Universal confined tensile strength of intact rock

doi:10.1038/s41598-019-42698-6

	Universal confined tensile strength of intact rock
	Lan, Hengxing 1,2; Chen, Junhui 1,3; Macciotta, Renato 4
刊名	SCIENTIFIC REPORTS
	2019-04-16
卷号	9 页码:9
ISSN号	2045-2322
DOI	10.1038/s41598-019-42698-6
通讯作者	Lan, Hengxing(lanhx@igsnrr.ac.cn)
英文摘要	Strength criteria for intact rock are essential for the safe design of many engineering structures. These criteria have been derived mainly from tests in the compressive stress region. Very few results have been published for confined, direct tensile tests on intact rock. No appropriate criteria are available for addressing the issue on tensile strength of intact rock at current stage. We present the results of direct triaxial tensile tests on Longmaxi Shales under varying confining stresses. These and the results from previous tests in marble and sandstone prove that the phenomenon of "tension cut-off" at low confining stress and the positive correlations between confining stress and tensile strength above the confining stress threshold for brittle rocks occur also in more ductile rocks like shales. Such findings are consistent with the concept that tensile failure processes for intact rock are universal. Our results demonstrate that friction processes still have a significant role on intact rock strength in the tensile region which is leading to confined tensile failure and transitioning to a purely tensile mode. Further, strength criteria are presented which consider the frictional processes leading to failure under confined, direct tension tests and validated against published tensile strength data.
资助项目	National Natural Science Foundation of China[41525010] ; National Natural Science Foundation of China[41790443] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10030300] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23090301] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19040304] ; 111 project
WOS关键词	BRITTLE FAILURE ; FRACTURE ; STRESS
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE PUBLISHING GROUP
WOS记录号	WOS:000464652400041
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; 111 project
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/48171]
专题	中国科学院地理科学与资源研究所
通讯作者	Lan, Hengxing
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, 11A Datun Rd, Beijing 100101, Peoples R China 2.Changan Univ, Sch Geol Engn & Geomat, Xian 710054, Shaanxi, Peoples R China 3.Univ Chinese Acad Sci, Datun Rd 3A, Beijing 100049, Peoples R China 4.Univ Alberta, Fac Engn, Sch Engn Safety & Risk Management, 13-244 Donadeo ICE Bldg,9211-116 St, Edmonton, AB T6G 1H9, Canada
推荐引用方式 GB/T 7714	Lan, Hengxing,Chen, Junhui,Macciotta, Renato. Universal confined tensile strength of intact rock[J]. SCIENTIFIC REPORTS,2019,9:9.
APA	Lan, Hengxing,Chen, Junhui,&Macciotta, Renato.(2019).Universal confined tensile strength of intact rock.SCIENTIFIC REPORTS,9,9.
MLA	Lan, Hengxing,et al."Universal confined tensile strength of intact rock".SCIENTIFIC REPORTS 9(2019):9.