ABSTRACT
The reduction of the shear resistance along the slip surface during the earthquake may be one of the main causes for the induction of a long distance traveling failure. Many landslides in mountain area occurred during 2004 Mid Niigata Prefecture Earthquake in Japan. This chapter discusses numerical simulations for the collapse of a dip slope by the 2-D dynamic elasto-plastic finite element method. The surface soil at the foot of the slope was assumed to be sand and gravel spreading down to the Shinano. The basic concept of the elasto-plastic model is the same as the cyclic loading model originally proposed by Wakai and Ugai. The long sliding distance of the slope failure was reproduced through the elasto-plastic dynamic finite element analysis taking the cyclic shear properties of the sand into consideration.
