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	Stress relaxation characteristics of warm frozen clay under triaxial conditions
	Wang, Songhe; Qi, Jilin; Yao, Xiaoliang
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2011-10-01
卷号	69期号:1页码:112-117
关键词	Stress relaxation Warm frozen clay Triaxial test Critical relaxation duration Relaxation rate
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2011.06.015
通讯作者	Qi, Jilin(qijilin@lzb.ac.cn)
英文摘要	Stress relaxation is one of the main concerns in geotechnical engineering, especially in permafrost regions with warm frozen soil. This paper investigated the mechanical behaviors of a warm frozen soil during relaxation process. A series of triaxial relaxation tests were carried out on the warm frozen soil samples under the temperature from -1.0 degrees C to -0.2 degrees C and confining pressure of 0.5 MPa to 3.0 MPa. Three stages were observed during the whole stress relaxation process, i.e. instantaneous relaxation, intense relaxation and slow relaxation. Relationship between deviatoric stress and time was described by a hyperbolic relationship. With relatively small pre-strain (3% and 4%), volumetric changes during stress relaxation contracted initially followed by expansion, but contraction dominates the relaxation process with the magnitude of pre-strain over 6%. Characteristic parameters such as the instantaneous stress relaxation, the critical relaxation duration and relaxation rate are defined and analyzed. It is found that the parameters are all dependent on soil temperature, confining pressure and magnitude of pre-strain. (C) 2011 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000296311100012
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556518
专题	寒区旱区环境与工程研究所
通讯作者	Qi, Jilin
作者单位	Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Songhe,Qi, Jilin,Yao, Xiaoliang. Stress relaxation characteristics of warm frozen clay under triaxial conditions[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2011,69(1):112-117.
APA	Wang, Songhe,Qi, Jilin,&Yao, Xiaoliang.(2011).Stress relaxation characteristics of warm frozen clay under triaxial conditions.COLD REGIONS SCIENCE AND TECHNOLOGY,69(1),112-117.
MLA	Wang, Songhe,et al."Stress relaxation characteristics of warm frozen clay under triaxial conditions".COLD REGIONS SCIENCE AND TECHNOLOGY 69.1(2011):112-117.

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