is fixedly installed.

5. The true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavern structure according to claim 1, characterized in that: The guide slide rod (10) and the adjusting screw (9) are arranged in parallel front and back. The left and right ends of the guide slide rod (10) are fixedly connected to the first pad block (2). The drive block (8) and the outer side of the guide slide rod (10) are slidably sleeved.

6. The true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavernous structure according to claim 1, characterized in that: The upper ends of the first pad (2), the second pad (3), the third pad (4), and the fourth pad (5) are all provided with mounting grooves. The acoustic emission sensor (11) and the inner side of the mounting groove are adapted to each other. The lower end of the acoustic emission sensor (11) and the inner side of the mounting groove are elastically connected by a tightening spring.

7. A true triaxial test pad device for measuring the rockburst process and acoustic emission localization of a cavernous structure according to claim 6, characterized in that: Wiring holes 1 are provided on the left and right sides of the first pad (2) and the second pad (3), and wiring holes 2 are provided on the rear side of the third pad (4) and the fourth pad (5). Wiring holes 1 and 2 are connected to the mounting groove.

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