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Device and method for reducing surrounding rock-lining contact surface generated by tension splitting

A contact surface and contact surface model technology, which is applied in the field of devices for restoring the surrounding rock-lining contact surface produced by tension splitting, and the surrounding rock-lining contact surface, can solve the problem that the shear test cannot be repeated

Active Publication Date: 2019-02-19
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the shear test of the contact surface cannot be repeated, and facilitate the study of the shear test of the contact surface

Method used

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  • Device and method for reducing surrounding rock-lining contact surface generated by tension splitting
  • Device and method for reducing surrounding rock-lining contact surface generated by tension splitting
  • Device and method for reducing surrounding rock-lining contact surface generated by tension splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Restoring the surrounding rock-lining contact surface includes the following steps:

[0040] According to the drilling and blasting method, the rock mass on the face of the tunnel splits due to impact tensile stress to form the surrounding rock-lining contact surface. The Brazilian disc test method is used to test a cylindrical rock with a diameter of 150mm and a thickness of 150mm. The sample is split, and a higher loading rate is used in splitting to simulate the impact of blasting; after the test, a split contact surface with a projected area of ​​150×150mm is obtained, and a high-precision three-dimensional scanning device is used to conduct the split contact surface Scan to obtain the split contact surface point cloud data in the form of three-dimensional coordinates and import it into MATLAB software for interpolation fitting, generate CAD script files, load the CAD script files into CAD to form the three-dimensional surface of the split contact surface, and perform t...

Embodiment 2

[0048] Using the device for restoring the surrounding rock-lining contact surface produced by tension splitting as described in Example 1, the method of restoring the surrounding rock-lining contact surface produced by tension splitting was carried out to prepare a 150×150×150mm test In this way, the thickness of the surrounding rock-lining contact surface model 1 is 10mm, so the distance between the inner side of the left side plate 4 and the inner side of the right side plate 5 is 160mm, and the distance between the inner side of the front panel 2 and the inner side of the rear panel 3 is 150mm. The height of the left side panel 4, right side panel 5, front panel 2 and rear panel 3 is 150mm. Use screws to fix the left side panel 4, right side panel 5, front panel 2 and rear panel 3 on the bottom plate 6. The side panel 4, the right side panel 5, the front panel 2 and the rear panel 3 are enclosed in a box mold, the surrounding rock-lining contact surface model 1 is placed in t...

Embodiment 3

[0050] Using the device for restoring the surrounding rock-lining contact surface produced by tension splitting as described in Example 1, the method of restoring the surrounding rock-lining contact surface produced by tension splitting was carried out to prepare a 150×150×150mm test In this way, the thickness of the surrounding rock-lining contact surface model 1 is 10mm, so the distance between the inner side of the left side plate 4 and the inner side of the right side plate 5 is 160mm, and the distance between the inner side of the front panel 2 and the inner side of the rear panel 3 is 150mm. The height of the left side panel 4, right side panel 5, front panel 2 and rear panel 3 is 150mm. Use screws to fix the left side panel 4, right side panel 5, front panel 2 and rear panel 3 on the bottom plate 6. The side panel 4, the right side panel 5, the front panel 2 and the rear panel 3 are enclosed in a box mold, the surrounding rock-lining contact surface model 1 is placed in t...

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Abstract

The invention discloses a device for reducing a surrounding rock-lining contact surface generated by tension splitting, comprising a bottom plate. A square mold is arranged on the bottom plate, and comprises a left side plate, a right side plate, a front panel and a rear panel which are vertically arranged on the bottom plate. A surrounding rock-lining contact surface model is arranged in a squaremold. The left side plate is provided with a plurality of left side plate threaded holes. The right side plate is provided with a plurality of right side plate threaded holes. A threaded end of a left fixing bolt is screwed into the threaded hole of the left side plate and abuts to one face of the surrounding rock-lining contact surface model. The threaded end of a right fixing bolt is screwed into the threaded hole of the right side plate and abuts to the other face of the surrounding rock-lining contact surface model. The invention further discloses a method for reducing the surrounding rock-lining contact surface generated by tension splitting, and can be used to prepare samples containing surrounding rock-lining contact surfaces. The position and angle of the surrounding rock-lining contact surface model are adjusted to achieve the preparation of different inclination angles and different thickness contact surfaces through a length scale and an angle scale.

Description

Technical field [0001] The invention belongs to the field of rock-soil experimental devices, in particular to a device for reducing the surrounding rock-lining contact surface produced by tension splitting, and also relates to a method for reducing the surrounding rock-lining contact surface produced by tension splitting. Background technique [0002] At present, tunnel excavation is mostly carried out by drilling and blasting. The stress waves emitted by blasting produce radial cracks. These cracks will preferentially propagate parallel to the direction of the principal stress of the local stress field, that is, the hoop direction, thus forming between adjacent blastholes. The rock mass splitting surface is generally supported by shotcrete after the blasting construction is completed. The rock mass splitting surface evolves into the surrounding rock-lining interface, which is similar to the study of rock mass structural planes. The formed wall rock-lining contact surface is also...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/28G01N1/286
Inventor 张茂础崔臻盛谦周光新马亚丽娜梅贤丞
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI