Quantitative fracture analysis of hard rock containing double infilling flaws with a novel DIC-based method

doi:10.1016/j.engfracmech.2021.107846

	Quantitative fracture analysis of hard rock containing double infilling flaws with a novel DIC-based method
	Miao, Shuting 1,2; Pan, Peng-Zhi 1,2; Li, Shaojun 1; Chen, Jianqiang 3; Konicek, Petr 4
刊名	ENGINEERING FRACTURE MECHANICS
	2021-07-01
卷号	252 期号:-页码:35
关键词	Digital image correlation Double flaws Infilling materials Crack path Fracture mechanism
ISSN号	0013-7944
DOI	10.1016/j.engfracmech.2021.107846
英文摘要	Natural or engineering rock joints often contains different kinds of infilling materials, such as clay, sand, or cement, which may significantly affect the crack initiation, propagation, and coalescence between joints. The cracking behaviours of the jointed rock masses have not been widely studied quantitatively, especially for the crack mechanism identification. Most previous studies identified the crack mechanisms, i.e. mode I, mode II, and mixed-mode, by visual inspection of the relative opening or sliding displacement across the cracks or the roughness of the newly formed fracture surfaces, while a quantitative method has not been developed to avoid being subjective. Thus, a novel DIC-based method is proposed for quantitatively identifying the crack path and fracture mechanism of the initiated cracks in rocks. The method involves three steps, including initial displacement measurement, displacement reconstruction around the discontinuity, and crack identification and displacement jump measurement. The key challenge of the proposed method lies in the displacement reconstruction at the discontinuity with the modified subset splitting technique, whose validity is verified by the computer experiments on synthetic images. With the novel DIC-based method, the cracking behaviors of flawed marble specimens considering different flaw geometries and infilling conditions are quantitatively studied. The experimental result indicates that the crack initiation, propagation, and coalescence of flawed marble specimens are closely related to infilling conditions. The mixed-mode cracks are more likely to initiate from cement-filled and resin-filled flaws, while mode I crack is prone to initiate from unfilled and gypsum-filled flaws. Besides, the infilling significantly alters the coalescence patterns at beta = 45 degrees, while it plays a little role in crack coalescence at beta = 30 degrees and 60 degrees, mainly controlled by flaw geometry.
资助项目	State Key Research Development Program of China[2017YFC0804203] ; National Nature Science Foundation of China[51621006] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences[QYZDBSSWDQC029] ; Open Fund of the State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z018001] ; Chinese Scholarship Council
WOS研究方向	Mechanics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000677555200001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27594]
专题	中科院武汉岩土力学所
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shenhua Xinjiang Energy Co Ltd, Urumqi 830027, Peoples R China 4.Czech Acad Sci, Inst Geon, Dept Geomech & Min Res, Ostrava 70800, Czech Republic
推荐引用方式 GB/T 7714	Miao, Shuting,Pan, Peng-Zhi,Li, Shaojun,et al. Quantitative fracture analysis of hard rock containing double infilling flaws with a novel DIC-based method[J]. ENGINEERING FRACTURE MECHANICS,2021,252(-):35.
APA	Miao, Shuting,Pan, Peng-Zhi,Li, Shaojun,Chen, Jianqiang,&Konicek, Petr.(2021).Quantitative fracture analysis of hard rock containing double infilling flaws with a novel DIC-based method.ENGINEERING FRACTURE MECHANICS,252(-),35.
MLA	Miao, Shuting,et al."Quantitative fracture analysis of hard rock containing double infilling flaws with a novel DIC-based method".ENGINEERING FRACTURE MECHANICS 252.-(2021):35.