CALCULATION METHOD OF LANDSLIDE RESIDUAL SLIDING FORCE USING SIMPLIFIED BISHOP METHOD

It is agreed that the simplified Bishop method is "strictly", easy, accurate for the use of the slip circle in the stability analysis of slopes. Some scholars studied its stringency. but There is no corresponding calculation of landslide residual sliding force. So, it is difficult for the comprehensive control of landslide and slope stability. In this paper, the two analysis models of residual sliding force are obtained using simplified Bishop Method. They are the model Ⅰ for T_i ≥ 0 and the model Ⅱ for T_i < 0. They consider the weight of the slope body, the external force, the horizontal seismic force, and the pore water pressure of sliding surface. They use the laws of force polygon. Sliding thrusts of the slice i about the two models above are deduced respectively. Then, using the calculated sliding thrust of the slice i-1 to calculate the sliding thrust of slice i. The calculation of landslide residual sliding force of slice i can easily be deduced from working the way downward. The results of the analytic method are compared with the results of the transfer coefficient calculation in residual sliding force. It is concluded that the values of solved residual sliding force based on the analytic method is higher than those based on the transfer coefficient calculation in general. The difference of the two landslide residual sliding forces above decreases with the increase of safety factor. Moreover, this method is applicable to landslide and slope stability and has higher safety factor. The present work provides a theoretical basis for the control of landslides of sliding circular.