Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates

doi:10.3390/en14206616

	Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates
	Zhong, Kun 1,2; Zhao, Wusheng 2; Qin, Changkun 1,2; Chen, Weizhong 2
刊名	ENERGIES
	2021-10-01
卷号	14 期号:20 页码:15
关键词	strain rates bedding planes energy density failure deformation field rock burst
DOI	10.3390/en14206616
英文摘要	The study of the mechanical properties and failure behaviors for coal with different bedding structures at various medium strain rates is of great importance for revealing the mechanism of rock burst. In our study, we systematically analyze the uniaxial compressive strength (UCS), acoustic emission (AE) characteristics, failure pattern, and risk of rock burst on coal specimens with two bedding orientations under ranged in strain rates from 10(-4) s(-1) to 10(-2) s(-1). The results reflect that and the bedding direction and the strain rates significantly affect the UCS and failure modes of coal specimens. The UCS of coal specimens with loading directions perpendicular to bedding planes (horizontal bedding) increases logarithmically with increasing strain rate while the UCS increases first and then decreases of coal specimens with loading directions parallel to bedding planes (vertical bedding). The AE cumulative energy of the specimens with horizontal bedding is an order of magnitude higher than that of specimens with vertical bedding. However, it is independent of the strain rates. The energy release rates of these two types of bedded coal specimens increase in a power function as the strain rate increases. The coal specimens with horizontal bedding show violent failure followed by the ejection of fragments, indicating a high risk of rock burst. On the other hand, the coal specimens with vertical bedding exhibit a tensile splitting failure with a low risk of rock burst. Strain localization is a precursor of coal failure, and the concentration area of local principal strain is highly consistent with the initial damage area, and the area where the principal strain gradient is significantly increased corresponds to the fracture initiation area.
资助项目	National Natural Science Foundation of China[51991393] ; National Natural Science Foundation of China[52079134]
WOS研究方向	Energy & Fuels
语种	英语
出版者	MDPI
WOS记录号	WOS:000715483700001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28362]
专题	中科院武汉岩土力学所
通讯作者	Zhao, Wusheng
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Zhong, Kun,Zhao, Wusheng,Qin, Changkun,et al. Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates[J]. ENERGIES,2021,14(20):15.
APA	Zhong, Kun,Zhao, Wusheng,Qin, Changkun,&Chen, Weizhong.(2021).Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates.ENERGIES,14(20),15.
MLA	Zhong, Kun,et al."Experimental Study on the Mechanical Behavior and Failure Characteristics of Layered Coal at Medium Strain Rates".ENERGIES 14.20(2021):15.