Abstract
The 2008 Wenchuan earthquake triggered many rapid and long runout landslides, which directly caused great loss of property and human lives and were responsible for a large percentage of total damages. For landslide disaster mitigation, it is very important to understand the initiation and motion mechanism of the rapid and long runout landslides, which can potentially be the deadliest of ground failures. In this paper, results of field investigation and ring shear tests simulating the initiation and motion of the Donghekou landslide is presented. It is found that groundwater caused great drop-down of the shear resistance during the initiation and rapid motion of this landslide when it was triggered by the great earthquake.
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