Numerical investigation on crack development and energy evolution of stressed coal-rock combination

doi:10.1016/j.ijrmms.2020.104417

	Numerical investigation on crack development and energy evolution of stressed coal-rock combination
	Zhang, Heng 3; Lu, Cai-Ping 3,4,5; Liu, Bin 6; Liu, Yang 3; Zhang, Nong 1; Wang, Hong-Yu 2
刊名	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2020-09-01
卷号	133 页码:15
关键词	Coal-rock combination Acoustic emission Crack development Energy evolution Rockburst
ISSN号	1365-1609
DOI	10.1016/j.ijrmms.2020.104417
英文摘要	To uncover the failure and instability mechanism of coal-rock combination under loading, it is very crucial to investigate crack development and energy evolution. In this work, the uniaxial compressive and Brazilian split tests of coal-rock combinations were first performed. Secondly, the corresponding numerical models were built using the UDEC-Trigon method. Based on numerical results, the number, length and macroscopic area of cracks during failure and instability were determined, and the crack development and energy evolution rules were analysed. The main conclusions were obtained as follows: 1) the stress thresholds of crack initiation and damage of coal-rock combination rose with the increasing height ratio of coal to rock. The maximum event count of acoustic emission (AE) appeared earlier than the peak strength; 2) the failure and instability of coal-rock combination occurred when crack propagation and connection in central coal exceeded the damage limit. The shear failure was dominant mechanical behaviour of coal with the ratio 9:1 of shear to tensile fractures. The cracks connection was presented as a shear failure surface with an inclination angle of 15 degrees-30 degrees in coal and a vertical tensile failure plane in rock; and 3) the energy evolution in coal-rock combination was described as follows: the larger the height ratio of coal to rock is, the higher the cumulative energy is, and the faster the speed of energy dissipation is, indicating the higher risk of rockburst triggered by failure and instability of coal-rock combination.
资助项目	National Natural Science Foundation of China[51574225] ; Fundamental Research Funds for the Central Universities[YC150001] ; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
WOS研究方向	Engineering ; Mining & Mineral Processing
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000562048400003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24743]
专题	中科院武汉岩土力学所
通讯作者	Lu, Cai-Ping
作者单位	1.Xuzhou Normal Univ, Xuzhou 221116, Jiangsu, Peoples R China 2.Univ Western Australia, Dept Civil Environm & Min Engn, Sch Engn, Crawley, WA 6009, Australia 3.China Univ Min & Technol, Sch Mines, Key Lab Deep Coal Resource Min, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China 4.Univ Toronto, Dept Civil Engn, Toronto, ON MSS 1A4, Canada 5.Univ Toronto, Lassonde Inst, Toronto, ON MSS 1A4, Canada 6.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Heng,Lu, Cai-Ping,Liu, Bin,et al. Numerical investigation on crack development and energy evolution of stressed coal-rock combination[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2020,133:15.
APA	Zhang, Heng,Lu, Cai-Ping,Liu, Bin,Liu, Yang,Zhang, Nong,&Wang, Hong-Yu.(2020).Numerical investigation on crack development and energy evolution of stressed coal-rock combination.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,133,15.
MLA	Zhang, Heng,et al."Numerical investigation on crack development and energy evolution of stressed coal-rock combination".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 133(2020):15.