Test method for mechanical properties of coal in coal-rock combination under dynamic and combined dynamic and static loads

A combination of load and test method technology, applied in the direction of strength characteristics, scientific instruments, instruments, etc., can solve the problems that cannot reflect the mechanical properties of coal, etc., and achieve the effects of easy matching of acoustic impedance, quality impact resistance, and large piezoelectric coefficient

Active Publication Date: 2019-07-05
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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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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  • Test method for mechanical properties of coal in coal-rock combination under dynamic and combined dynamic and static loads
  • Test method for mechanical properties of coal in coal-rock combination under dynamic and combined dynamic and static loads
  • Test method for mechanical properties of coal in coal-rock combination under dynamic and combined dynamic and static loads

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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 test method for the mechanical properties of coal in a coal-rock combination under dynamic and dynamic and static combined loads. The existing test piece of the coal-rock combination is used to start with rocks that are not easy to be crushed, and the SHPB test device is used. The coal-rock combination is tested by pasting strain gauges, the stress of the coal is obtained from the stress at both ends of the coal specimen, and the coal-rock combination under dynamic load is obtained by inverse calculation based on the strain of the rock in the coal-rock combination. Variations in coal strain. The invention not only obtains the mechanical properties of coal in a certain surrounding rock environment, but also better guides on-site engineering practice, and has great guiding significance for revealing the real failure mechanism of engineering coal bodies.

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 Patents(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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