Research on Slip Plane Location of Two-layer Slope Based on Strength Reduction Method

In the slope engineering, the slip plane location is closely related to the support and improvement measures. Here, the strength reduction method is applied to determine the influence factors for two-layerslip plane location,including the excavation location, soil cohesion and friction angle. The results indicate that the critical friction angle' s ratio limitwould occurwhen the cohesion values of the two layer soil are constant. While above the critical limit, the slip plane location would be totally changed from passing through the two layer soil to the upper layer soil only.Meanwhile, the critical friction angle's ratio limit would decrease with the cohesion ratio increasing, which indicates that the slope soil layer's shear strength could change the slip plane location significantly and influence the two-layer slope's stability.