Abstract:Wenchuan Earthquake induced thousands of rock fall and collapses

with some unique kinetic characteristics of geohazard. In order to study the genetic mechanism of the geohazards induced by strong earthquake

the influence of the factors such as the direction of the seismic force

texture of the slope

shape characteristics of slopes

on the slope’ failure and discussed the main model and process of the slope’failure under strong earthquake were investigated

by the means of shakding table model test of physical modeling. The results showed that strong inertia force formed in the process of earthquake is the main reason of the slope’s distortion and failure. The strong horizontal seismic inertia force brought vertical tensional cracks which strike perpendicular to the direction of the seismic force on the top of the slope firstly. At the same time

it drived the plasmodium on the out side of the crack move along the horizontal direction

brought the tensional and shearing texture face or slip face which is horizontal or incline outside.At last the slope failed along this face.The lithology of slope and the characteristic combination of lithology

the characteristic combination of the control texture faces are the main factor of the model of slope’s distortion and failure under the strong earthquake.