Estimation of Crack Initiation and Propagation Thresholds of Confined Brittle Coal Specimens Based on Energy Dissipation Theory

被引:0
|
作者
Jianguo Ning
Jun Wang
Jinquan Jiang
Shanchao Hu
Lishuai Jiang
Xuesheng Liu
机构
[1] Co-Founded By Shandong Province and the Ministry of Science and Technology,State Key Laboratory of Mining Disaster Prevention and Control
[2] Shandong University of Science and Technology,undefined
来源
Rock Mechanics and Rock Engineering | 2018年 / 51卷
关键词
Acoustic emission; Coal damage; Energy accumulation and dissipation; Crack damage initiation; Crack damage stress;
D O I
暂无
中图分类号
学科分类号
摘要
A new energy-dissipation method to identify crack initiation and propagation thresholds is introduced. Conventional and cyclic loading–unloading triaxial compression tests and acoustic emission experiments were performed for coal specimens from a 980-m deep mine with different confining pressures of 10, 15, 20, 25, 30, and 35 MPa. Stress–strain relations, acoustic emission patterns, and energy evolution characteristics obtained during the triaxial compression tests were analyzed. The majority of the input energy stored in the coal specimens took the form of elastic strain energy. After the elastic-deformation stage, part of the input energy was consumed by stable crack propagation. However, with an increase in stress levels, unstable crack propagation commenced, and the energy dissipation and coal damage were accelerated. The variation in the pre-peak energy-dissipation ratio was consistent with the coal damage. This new method demonstrates that the crack initiation threshold was proportional to the peak stress (σp) for ratios that ranged from 0.4351 to 0.4753σp, and the crack damage threshold ranged from 0.8087 to 0.8677σp.
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页码:119 / 134
页数:15
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