Stability analysis of heterogeneous slope with concealed fault zone

Abstract

Combined with the heterogeneous slope of the concealed fault zone at the dam site of a hydropower station in Nujiang River, a numerical analysis model is established by FLAC3D to study the influence of the content of fault gouge and fault breccia in the concealed fault zone on the stability of the slope. The results show that the safety factor increases linearly with the increase of internal friction angle when the cohesion is fixed, and linearly with the increase of cohesion when the internal friction angle is fixed. The variation of safety factor of internal friction angle is greater than that of cohesion. If the content of fault breccia is high, the safety factor is high. If the content of fault gouge is high, the safety factor is low.Comprehensive safety factor of concealed fault zone of local strength reduction method is basically consistent with that of FLAC3D concealed fault zone, and the heterogeneous slope is basically in a stable state.