Model testing on rainfall-induced landslide of loose soil in Wenchuan earthquake region

被引：28
作者：
Fang, H. [1 ,2 ]
Cui, P. [1 ]
Pei, L. Z. [1 ,2 ]
Zhou, X. J. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES | 2012年 / 12卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DEBRIS FLOWS; PRESSURE; LIQUEFACTION;
D O I：
10.5194/nhess-12-527-2012
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
This study investigates the formation process of rainfall-induced landslide for slopes composed of loose soil in the Wenchuan earthquake region. Experimental investigations have been performed on the landslide's formation and the variation of the controlling soil parameters under various artificial rainfall conditions. The landslide triggering mechanisms can be described in the following way. Firstly, the large porosity of the loose soil facilitated the infiltration of water, which increased the pore water pressure and reduced the shear strength of the soil significantly. In addition, the rainfalls probably caused the concentration of finer particles at a certain depth of the valley slopes. This concentration within the soil increased the pore water pressure significantly, and consequently reduced both the porosity ratio and permeability. Therefore, when the pore water pressure reached a critical state, the effective shear strength of the soil diminished, inducing the landslide's formation.
引用
收藏
页码：527 / 533
页数：7
相关论文
共 26 条
[1]  
[Anonymous], INFLUENCE EARTHQUAKE
[2]  
Casagrande A., 1976, HARVARD SOIL MECH SE, V88
[3]  
Castro G., 1969, LIQUEFACTION SANDS
[4]  
Chen X. Q., 2006, CHINESE J ROCK MECH, V251, P106
[5]  
Cui P., 2009, J NAT HAZARDS, DOI [10.1007/s11069-009-9392-1, DOI 10.1007/S11069-009-9392-1]
[6]  
Cui P, 1992, J CHINESE SCI B, V379, P759
[7]  
Cui Peng, 2010, Journal of Sichuan University, V42, P10
[8]  
Fredlund D. G., 1997, Soil Mechanics for Unsaturated Soils
[9]   The mobilization of debris flows from shallow landslides [J].
Gabet, EJ ;
Mudd, SM .
GEOMORPHOLOGY, 2006, 74 (1-4) :207-218
[10]   Pore-water pressure of debris flows [J].
Hotta, N ;
Ohta, T .
PHYSICS AND CHEMISTRY OF THE EARTH PART B-HYDROLOGY OCEANS AND ATMOSPHERE, 2000, 25 (04) :381-385
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