干旱区生态环境知识资源中心(Arid): Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations

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	Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations
	Chen Tian; Yao Qiangling; Wei Fei; Chong Zhaohui; Zhou Jian; Wang Changbin; Li Jing
来源期刊	Journal of Central South University
ISSN	2095-2899
出版年	2017
卷号	24 期号:2 页码:423-431
英文摘要	Tackling the problems of underground water storage in collieries in arid regions requires knowledge of the effect of water intrusion and loading rate on the mechanical properties of and crack development in coal-rock combinations. Fifty-four coal-rock combinations were prepared and split equally into groups containing different moisture contents (dry, natural moisture and saturated) to conduct acoustic emission testing under uniaxial compression with loading rates ranging from 0.1 mm/min to 0.6 mm/min. The results show that the peak stress and strength-softening modulus, elastic modulus, strain-softening modulus, and post-peak modulus partly decrease with increasing moisture content and loading rate. In contrast, peak strain increases with increasing moisture content and fluctuates with rising loading rate. More significantly, the relationship between stiffness and stress, combined with accumulated counts of acoustic emission, can be used to precisely predict all phases of crack propagation. This is helpful in studying the impact of moisture content and loading rate on crack propagation and accurately calculating mechanical properties. We also determined that the stress thresholds of crack closure, crack initiation, and crack damage do not vary with changes of moisture content and loading rate, constituting 15.22%, 32.20%, and 80.98% of peak stress, respectively. These outcomes assist in developing approaches to water storage in coal mines, determining the necessary width of waterproof coal-rock pillars, and methods of supporting water-enriched roadways, while also advances understanding the mechanical properties of coal-rock combinations and laws of crack propagation.
英文关键词	water intrusion loading rate mechanical properties coal-rock combination crack propagation stress threshold
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Engineering
CSCD记录号	CSCD:5986055
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335804
作者单位	Chen Tian, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China, Xuzhou, Jiangsu 221116, China.; Yao Qiangling, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China, Xuzhou, Jiangsu 221116, China.; Wei Fei, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China, Xuzhou, Jiangsu 221116, China.; Chong Zhaohui, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China, Xuzhou, Jiangsu 221116, China.; Zhou Jian, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China, Xuzhou, Jiangsu 221116, China.; Wang Changbin, School of Mines, China University of Mining & Technology, Key Laboratory of Deep Coal Resource Mini...
推荐引用方式 GB/T 7714	Chen Tian,Yao Qiangling,Wei Fei,et al. Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations[J],2017,24(2):423-431.
APA	Chen Tian.,Yao Qiangling.,Wei Fei.,Chong Zhaohui.,Zhou Jian.,...&Li Jing.(2017).Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations.Journal of Central South University,24(2),423-431.
MLA	Chen Tian,et al."Effects of water intrusion and loading rate on mechanical properties of and crack propagation in coal-rock combinations".Journal of Central South University 24.2(2017):423-431.