Mechanical Properties of Roof Rocks under Superimposed Static and Dynamic Loads with Medium Strain Rates in Coal Mines

doi:10.3390/app11198973

	Mechanical Properties of Roof Rocks under Superimposed Static and Dynamic Loads with Medium Strain Rates in Coal Mines
	Zhong, Kun 1,2; Zhao, Wusheng 2; Qin, Changkun 1,2; Gao, Hou 1,2; Chen, Weizhong 2
刊名	APPLIED SCIENCES-BASEL
	2021-10-01
卷号	11 期号:19 页码:19
关键词	static pre-stress dynamic loading rate strength failure mode energy density principal strain field rock bursts
DOI	10.3390/app11198973
英文摘要	Roof rocks in coal mines are subjected to the combination of in situ stresses and dynamic stresses induced by mining activities. Understanding the mechanical properties of roof rocks under static and dynamic loads at medium strain rates is of great significance to revealing the mechanism of rock bursts. In this study, we employ the digital image correlation (DIC) technique to investigate the energy concentration and dissipation behaviors, failure mode, and deformation characteristics of roof rocks under combined static and dynamic loads. Our results show that both the static pre-stress and dynamic loading rate have significant effects on the uniaxial compressive strength of rock specimens. From the energy principle, when the static pre-stress is the same, both elastic strain energy density and dissipated energy density increase with increasing dynamic loading rate. The hazard of rock bursts increases with decreasing static pre-stress and increasing dynamic loading rate. At higher dynamic loading rates, more cracks are generated, and the failure becomes more violent. The crack initiation, propagation and coalescence processes are identified, and the failure mode is closely related to the evolution of the global principal strain field of the rock specimens.
资助项目	National Natural Science Foundation of China[52079134]
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000708164900001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28502]
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. Mechanical Properties of Roof Rocks under Superimposed Static and Dynamic Loads with Medium Strain Rates in Coal Mines[J]. APPLIED SCIENCES-BASEL,2021,11(19):19.
APA	Zhong, Kun,Zhao, Wusheng,Qin, Changkun,Gao, Hou,&Chen, Weizhong.(2021).Mechanical Properties of Roof Rocks under Superimposed Static and Dynamic Loads with Medium Strain Rates in Coal Mines.APPLIED SCIENCES-BASEL,11(19),19.
MLA	Zhong, Kun,et al."Mechanical Properties of Roof Rocks under Superimposed Static and Dynamic Loads with Medium Strain Rates in Coal Mines".APPLIED SCIENCES-BASEL 11.19(2021):19.