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A device and method for restoring the surrounding rock-lining contact surface produced by tension splitting

A contact surface and contact surface model technology, which is applied to the device of the surrounding rock-lining contact surface, restores the field of the surrounding rock-lining contact surface caused by tension splitting, and can solve the problem that the shear test cannot be repeated.

Active Publication Date: 2020-05-26
INST OF ROCK & 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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  • A device and method for restoring the surrounding rock-lining contact surface produced by tension splitting
  • A device and method for restoring the surrounding rock-lining contact surface produced by tension splitting
  • A device and method for restoring the surrounding rock-lining contact surface produced 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 principle of drilling and blasting construction, the rock mass at the face of the tunnel is split and destroyed due to the impact tensile stress to form the surrounding rock-lining contact surface, using the Brazilian disc test method, the cylindrical rock with a diameter of 150 mm and a thickness of 150 mm was tested. The sample was split, and a higher loading rate was used in the split to simulate the blasting impact; after the test, a split contact surface with a projected area of ​​150×150mm was obtained, and a high-precision three-dimensional scanning device was used to conduct a split contact surface Scan to obtain the point cloud data of the split contact surface in the form of three-dimensional coordinates and import it into MATLAB software for interpolation and fitting, generate a CAD script file, load the CAD script file into the CAD, form a three-dimens...

Embodiment 2

[0048] Using a 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 test specimen with a size of 150×150×150mm. Like this, the thickness of the surrounding rock-lining contact surface model 1 is 10mm, so the distance between the inside of the left side plate 4 and the inside of the right side plate 5 is 160mm, and the distance between the inside of the front panel 2 and the inside of the rear panel 3 is 150mm. The heights of the left panel 4, the right panel 5, the front panel 2 and the rear panel 3 are all 150 mm, and the left panel 4, the right panel 5, the front panel 2 and the rear panel 3 are fixed on the bottom panel 6 with screws, and the left The side panel 4, the right side panel 5, the front panel 2 and the rear panel 3 form a square frame mold, place the surrounding rock-lin...

Embodiment 3

[0050] Using a 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 test specimen with a size of 150×150×150mm. Like this, the thickness of the surrounding rock-lining contact surface model 1 is 10mm, so the distance between the inside of the left side plate 4 and the inside of the right side plate 5 is 160mm, and the distance between the inside of the front panel 2 and the inside of the rear panel 3 is 150mm. The heights of the left panel 4, the right panel 5, the front panel 2 and the rear panel 3 are all 150 mm, and the left panel 4, the right panel 5, the front panel 2 and the rear panel 3 are fixed on the bottom panel 6 with screws, and the left The side panel 4, the right panel 5, the front panel 2 and the rear panel 3 form a square frame mold, place the surrounding rock-lining c...

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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 and soil experiment devices, and in particular relates to a device for restoring the surrounding rock-lining contact surface produced by tension splitting, and also relates to a method for restoring the surrounding rock-lining contact surface produced by tension splitting. Background technique [0002] At present, the drilling and blasting method is mostly used for tunnel excavation. The stress wave emitted by the blasting produces radial cracks, and these cracks will preferentially propagate parallel to the direction of the principal stress of the local stress field, that is, in the circumferential direction, thus forming in the middle of adjacent blast holes. The split surface of the rock mass is usually supported by sprayed concrete after the blasting construction is completed. The formed surrounding rock-lining contact surface is also of great significance, which is a breakthrough in the study of the conta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 & SOIL MECHANICS CHINESE ACAD OF SCI
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