Numerical Simulation of Rainfall‐induced Xianchi Reservoir Landslide in Yunyang, Chongqing, China

Abstract

AbstractA calamitous landslide happened at 22:00 on September 1, 2014, in the Yunyang area of Chongqing City, southwest China, forcing 508 people death and 23 buildings damage. The landslide volume includes 1.44 million m3 of material in the source area and 0.4 million m3 of shoveled material. The debris flow's runout extended 400 meters vertically and 1600 meters horizontally. The researched results are listed as follow: (1) the Xianchi reservoir landslide is investigated in detail; (2) the samples collected from the main body of landslide are carried out by GCTS ring shear apparatus, and the parameters of shear and pore water pressure are measured; (3) the post‐failure characteristics of landslide are analyzed by using the numerical simulation method. It is considered that the excess pore water pressure and erosion in the motion path are the key reasons for the long‐runout motion and scale‐up of landslides caused by the heavy rainfall. The aim of this paper is to acquired numerical parameters and the basic resistance model, which is beneficial to improve simulation accuracy for hazard assessment similar to potential hillslopes in Southwest China.