STABILITY ANALYSIS OF SLOPE BASED ON DYNAMIC AND WHOLE STRENGTH REDUCTION METHODS

Slope stability evaluation based on strength reduction can only obtain static single safety factor. The dynamic evaluation method of slope stability is proposed based on dynamic and whole strength reduction methods in order to obtain the slope stability in the progressive failure process. At first,a series of expanded sliding surfaces are searched by using the dynamic strength reduction method(DSRM);and then the strength parameters of the sliding surface are reduced in each reduction step. The corresponding safety factor of the slope is calculated by using whole strength reduction calculation. At last,the relationship of sliding surface propagation and the related safety factor is analyzed. Therefore,slope stability evaluation and support suggestion can be given according to the change rule of dynamic safety factors of slope. Two case studies show that sliding surface obtained by DSRM is consistent with in-situ monitoring data,reasonably reflecting the failure characteristics of slope or landslide. A series of dynamic safety factors are presented in the progressive failure process by using the advantages of DSRM and whole strength reduction method respectively. The DSRM benefits stability judgment and supporting measures suggestion of slope. Compared with the limit equilibrium method,the DSRM is more suitable for stability evaluation of the heterogeneous slopes;and it can search the potential sliding surface accurately.