Effects of water content on the shear behavior and critical state of glacial till in Tianmo Gully of Tibet, China

doi:10.1007/s11629-019-5440-9

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Effects of water content on the shear behavior and critical state of glacial till in Tianmo Gully of Tibet, China
	Zhou, Gordon G. D.1,2 ; Chen Lei-lei 1,2; Mu Qing-yi 3; Cui, Kahlil Fredrick E.1,2; Song Dong-ri1,2
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2019-08-01
卷号	16 期号:8 页码:1743-1759
关键词	Glacial till Shear behavior Water content Dilatancy Direct shear test Critical state
ISSN号	1672-6316
DOI	10.1007/s11629-019-5440-9
通讯作者	Chen Lei-lei(llchen@imde.ac.cn)
英文摘要	Glacial tills are widely distributed in Tibet, China, and are highly susceptible to landslides under intense rainfalls. Failures of the slope during rainfall are closely related to the shear behavior of glacial tills at different moisture conditions. This study investigates the shear behavior and critical state of saturated and unsaturated glacial tills through a series of drained direct shear tests. The tests were conducted on two types of compacted glacial tills with different water contents and total normal stresses. A strain softening mode of failure is observed for all water content conditions accompanied by noticeable dilation. Dilatancy is found to decrease with increasing water content. Unsaturated samples showed increased rates of dilation as water content is decreased for all applied normal stresses a behavior which cannot be predicted well by classical stress-dilatancy models. Furthermore, it was found that the Critical State Line (CSL), plotted on the (e-ln sigma(n)) plane, can be used to define the shear behavior of unsaturated glacial tills at different water contents. The CSL of saturated glacial tills run parallel to this line. The experimental results in this study are aimed to provide a basic understanding to the underlying failure mechanisms of glacial tills.
资助项目	Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS)[QYZDB-SSW-DQC010] ; Youth Innovation Promotion Association, Chinese Academy of Sciences (CAS)
WOS关键词	STRENGTH CHARACTERISTICS ; UNSATURATED SOIL ; PLASTICITY MODEL ; SUBGLACIAL TILL ; DEBRIS FLOWS ; STRESS ; STABILITY ; LOESS ; PRECIPITATION ; COMPRESSION
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000478892900002
资助机构	Key Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Youth Innovation Promotion Association, Chinese Academy of Sciences (CAS)
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26769]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Chen Lei-lei
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Xi An Jiao Tong Univ, Dept Civil Engn, Xian 710049, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Gordon G. D.,Chen Lei-lei,Mu Qing-yi,et al. Effects of water content on the shear behavior and critical state of glacial till in Tianmo Gully of Tibet, China[J]. JOURNAL OF MOUNTAIN SCIENCE,2019,16(8):1743-1759.
APA	Zhou, Gordon G. D.,Chen Lei-lei,Mu Qing-yi,Cui, Kahlil Fredrick E.,&Song Dong-ri.(2019).Effects of water content on the shear behavior and critical state of glacial till in Tianmo Gully of Tibet, China.JOURNAL OF MOUNTAIN SCIENCE,16(8),1743-1759.
MLA	Zhou, Gordon G. D.,et al."Effects of water content on the shear behavior and critical state of glacial till in Tianmo Gully of Tibet, China".JOURNAL OF MOUNTAIN SCIENCE 16.8(2019):1743-1759.