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

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides
	Dai, F. C.3; Kwong, A. K. L.1; Tu, X. B.3; Min, H.2; Tham, L. G.1
刊名	ENGINEERING GEOLOGY
	2009
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
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研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000265998600014
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3202]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China;
推荐引用方式 GB/T 7714	Dai, F. C.,Kwong, A. K. L.,Tu, X. B.,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	Dai, F. C.,Kwong, A. K. L.,Tu, X. B.,Min, H.,&Tham, L. G..(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	Dai, F. C.,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.