文献类型：期刊文献

英文题名：Damage characteristics and catastrophic failure mechanism of coal rock induced by gas adsorption under compression

作者：Xiao, Xiaochun[1];Wang, Lei[1];Xu, Jun[1];Lv, Xiangfeng[2];Guo, Pengfei[3];Pan, Yishan[4]

机构：[1]Liaoning Tech Univ, Sch Mech & Engn, Fuxing 123000, Peoples R China;[2]Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Beijing 100083, Peoples R China;[3]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[4]Liaoning Univ, Coll Phys, Shenyang 110036, Peoples R China

年份：2020

卷号：12

期号：3

起止页码：587

外文期刊名：JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000540806700013)、、Scopus(收录号：2-s2.0-85083632285)、WOS

基金：The authors are gratefully acknowledged to the financial support by the National Natural Science Foundation of China (Grant Nos. 51974186, 51774164 and 51774048).

语种：英文

外文关键词：Damage characteristics; Catastrophic failure mechanism; Adsorption damage; Coal rock

外文摘要：To reveal the damage characteristics and catastrophic failure mechanism of coal rock caused by gas adsorption, physical tests and theoretical methods are employed. The results show that adsorption swelling can damage coal rock, which can be distinguished by fractal dimension. A fitting relationship between the adsorption damage and fractal dimension is proposed by experimental testing and theoretical analysis. High gas adsorption pressure proves to be the dominant factor that leads to coal failure softening and gas outburst disasters. Three main parameters concerning adsorption damage include the change rate of released energy density, the transition difference in the post-peak acoustic emission (AE) b value and the change rate of cumulative AE energy. Results show that all the three parameters present a step-type decreasing change with the increase in fractal dimension, and the fractal dimension shows a linear relationship within the same failure mode. Finally, a method is proposed to evaluate coal rock disaster transformation, based on the aforementioned three main parameters of adsorption damage. (C) 2020 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).