Stability Analysis of an Intense Weathered Rock Slope and Optimum Reinforcement Design

Abstract

Based on the complex stratigraphic characteristics of the Chengmenshan copper mine slope, the stability should be analyzed and additional reinforcement measures need to be implemented to ensure safety in production. In this paper, the stability of the slope was analyzed with numerical simulation model under nature and dynamic loading state. According to the analysis results, the design of orthogonal experiment was discussed for the key factors which influence the reinforcement effect of anchors with SPSS software, and the master-subordinate relationship of the factors and optimal combination were obtained by using range analysis method. Finally, the slope stability with optimal reinforcement measure was tested. The results show that the safety factor of slope under nature state is low and it is in the critical instability condition. Under dynamic loading state, the failure probability of slope increases from 0 to 18% as the seismic magnitude varies from 6 to 8. Primary and secondary sequence of factors that influence the anchor reinforcement effect is the bonding length, anchor installing angle, anchor length at 3rd bench, anchor length at 2nd bench and anchor length at 1st bench. The safety factor of slope reinforced with anchors is larger than 1.1, which could ensure the safety and stability of the slope.