Abstract:

The persistent heavy rain triggered Wulipo landslides in Sanxi Village, Dujiangyan, Sichuan Province in July 10, 2013. The features of landslide include big difference of elevation, fast speed of sliding, long run-out distance, large volume, heavy casualties and so on. Landslide overall shows an inverted “J” shape; and it can be divided into the upper slide source region, central slipstream and lower accumulation area. The upper stratum of landslide is Cretaceous Guankou Formation red siltstone and mudstone; the lower is massive conglomerate including mudstone weak surface; the landslide’s ramp structure is forward slope. Fragile geological environment including terrain steep ness, rock crushing, earthquake, with human engineering activities and continued heavy rainfall together, led to the major geological disasters; continuous 48 h of 544 mm rainfall is the direct cause of Wulipo landslide. The disaster mode is earthquake crack→bedrock collapse and slide→loading and instability→slipstream and pushing→accumulation and stopped-flow.

Key words: hazard characteristic, landslide, disaster mode, Wulipo, Dujiangyan