Laboratory study on soil behavior in loess slope subjected to infiltration

doi:10.1016/j.enggeo.2014.09.010

	Laboratory study on soil behavior in loess slope subjected to infiltration
	Zhou, Y. F.1,2; Tham, L. G.2; Yan, W. M.2; Dai, F. C.3; Xu, L.3
刊名	ENGINEERING GEOLOGY
	2014-12-09
卷号	183 页码:31-38
关键词	Landslide Infiltration Loess Unsaturated soil Stress path Constant load
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2014.09.010
文献子类	Article
英文摘要	In recent years, Heifangtai Plateau in Gansu Province, China, has received significant attention as a loess region in which landslides frequently occur. This study aims to examine the soil behavior and failure mechanism(s) of loess slopes subjected to water infiltration. High-quality samples were retrieved behind the failure plane of a landslide in Heifangtai. Three sets of stress path tests were conducted to mimic the process of loess slope failures; these tests include undrained compression on anisotropically consolidated saturated samples, drained shear by decreasing mean effective stress at constant axial load on saturated samples, and wetting by decreasing matric suction at constant axial load on unsaturated samples. Loess behavior was evaluated in terms of shear strength, deformation upon shearing, critical state, state parameter, and soil water characteristic curve. Three major observations were drawn from the test results. First the anisotropically consolidated saturated loess exhibits a noticeable strain-softening behavior upon undrained compression. The peak shear strength is mobilized at less than 1% axial strain. The ultimate shear strength is only 20-30% of the peak value. Second, when subjected to shear by decreasing mean effective stress at constant axial load, the saturated loess exhibits sudden failure when the confining stress is low. At higher stresses, the soil exhibits progressive failure. Third, unsaturated loess deforms progressively when subjected to a reduction in matric suction (i.e., wetting) at constant axial load. The failure mechanisms of the loess slopes are discussed based on the experimental findings. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	WATER CHARACTERISTICS ; SHEAR-STRENGTH ; GRANULAR SOILS ; IRRIGATION ; LANDSLIDES ; STABILITY ; CURVE ; CHINA ; INSTABILITY ; FAILURES
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000347591200003
资助机构	Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; HKUST9/CRF/09 ; HKUST9/CRF/09 ; HKUST6/CRF/12R) ; HKUST6/CRF/12R) ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; HKUST9/CRF/09 ; HKUST9/CRF/09 ; HKUST6/CRF/12R) ; HKUST6/CRF/12R) ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; HKUST9/CRF/09 ; HKUST9/CRF/09 ; HKUST6/CRF/12R) ; HKUST6/CRF/12R) ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; Research Grants Council of the Hong Kong Special Administrative Region(HKU7140/08E ; HKUST9/CRF/09 ; HKUST9/CRF/09 ; HKUST6/CRF/12R) ; HKUST6/CRF/12R)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86394]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhou, Y. F.
作者单位	1.Minist Water Resources, Changjiang River Sci Res Inst, Key Lab Geotech Mech & Engn, Wuhan 430010, Peoples R China 2.Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Y. F.,Tham, L. G.,Yan, W. M.,et al. Laboratory study on soil behavior in loess slope subjected to infiltration[J]. ENGINEERING GEOLOGY,2014,183:31-38.
APA	Zhou, Y. F.,Tham, L. G.,Yan, W. M.,Dai, F. C.,&Xu, L..(2014).Laboratory study on soil behavior in loess slope subjected to infiltration.ENGINEERING GEOLOGY,183,31-38.
MLA	Zhou, Y. F.,et al."Laboratory study on soil behavior in loess slope subjected to infiltration".ENGINEERING GEOLOGY 183(2014):31-38.