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Omnidirectional dynamic observation method for uniaxial compression crack propagation in coal and rock mass

A crack propagation and uniaxial compression technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the problems that a single camera is difficult to reflect the overall crack growth, analysis distortion, crack growth dependence, etc.

Inactive Publication Date: 2017-02-22
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

For uniaxial compression, it is a triaxial stress state, and its crack growth is asymmetrical. It is difficult to reflect the overall crack growth situation with a single camera, and even partial generalization may occur, resulting in analysis distortion. CT real-time scanning Although it has the advantage of three-dimensional display of crack growth, it also has the disadvantage that crack growth depends heavily on post-processing

Method used

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  • Omnidirectional dynamic observation method for uniaxial compression crack propagation in coal and rock mass

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Embodiment Construction

[0034] An all-round dynamic observation method for uniaxial compression crack propagation of coal and rock mass includes the following steps:

[0035] S101: Select the coal block in the coal mining face of the mine, and drill a standard compression test cylinder of φ50mm×100mm. The processing accuracy of the sample, the requirements and preparation of the compression instrument, and the requirements for the placement of the sample are all in accordance with the standards of the International Society of Rock Mechanics.

[0036] S102: Draw 8 vertical straight lines on the coal sample so that the included angle between them is 45°, and the labels are A1, A2, A3, ..., A8. Use a ruler to measure the midpoints of the eight vertical straight lines, and use the Tajima hand-rolled ink fountain ink line PS-RAKT to connect the eight points in turn into a closed horizontal curve.

[0037] S103: Taking the specific position of the cylindrical coal body on the workbench as the center, place...

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Abstract

The invention belongs to the field of coal and rock mass mechanics, and in particular relates to an omnidirectional dynamic observation method for an overall process of crack propagation during uniaxial compression in coal and rock mass, which is a supplement to the existing crack propagation observation method, and is suitable for omnidirectional dynamic observation for an overall process of crack propagation during uniaxial compression in coal and rock mass. The invention aims to provide an omnidirectional dynamic observation method for an overall process of crack propagation during uniaxial compression in coal and rock mass, and finally realizes the display of the omnidirectional crack propagation at any moment during uniaxial compression in coal and rock mass, which is of great significance to study on the stability of coal and rock mass and the related engineering practice.

Description

technical field [0001] The invention belongs to the field of coal and rock mechanics, in particular to an all-round dynamic observation method for the whole process of crack expansion of coal and rock mass during uniaxial compression, which is a supplement to the existing crack expansion observation method and is suitable for all-round dynamic observation of coal and rock mass. The whole process of crack propagation in rock mass under uniaxial compression. Background technique [0002] Analyzing the whole process of crack propagation in coal and rock mass is one of the ways to understand the mechanical properties of coal and rock mass, and it is of great significance for the stability analysis of coal mine roadways and stopes. At present, there are generally three methods for the observation of crack propagation in coal and rock mass, which are single-camera shooting during uniaxial compression, Brazilian disc single-camera shooting, and CT real-time scanning. The disc test...

Claims

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Application Information

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IPC IPC(8): G01N3/06G01N3/08
CPCG01N3/068G01N3/08G01N2203/0019G01N2203/0066G01N2203/0252G01N2203/0652
Inventor 郝宪杰赵毅鑫张重发李亚博王俊哲朱广沛卢志国
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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