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Method of testing mechanical properties of coal in coal-rock composite under dynamic loading and combined static and dynamic loading

A technology of combined load and test method, applied in the field of rock mechanics test, can solve the problem of not reflecting the mechanical properties of coal, and achieve the effects of easy matching of acoustic impedance, quality impact resistance, and high mechanical strength

Active Publication Date: 2017-11-03
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

However, this deformation and failure feature is the overall mechanical property of the combination, which still cannot reflect the real mechanical properties of coal under the condition of coal-rock combination.

Method used

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  • Method of testing mechanical properties of coal in coal-rock composite under dynamic loading and combined static and dynamic loading
  • Method of testing mechanical properties of coal in coal-rock composite under dynamic loading and combined static and dynamic loading
  • Method of testing mechanical properties of coal in coal-rock composite under dynamic loading and combined static and dynamic loading

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Embodiment Construction

[0066] Below in conjunction with the accompanying drawings, the test method for the mechanical properties of coal in the coal-rock combination under dynamic and dynamic and static combined loads of the present invention will be further described. In the embodiment, the test method of the mechanical properties of coal in the coal-rock combination under pure dynamic load is taken as an example for illustration.

[0067] The first step, specimen preparation

[0068] Take the sandstone sample in the 3# coal seam and its roof of Shandong Xinhe Mining Co., Ltd., and process the coal sample and rock sample into cylindrical coal single specimen 2 and rock single specimen 1 respectively. The diameter is 50 mm, and the height is 25 mm; the coal single specimen 2 and the rock single specimen 1 are combined, and AB superglue is used to paste them to form a coal-rock composite specimen 8, and the coal-rock composite specimen 8 is as follows: There are two types of coal-rock two-body combi...

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Abstract

The invention discloses a method of testing mechanical properties of coal in coal-rock composite under dynamic loading and combined static and dynamic loading. An existing coal-rock composite test piece is used; starting from rock less prone to crushing, an SHPB (split Hopkinson pressure bar) test device is used, coal-rock composite loading test is performed by means of attaching a strain gauge, stress of coal is acquired according to stress at each end face of the coal test piece, and stress variation of the coal in the coal-rock composite under dynamic loading. Mechanical properties of coal in a certain surrounding rock environment are acquired, better guidance can be provided for field engineering practice, and the method has major guiding significance for disclosing true failure mechanism of engineering coal.

Description

technical field [0001] The invention relates to a rock mass mechanics test method. Background technique [0002] Coal is a nonlinear and discontinuous complex mechanical medium containing a large number of micro-cavities and micro-cracks. From the perspective of rock classification standards, coal belongs to a kind of soft rock. The important basic parameters of roadway support design and so on. A large number of field practices have shown that in the process of underground coal mining, when disasters such as roadway instability, rock burst, and coal and gas outburst occur, the coal body is usually the first to be destroyed. Therefore, mastering the mechanical properties of coal can lay a foundation for studying the occurrence and prevention mechanism of dynamic disasters such as rock burst. [0003] At present, with regard to the physical and mechanical properties of coal at home and abroad, indoor loading tests are carried out with reference to ISRM recommended methods, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
CPCG01N3/00
Inventor 刘学生宁建国谭云亮顾清恒王军卜腾腾徐强
Owner SHANDONG UNIV OF SCI & TECH
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