A water-rich surrounding rock stability test device

Abstract

The application relates to the technical field of tunnel surrounding rock testing, and particularly discloses a water-rich surrounding rock stability test device, which comprises a bottom plate, two vertical plates are fixedly connected to the upper side of the bottom plate, a plurality of surrounding rock wall plates are arranged in a stacked mode above the vertical plates, the two vertical plates and the plurality of surrounding rock wall plates form an integral surrounding rock, an arc-shaped guide rail is arranged above the integral surrounding rock, and a top pressurizing device is slidably connected to the arc-shaped guide rail; when the stability test is carried out, one of the surrounding rock wall plates is removed, a surrounding rock test piece is placed at the position and is supported by a supporting device, the surrounding rock test piece is pressed by the top pressurizing device, and thus the stability of the surrounding rock test piece is tested. The water-rich surrounding rock stability test device provided by the application can simulate the stability test of different positions of the surrounding rock by replacing the surrounding rock wall plates at different positions, and the surrounding rock test piece is simulated to be in normal working conditions when being extruded, so that the test result is more accurate compared with the test result of directly placing the surrounding rock test piece on a flat plate and extruding the surrounding rock test piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel surrounding rock testing, and particularly relates to a water-rich surrounding rock stability test device. BACKGROUND

[0002] Water-rich surrounding rock stability test is an important research content in geotechnical engineering, tunnel engineering and underground engineering, and mainly aims at evaluating the mechanical properties, permeability characteristics and long-term stability of surrounding rock under the condition of rich groundwater (water-rich).

[0003] In the prior art, when the water-rich surrounding rock is tested, water is injected into the surrounding rock test piece, and after soaking for a certain period of time, the surrounding rock test piece is directly placed on a flat plate, and then extruded by a press machine to test whether the surrounding rock is unstable under the action of pressure. However, when the surrounding rock test piece is extruded in this way, the state of the test piece is inconsistent with the working state of the surrounding rock, so that the test result may not be accurate when the stability test is performed. SUMMARY

[0004] The present application relates to the technical field of tunnel surrounding rock testing, and particularly relates to a water-rich surrounding rock stability test device.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A water-rich surrounding rock stability test device, comprising a bottom plate, two vertical plates are fixedly connected to the upper side of the bottom plate, a plurality of surrounding rock wall plates are stacked above the vertical plates, each surrounding rock wall plate is provided with an arc-shaped hole on one side, the arc-shaped holes of the surrounding rock wall plates are correspondingly arranged, the two vertical plates and the plurality of surrounding rock wall plates form an overall surrounding rock, an arc-shaped guide rail is arranged above the overall surrounding rock, and a top pressing device is slidably connected to the arc-shaped guide rail.

[0007] When the stability test is performed, one of the surrounding rock wall plates is removed, a surrounding rock test piece is placed at the position and supported by a supporting device, the surrounding rock test piece is pressed by the top pressing device to test the stability of the surrounding rock test piece.

[0008] The supporting device comprises two supporting portions symmetrically arranged on both sides of the surrounding rock test piece, each supporting portion comprises a fixed plate, an arc-shaped sleeve is slidably connected to the center hole of the fixed plate, and the arc-shaped sleeve is slidably connected to the arc-shaped hole; the surrounding rock test piece is provided with a fissure, the surrounding rock test piece is provided with a water injection hole, the water injection hole is in communication with the fissure, the arc-shaped sleeve is provided with a water injection pipe, and the water injection pipe is correspondingly arranged with the water injection hole.

[0009] Preferably, the two sides of the bottom plate are provided with sliding rails, and a moving vehicle is slidably connected to each sliding rail, and the two ends of the arc-shaped guide rail are fixed on the moving vehicles.

[0010] Preferably, the top pressing device comprises a sliding seat capable of sliding on the arc-shaped guide rail, a hydraulic cylinder fixedly connected on the sliding seat, and a pressing plate fixedly connected on the retractable end of the hydraulic cylinder, with a pressure sensor arranged between the pressing plate and the retractable end of the hydraulic cylinder.

[0011] Preferably, one end of the arc-shaped sleeve is fixedly connected with a sleeve ring, one side of the sleeve ring is fixedly connected with a supporting plate through a spring, and a plurality of displacement sensors are arranged between the supporting plate and the fixed plate.

[0012] Preferably, the standing plate is provided with a mounting groove, and an electric telescopic rod is hinged between the inner wall of the mounting groove and the arc-shaped sleeve.

