86 An Interface Model to Predict the Stability of Landslide with Weak Intercalated Layer

The landslide always consists of a lot of weak intercalated layers; the distribution and seepage-stress coupled effect of weak intercalated layer are the key factors affecting the landslide stability. In order to predict the stability correctly and mitigate disaster maximally, a new type of seepage-stress coupled interface model based on Goodman joint was proposed, which is based on Biot's consolidation theory and interpenetration control method proposed by Desai. An elastic visco-plastic constitutive model was adopted to simulate creep behavior, and a relevant FE program was developed to analyze the Dayeping landslide with weak intercalated layers, whose stability is attached important to the construction of Linxihe hydropower station. The calculated groundwater free surface is consistent well with the in-situ testing data, and the displacements and stresses suggest that the landslide may slide along with the weak intercalated layer from the elevation of 230m to 370m, especially when the water table in the downstream falls suddenly. The results provide theoretical bases for landslide disaster forecast, prevention and construction decision of Linxihe hydropower station. The proposed interface model can predict the stability of landslide with weak intercalated layer correctly.