Stability Analysis and Application of Two-Stage Support on The High Fill Slope

This paper relies on the two-stage slope project, which is in Sanmenxia. The first grade slope is reinforced by soil nailing, multi-row piles and buttress retaining wall support scheme are adopted for the second stage subsequent fill slope, finite element simulation software is used, a numerical analysis model for multi-stage support slope is established, the development and change of soil nail axial force, pile axial force, pile shear force and bending moment as well as slope displacement and overall stability safety coefficient of multi-grade slope during layered construction process are simulated and analyzed. The results show that the horizontal load formed by the layered filling soil of the second grade slope makes the pile produce bending moment and shear force and the soil nail produce axial force. The vertical load formed by the filling soil makes the plastic area of the slope develop into the deep part of the soil, slip surface is formed around the soil nailing and multi-row pile supporting area, finally. It is proved that it is reasonable and feasible to adopt soil nail reinforcement and multi-row pile and supporting wall joint support scheme for multi-grade slope respectively, slope is stable as a whole.