Upper Bound Limit Method for Stability Analysis of Two-Layered Soil Slope Subjected to Seismic Excitation
In order to explore the effect of earthquake on the stability of two-layered soil slope,based on the upper limit theory of limit analysis,the rotary failure mechanism of double-layer soil slope under earthquake was established.The pseudo-static method was used to simplify the seismic load,and the expression of safety factor of double soil slope was derived.The influences of soil cohesive force ratio,side slope angle and earthquake action on the stability and sliding surface parameters of double-layer soil slope were analyzed.The results showed that the slope safety factor increased nonlinearly and the potential slip surface became shallower with the increase of cohesion ratio under horizontal seismic action;when the horizontal seismic action was strengthened,the slope failure range increased significantly;with the increase of vertical seismic coefficient and cohesive force ratio,the slope safety factor decreased slightly;however,with the strengthening of horizontal seismic action,the influence of vertical seismic action on slope stability gradually increased,so it was necessary to consider the influence of vertical earthquake.
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