Journal
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
Volume 12, Issue 3, Pages 527-533Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/nhess-12-527-2012
Keywords
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Funding
- National Basic Research Program(973) project [2011CB409902]
- National Natural Science Foundation of China [40801009]
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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.
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