Investigation on fracture mechanism of coal rock on three-point bending tests under different gas pressures

被引：0

作者：

Yin Z.-Q. ^{[1
,2
]}

Xie G.-X. ^{[1
,2
]}

Hu Z.-X. ^{[1
,2
]}

Zhu C.-Q. ^{[1
,2
]}

机构：

[1] Key Laboratory of Deep Coal Mine Excavation Response & Disaster Prevention and Control, Anhui University of Science and Technology, Huainan

[2] School of Mineral & Safety, Anhui University of Science and Technology, Huainan

来源：

Meitan Xuebao/Journal of the China Coal Society | 2016年 / 41卷 / 02期

关键词：

Coal containing gas; Digital speckle correlation method; Fracture toughness; Semi-circular bend;

D O I：

10.13225/j.cnki.jccs.2015.0598

中图分类号：

学科分类号：

摘要：

To investigate the opening-mode (mode-I) fracture toughness and the crack propagation characteristic of coal containing gas, semi-circular bend coal specimens with central straight cracks were tested with the self-developed visible gas-solid coupling test equipment under different molding pressures. The results show that mode-I fracture toughness and rupture energy decrease of coal area obviously influenced by gas. The fracture toughness and the rupture energy decrease with the increase in gas pressure, but the deflection and plastic deformation of coal increases with the increase in gas pressure. Crack propagation velocity becomes faster as gas pressure increases. When gas pressure increases from 0 to 1.5 MPa, the crack velocity increases form 78 m/s to 239 m/s, and when cracks are gradually propagating, the crack velocity sharply decreases. On the basis of the digital speckle correlation method, the full deformation field of gas-containing coal at the mesoscopic scale has been successfully measured, and the whole failure process and damage evolution of the coal containing gas is revealed by the lateral displacement and strain of coal specimens. © 2016, China Coal Society. All right reserved.

引用

页码：424 / 431

页数：7

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