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Dynamic mechanisms of earthquake-triggered landslides
作者姓名:ZHU ShouBiao  SHI YaoLin  LU Ming  XIE FuRen
作者单位:Institute of Crustal Dynamics,China Earthquake Administration;Key Laboratory of Computational Geodynamics,Chinese Academy of Sciences
基金项目:supported by National Natural Science Foundation of China(Grant No.40974020);Special Project in Ministry of Land and Resources(Grant No.SinoProbe-07);Special Project for Basic Research on the State Level(Grant No.ZDJ2009-1)
摘    要:Earthquake-triggered landslides usually cause great disasters,and yet their dynamic mechanisms remain poorly understood.This paper will derive a general conceptual landslide model from the geometric and kinematic features of the most landslide masses triggered by the 2008 Wenchuan earthquake.Kinematic characteristics and dynamic processes are simulated here by means of finite element method(FEM)based on the dynamic process of the discontinuous deformable body.The calculated results presented the whole course of landslide motion,and displayed some typical kinematic characteristics such as initiation,sliding,ejection,collision,flying in the air,and climbing of landslides.The simulation result also shows that,under combined seismic inertial forces and gravity,landslides will start to slip once it overcomes the friction between the sliding mass and slip-bed,then it will move from slow to fast along the slippery bed until it ejects from the slip-bed.Moreover,the high frequencies and serious damages by landslides in the Wenchuan earthquake are caused by the strong ground motion on the mountain slopes in and around the epicenter that was dramatically amplified owing to both resonances produced by the seismic event and topographical amplification by seismic motion.In addition,the modeling results suggest that the direction,amplitude,frequency,and duration of strong ground motion have a great influence on the stability of landslide mass.Therefore,the study helps us better understand dynamic mechanism of landslides,seismic hazard assessment,and dynamic earthquake triggering.

关 键 词:earthquake-triggered  landslides  strong  ground  motion  dynamics  finite  element  method  Wenchuan  earthquake

Dynamic mechanisms of earthquake-triggered landslides
ZHU ShouBiao,SHI YaoLin,LU Ming,XIE FuRen.Dynamic mechanisms of earthquake-triggered landslides[J].Science China Earth Sciences,2013,56(10):1769-1779.
Authors:ShouBiao Zhu  YaoLin Shi  Ming Lu  FuRen Xie
Institution:1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China
2. Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, 100049, China
Abstract:Earthquake-triggered landslides usually cause great disasters, and yet their dynamic mechanisms remain poorly understood. This paper will derive a general conceptual landslide model from the geometric and kinematic features of the most landslide masses triggered by the 2008 Wenchuan earthquake. Kinematic characteristics and dynamic processes are simulated here by means of finite element method (FEM) based on the dynamic process of the discontinuous deformable body. The calculated results presented the whole course of landslide motion, and displayed some typical kinematic characteristics such as initiation, sliding, ejection, collision, flying in the air, and climbing of landslides. The simulation result also shows that, under combined seismic inertial forces and gravity, landslides will start to slip once it overcomes the friction between the sliding mass and slip-bed, then it will move from slow to fast along the slippery bed until it ejects from the slip-bed. Moreover, the high frequencies and serious damages by landslides in the Wenchuan earthquake are caused by the strong ground motion on the mountain slopes in and around the epicenter that was dramatically amplified owing to both resonances produced by the seismic event and topographical amplification by seismic motion. In addition, the modeling results suggest that the direction, amplitude, frequency, and duration of strong ground motion have a great influence on the stability of landslide mass. Therefore, the study helps us better understand dynamic mechanism of landslides, seismic hazard assessment, and dynamic earthquake triggering.
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