[0013] Preferably, the sleeve ring is fixedly connected with a rammer on one side, and the rammer can pass through the gap in the supporting plate.

[0014] The water-rich surrounding rock stability test device provided by the application can simulate the stability test of different positions of surrounding rock by replacing the surrounding rock wall plates at different positions, and the surrounding rock test piece is simulated to be in normal working condition when being extruded, so that the test result is more accurate than that of the prior art in which the test piece is directly placed on a flat plate and extruded. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application in any way. In the drawings:

[0016] Figure 1 is a basic structure diagram of the water-rich surrounding rock stability test device provided by the application;

[0017] Figure 2 is a partial sectional view of the water-rich surrounding rock stability test device provided by the application;

[0018] Figure 3 is a connection structure diagram of the supporting device and the surrounding rock test piece;

[0019] Figure 4 is Figure 2 the front view of

[0020] Figure 5 is Figure 4 the enlarged view of A of DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0022] Example 1

[0023] As Figures 1-5 shown, the water-rich surrounding rock stability test device of the embodiment comprises a bottom plate 1, two vertical plates 2 are fixedly connected to the upper side of the bottom plate 1, a plurality of surrounding rock wall plates 3 are stacked above the vertical plates 2, each surrounding rock wall plate 3 is provided with an arc-shaped hole, the arc-shaped holes of the surrounding rock wall plates 3 are correspondingly arranged, and the vertical plates 2 and the surrounding rock wall plates 3 are made of metal materials. In the embodiment, stainless steel materials are used.

[0024] The two vertical plates 2 and the plurality of surrounding rock wall plates 3 form an overall surrounding rock, an arc-shaped guide rail 53 is arranged above the overall surrounding rock, and a top pressing device 5 is slidably connected to the arc-shaped guide rail 53. The bottom plate 1 is provided with sliding rails 51 on both sides, each sliding rail 51 is slidably connected to a moving trolley 52, and the two ends of the arc-shaped guide rail 53 are fixedly connected to the moving trolleys 52. The top pressing device 5 comprises a sliding seat 54, the sliding seat 54 can slide on the arc-shaped guide rail 53, a hydraulic cylinder 55 is fixedly connected to the sliding seat 54, a pressing plate 57 is fixedly connected to the extension end of the hydraulic cylinder 55, and a pressure sensor 56 is arranged between the pressing plate 57 and the extension end of the hydraulic cylinder 55.

[0025] When the stability test is performed, one of the surrounding rock wall plates 3 is removed, a surrounding rock test piece 4 is placed at the position and supported by a supporting device 6. The supporting device 6 comprises two symmetrically arranged supporting portions, each supporting portion comprises a fixed plate 61, an arc-shaped sleeve 62 is slidably connected to the center hole of the fixed plate 61, one end of the arc-shaped sleeve 62 is fixedly connected to a sleeve ring 67, the sleeve ring 67 is a circular ring or a rectangular ring, a plurality of tamping rods 68 are fixedly connected to one side of the sleeve ring 67, and the tamping rods 68 can pass through the accommodation holes of a supporting plate 64. The sleeve ring 67 is fixedly connected to the supporting plate 64 on one side through a spring 63, and a plurality of displacement sensors 66 are arranged between the supporting plate 64 and the fixed plate 61. The arc-shaped sleeve 62 is slidably connected in the arc-shaped hole, and an installation groove 21 is arranged on the vertical plate 2, and an electric telescopic rod 22 is hinged between the inner wall of the installation groove 21 and the arc-shaped sleeve 62. The surrounding rock test piece 4 is pressed by the top pressing device 5, so that the stability of the surrounding rock test piece 4 is tested. A fissure 41 is arranged in the surrounding rock test piece 4, a water injection hole 42 is arranged in the surrounding rock test piece 4, the water injection hole 42 is in communication with the fissure 41, a water injection pipe 69 is arranged in the arc-shaped sleeve 62, and the water injection pipe 69 is correspondingly arranged with the water injection hole 42.

