The formation of the Wulipo landslide and the resulting debris flow in Dujiangyan City, China

The formation of the Wulipo landslide and the resulting debris flow in Dujiangyan City, China

CHEN Xing-zhang;CUI Yi-fei

【期刊名称】《山地科学学报（英文版）》 【年(卷),期】2017(014)006

【摘要】The Wulipo landslide,triggered by heavy rainfall on July 10,2013,transformed into debris flow,resulted in the destruction of 12 houses,44 deaths,and 117 missing.Our systematic investigation has led to the following results and to a new understanding about the formation and evolution process of this hazard.The fundamental factors of the formation of the landslide are a high-steep free surface at the front of the slide mass and the sandstone-mudstone mixed stratum structure of the slope.The inducing factor of the landslide is hydrostatic and hydrodynamic pressure change caused by heavy continuous rainfall.The geological mechanical model of the landslide can be summarized as \slide tension fracture collapse\and the formation mechanism as \landslide induced by heavy rainfall\total volume of the landslide is 124.6×104 m3,and 16.3％ of the sliding mass was dropped down from the cliff and transformed into debris flow during the sliding process,which enlarged 46.7％ of the original sliding deposit area.The final accumulation area is found to be 9.2×104 m2.The hazard is a typical example of a disaster