Instability failure criterion of debris landslide in the Three Gorges Reservoir Area based on the sliding zone integrity index

Abstract

The stability evaluation of landslide is one of the key issues in the field of landslide prevention and control. The research on the landslide failure criterion can provide the support for the stability evaluation of landslides. In order to enhance the accuracy of landslide stability evaluation, the landslide failure criterion based on the monitoring data of deep displacement is an effective approach. Therefore, based on the deep displacement monitoring data of landslide, the sliding zone integrity index is introduced, and a directly proportional relationship between the integrity index of the sliding zone and the shear strength parameters of the landslide is deduced. By using the calculation method of landslide stability and the simplified model of debris landslide, a directly proportional relationship between the integrity index of the sliding zone and the stability coefficient of the landslide can be obtained. The instability failure criterion of the debris landslide in the Three Gorges Reservoir Area considering the integrity index of the sliding zone is established accordingly. In the case of the integrity index of the sliding zone is greater than the critical value, the landslide is in a stable state. Otherwise, in the case of the integrity index of the sliding zone is less than the critical value, the landslide is unstable. A typical debris landslide e.g. Wuchiba landslide in the Three Gorges Reservoir Area is analyzed in detailed as an example.It is found that the failure criterion is reliable and applicable for the Wuchiba landslide. The results show that the failure criterion of slip zone integrity index can be used to evaluate the stability of landslide, which can provide a new approach for the study of landslide failure criterion.

Keywords

• three gorges reservoir area
• debris landslide
• sliding zone integrity index
• instability failure criterion