Abstract:In order to study the effect of through-fault (F1) and historical mined-out roadway on the slope stability of an open-pit mine in Guangdong. In this paper, rock mass quality evaluation indexes of different rock groups were obtained based on field engineering investigation, rock mass parameters were obtained by the Hoek-Brown strength criterion and engineering analogy method, and a three-dimensional geological model of roadway containing penetrating faults and the historical mined-out roadway was established combining with actual working conditions for comprehensive slope stability analysis. The results show that on 154 m and 197 m levels, the displacement at the top and surface of the slope is small, the tensile stress is less than the tensile strength of the rock mass, and the plastic zone fails to connect from top to bottom. The tensile stress value of the through-fault (F1) in the mining area on the slope is smaller than that of the tensile strength of the fully weathered rock mass. The maximum displacement is only at the top and bottom of the slope, and the vertical displacement is 1.4 mm. No through-fault occurs in the plastic zone near the through-fault. Combined with the above analysis, the through-fault and the historically mined-out roadway have little influence on the stability of the slope in the natural state, which lays a foundation for the safe production of the mine.