Selecting shear strength parameters of landslides based on quantitative analysis to deep displacement monitoring data

A method to select shear strength parameters was proposed according to the slip zone integrity index calculated through quantitative analysis of deep displacement monitoring data of landslides based on landslide peak strength and residual strength.Taking Wuchiba landslide in Three Gorges reservoir area for example,the result was inspected using limit equilibrium method and surface displacement monitoring data.The results show that the shear strength parameters of Wuchiba landslide in the chosen calculation conditions by the proposed method are as follows: the cohesion and internal friction angle of slip zone above water are 27.99 kPa andФ=17.71°,and those of slip zone under water are 20.69 kPa and Ф=11.63°,which conforms to the actual situation.