Abstract: To investigate the deformation characteristics of a highway landslides in the mountain area induced by multiple factors, the DEM numerical method with the advantages of simulating large deformation and failure process was established. The rainfall and earthquake induced effects were characterized by the strength reduction and application of full course seismic time history. The deformation process of the Yanyang Village landslide located in the highway from Shangri-La to Lijiang was also simulated. The deformation characteristics were analyzed under the condition of rainfall and earthquake. The results demonstrate that there are no signs of large-scale deformation failure and deep-seated sliding presented at the Yanyang Village landslide, except for the local and surficial deformation, which are in good agreement with the actual deformation features observed. The deformation is more concentrated and larger under the condition of rainfall than that under the condition of earthquake. The numerical results not only can be used to provide the theoretical support for the Yanyang Village landslide, and also can be used to provide a reference for landslides with the similar geological conditions.

Key words: Yanyang Village Landslide, Deformation Characteristics, Discrete Element Method, Multiple Factors