Effects of high differential stress and mineral properties on deformation and failure mechanism of hard rocks

doi:10.1139/cgj-2019-0591

	Effects of high differential stress and mineral properties on deformation and failure mechanism of hard rocks
	Feng, Xia-Ting 2; Zhao, Jun 2; Wang, Zhaofeng 1; Yang, Chengxiang 2; Han, Qiang 2; Zheng, Zhi 1
刊名	CANADIAN GEOTECHNICAL JOURNAL
	2021-03-01
卷号	58 期号:3 页码:411-426
关键词	differential stress mineral properties tensile crack deformation behaviour failure modes
ISSN号	0008-3674
DOI	10.1139/cgj-2019-0591
英文摘要	To study the deformation and failure mechanism of hard rocks, true triaxial compression tests were conducted on four types of hard rocks to obtain the complete stress-strain curves and failure modes. Under true triaxial compression conditions, the shapes of the complete stress-strain curves can be divided into three types: elastic-brittle (ED), elastic-plastic-brittle (EPB), and elastic-plastic-ductile (EPD) types. According to the different post-peak deformation behaviours, the stress-strain curves of EPB type can be subdivided into three sub-categories: post-peak instantaneous brittle (EPB-I), post-peak multi-stage brittle (EPB-M), and post-peak delayed brittle (EPB-D). The stress-strain curves change from EPD to EPB-D, EPB-M, EPB-I, and finally EB with increasing differential stress (sigma(2) - sigma(3)). The deformation characteristics are dependent on intermediate principal stress sigma(2), minimum principal stress sigma(3), mineral compositions, and mineral textures of rock samples. An increase in sigma(3) leads to an increased ductility, while an increase in sigma(2) leads to an increased brittleness. Moreover, rocks with regular mineral textures and low mineral hardness are more prone to ductility. When the deformation curve is transformed from EPD to EPB and then to EB, the tensile crack gradually predominates, and the macroscopic failure angle gradually becomes steeper.
资助项目	National Natural Science Foundation of China[51839003] ; National Natural Science Foundation of China[51579043] ; National Natural Science Foundation of China[41827806]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	CANADIAN SCIENCE PUBLISHING
WOS记录号	WOS:000625879800008
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25894]
专题	中科院武汉岩土力学所
通讯作者	Feng, Xia-Ting
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Northeastern Univ, Key Lab, Minist Educ Safe Min Deep Met Mines, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Feng, Xia-Ting,Zhao, Jun,Wang, Zhaofeng,et al. Effects of high differential stress and mineral properties on deformation and failure mechanism of hard rocks[J]. CANADIAN GEOTECHNICAL JOURNAL,2021,58(3):411-426.
APA	Feng, Xia-Ting,Zhao, Jun,Wang, Zhaofeng,Yang, Chengxiang,Han, Qiang,&Zheng, Zhi.(2021).Effects of high differential stress and mineral properties on deformation and failure mechanism of hard rocks.CANADIAN GEOTECHNICAL JOURNAL,58(3),411-426.
MLA	Feng, Xia-Ting,et al."Effects of high differential stress and mineral properties on deformation and failure mechanism of hard rocks".CANADIAN GEOTECHNICAL JOURNAL 58.3(2021):411-426.