Numerical simulation analysis of excavation response of counter-tilt rock slope

Abstract

With the development of the rock mass joints and the increase in the excavation depth of the slope, the failure of the anti-dipping rock slope has occurred from time to time, which has attracted the attention of scholars. Taking a proposed highway cutting slope as the research object, establish a finite element model for the excavation of a high anti-dipping rock slope. The strength reduction method is used to calculate the safety factor of the slope, stability and excavation response are also analyzed. The results show that the horizontal displacement of the rock mass caused by excavation is small, the vertical displacement is mainly concentrated near the excavation area of the slope, and the upward unloading rebound is mainly; As the excavation progresses, the maximum shear strain develops from the silty clay and strongly weathered sandy mudstone in the shallow ground to the slope toe. In the actual construction process, it is recommended to pay attention to the failure of the rock mass at the step slope toe. The safety factor of the slope gradually decreases as the excavation progresses. When the first-level slope is excavated, it is still in a stable state. The research results can provide a reference for anti-dipping slopes with similar characteristics.