[0026] In use, different positions of the surrounding rock wall plate 3 are replaced to simulate the test of the stability of different positions of the surrounding rock, and the surrounding rock test piece 4 is simulated to be in a normal working condition when being extruded, and the test result is more accurate than that of the prior art in which the test piece is directly placed on a flat plate for extrusion. In the test process, the surrounding rock test piece 4 is watered through the water injection pipe 69 to simulate the water-rich state of the surrounding rock test piece 4. The water injection pipe 69 is a hose, and the water injection pipe 69 is arranged corresponding to the water injection hole 42. When the surrounding rock test piece 4 is extruded, the hose basically does not generate interference force to the surrounding rock test piece 4, so that the test effect is more accurate. When the supporting device 6 supports the surrounding rock test piece 4, the surrounding rock test piece 4 is between the two supporting plates 64 under the action of gravity. At this time, the measurement value of each displacement sensor 66 is different. At this time, the measurement value is the initial state. When the surrounding rock test piece 4 is pressed by the pressing plate 57, the surrounding rock test piece 4 is deformed and generates a thrust to the supporting plate 64, so that the supporting plate 64 moves. The deformation condition of the surrounding rock test piece 4 can be obtained by the change of the measurement value of the displacement sensor 66, so as to deduce the pressure under which the surrounding rock test piece 4 loses stability. The pressure of the pressing plate on the surrounding rock test piece 4 can be determined by the pressure sensor. After the test is completed, the surrounding rock test piece 4 needs to be removed. In order to facilitate the removal, the arc-shaped sleeve 62 is moved by the electric telescopic rod 22, and the sleeve ring 67 is moved when the arc-shaped sleeve 62 moves, so that the rammer 68 is inserted into the surrounding rock test piece 4, thereby damaging the surrounding rock test piece 4. In this process, in order to prevent the supporting plate 64 from colliding with the displacement sensor, the jack 65 is arranged on one side of the fixed plate 61. The supporting plate 64 is pushed by the jack 65, so that the supporting plate 64 does not contact the displacement sensor. In this way, the displacement sensor can be protected. In the test process, the position of the pressing plate 57 is changed by moving the moving vehicle 52, so that the surrounding rock test piece 4 is extruded from different positions, and the position most prone to instability is obtained.

Claims

1. A water-rich surrounding rock stability testing device, characterized in that: Includes a base plate (1), two upright plates (2) are fixedly connected to the upper side of the base plate (1), and multiple surrounding rock wall panels (3) are stacked on top of the upright plates (2). Each surrounding rock wall panel (3) has an arc-shaped hole on one side, and the arc-shaped holes of the surrounding rock wall panels (3) are all correspondingly set. The two upright plates (2) and the multiple surrounding rock wall panels (3) form an integral surrounding rock. An arc-shaped guide rail (53) is provided above the integral surrounding rock, and a top pressure device (5) is slidably connected to the arc-shaped guide rail (53). During the stability test, one of the surrounding rock wall panels (3) was removed, and a surrounding rock specimen (4) was placed there and supported by a support device (6). Pressure was applied to the surrounding rock specimen (4) by the top pressure device (5) to test the stability of the surrounding rock specimen (4). The supporting device (6) includes two supporting parts symmetrically arranged on both sides of the surrounding rock specimen (4). Each supporting part includes a fixing plate (61). An arc-shaped sleeve (62) is slidably connected in the center hole of the fixing plate (61). The arc-shaped sleeve (62) is slidably connected in the arc-shaped hole. The surrounding rock specimen (4) is provided with a crack (41). The surrounding rock specimen (4) is provided with a water injection hole (42). The water injection hole (42) is connected to the crack (41). The arc-shaped sleeve (62) is provided with a water injection pipe (69). The water injection pipe (69) is correspondingly arranged with the water injection hole (42). The base plate (1) is provided with slide rails (51) on both sides, and a moving vehicle (52) is slidably connected to each slide rail (51). The two ends of the arc-shaped guide rail (53) are respectively fixed on the moving vehicle (52). One end of the arc-shaped sleeve (62) is fixedly connected to a collar (67), and one side of the collar (67) is fixedly connected to a support plate (64) by a spring (63). Multiple displacement sensors (66) are provided between the support plate (64) and the fixed plate (61). The displacement sensors (66) are used to obtain the deformation status of the surrounding rock specimen (4). The upright plate (2) is provided with an installation groove (21), and an electric telescopic rod (22) is hinged between the inner wall of the installation groove (21) and the arc sleeve (62). The collar (67) is fixedly connected to one side of the tamping rod (68), which can pass through the relief hole of the support plate (64).

2. The water-rich surrounding rock stability testing device according to claim 1, characterized in that: The top pressurizing device (5) includes a sliding seat (54) which slides on the arc-shaped guide rail (53). A hydraulic cylinder (55) is fixedly connected to the sliding seat (54). A pressure plate (57) is fixedly connected to the telescopic end of the hydraulic cylinder (55). A pressure sensor (56) is installed between the pressure plate (57) and the telescopic end of the hydraulic cylinder (55).

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