Experimental and numerical study on crack propagation and coalescence in rock-like materials under compression

doi:10.1177/0309324720986913

	Experimental and numerical study on crack propagation and coalescence in rock-like materials under compression
	Li, Xiaojing 1,2; Bai, Yifan 2; Chen, Xudong 4; Zhao, Xinning 3; Lv, Mingying 2
刊名	JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
	2021-01-11
页码	15
关键词	Brittle sandstone material theory of particle flow cross flaws crack initiation crack propagation
ISSN号	0309-3247
DOI	10.1177/0309324720986913
英文摘要	The discontinuous crack surface in a rock affects the stability of the whole rock system. The experiments in this paper were carried out by prefabricating rock-like specimens with different types of flaws, then the specimens were tested under uniaxial compression. Moreover, based on the theory of particle flow, PFC2D software was used for numerical simulation, and the comparative analysis of the experimental and simulative results was carried out to obtain the crack initiation sequence, propagation phenomenon, and failure mode of rock specimens with different flaw types. The results indicated that the wing crack started at the tip of flaw and the form of crack assumed split failure, followed by shear failure caused by the secondary crack. The tensile failure degree decreases and the influence of shear failure increases with the increase of flaw angle. The wing crack and secondary initiation stress value is 35%-55% and 85%-95% of the peak stress value. Crack coalescence appeared in adjacent flaws of rock-like specimens with multiple parallel single flaws, single-cross flaws and double-cross flaws, and the coalescence phenomenon always occurs when the stress peak value is reached. With the number of flaws increasing, the splitting failure of rock-like specimens became more and more serious, the splitting failure of double cross-flaw specimen is the most serious. As for the specimen with single-cross flaw, the wing crack would be produced at the tip of the flaw with larger obliquity. The results of this paper may offer certain reference value for the study on the mechanism of rock crack.
资助项目	National Natural Science Foundation of China[51979156] ; National Natural Science Foundation of China[51779134] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z018006] ; Youth Innovation Technology Project of Higher School in Shandong Province[2019KJG015]
WOS研究方向	Engineering ; Mechanics ; Materials Science
语种	英语
出版者	SAGE PUBLICATIONS LTD
WOS记录号	WOS:000635311000001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25912]
专题	中科院武汉岩土力学所
通讯作者	Li, Xiaojing
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China 2.Shandong Jianzhu Univ, Sch Civil Engn, Jinan 250101, Shandong, Peoples R China 3.Jinan Civil Def Construct Design Res Inst Co Ltd, Jinan, Shandong, Peoples R China 4.Hohai Univ, Sch Civil Engn & Transportat, Nanjing, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaojing,Bai, Yifan,Chen, Xudong,et al. Experimental and numerical study on crack propagation and coalescence in rock-like materials under compression[J]. JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN,2021:15.
APA	Li, Xiaojing,Bai, Yifan,Chen, Xudong,Zhao, Xinning,&Lv, Mingying.(2021).Experimental and numerical study on crack propagation and coalescence in rock-like materials under compression.JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN,15.
MLA	Li, Xiaojing,et al."Experimental and numerical study on crack propagation and coalescence in rock-like materials under compression".JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN (2021):15.