Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides

doi:10.1016/j.enggeo.2008.11.011

	Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides
	Tu, X. B.2; Kwong, A. K. L.1; Dai, F. C.2; Tham, L. G.1; Min, H.3
刊名	ENGINEERING GEOLOGY
	2009-04-23
卷号	105 期号:1-2 页码:134-150
关键词	Loess slope Artificial rainfall Field monitoring Unsaturated soil Infiltration Wetting front
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2008.11.011
文献子类	Article
英文摘要	A full-scale field experiment involving artificial rainfall has been conducted in an instrumented loess cut slope in an expressway in a loess plateau, Northwest China. Instrumentations including soil moisture probes, tensiometers, piezometers, vacuum sensors, water level sensors, and rain gauge were installed in the slope. After monitoring for about 2 years, artificial rainfall was induced at the site in April 2007. This paper presents the results from soil moisture probes, tensiometers, and water levels to reveal the surface infiltration process in an unsaturated soil. The results show that the top 0.7 m in loess is an active zone under the process of infiltration and evaporation, when subjected to a maximum rainfall intensity of 40 mm/day. The depth of the wetting front" during the wet season was limited to the top 2 m of soil. During high rainfall intensity of 120 mm/day, the depth of the "wetting front" is about 3 m. Based on the variation of volumetric water content and matric suction in soil, a method to analyze the rainfall infiltration is proposed. By means of Gravity-Predominant Flow (GPF) concept, the infiltration rate is analyzed in the deeper soil. The results explain well the observations that loess slopes could be stable in the wet season, but it may tend to slide about 3-6 months later in the dry season. The surface infiltration has a very limited effect on the permanent groundwater table, which is at a greater depth. (C) 2008 Elsevier B.V. All rights reserved.
WOS关键词	UNSATURATED SOIL SLOPES ; HYDRAULIC CONDUCTIVITY ; MATRIC SUCTION ; STABILITY ; MODEL ; PREDICTION ; INSTABILITY ; THRESHOLDS ; PARAMETERS ; MOISTURE
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000265998600014
资助机构	Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; Research Grants Council(HKU 7176/05E ; HKU 713807E) ; HKU 713807E) ; HKU 713807E) ; HKU 713807E)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/70570]
专题	中国科学院地质与地球物理研究所
通讯作者	Kwong, A. K. L.
作者单位	1.Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Tu, X. B.,Kwong, A. K. L.,Dai, F. C.,et al. Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides[J]. ENGINEERING GEOLOGY,2009,105(1-2):134-150.
APA	Tu, X. B.,Kwong, A. K. L.,Dai, F. C.,Tham, L. G.,&Min, H..(2009).Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides.ENGINEERING GEOLOGY,105(1-2),134-150.
MLA	Tu, X. B.,et al."Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides".ENGINEERING GEOLOGY 105.1-2(2009):134-150.