Study on Slope Instability Mechanism and Constant Resistance Large Deformation Anchor Cable Control Technology in Strongly Weathered Strata of Open-Pit Mine

To investigate the failure mechanisms of slopes and develop an integrated approach for slope reinforcement, monitoring, and early warning, the Daye open-pit copper mine slope was selected as the case study. Initially, field investigations and analyses of engineering geological conditions were performed to elucidate the deformation instability mechanisms of the slope. Subsequently, a numerical model was established to evaluate the slope reinforcement efficacy of constant resistance large deformation (CRLD) anchor cables with different anchorage lengths. The results demonstrate that increasing the anchorage length of CRLD anchor cables leads to a reduction in total slope displacement and an enhancement in the slope safety factor. The axial force distribution within the slope was segmented into three distinct zones: concentration area, transition area, and stable area. The optimal safety factor was achieved at an anchorage length of 20 m. This study provides insights into the slope deformation mechanisms, the anchorage performance of CRLD anchor cables, and their optimal anchorage lengths. Based on the findings, an integrated scheme for slope reinforcement, monitoring, and early warning is proposed. The field application results indicate significant improvements in the stability of the Daye open-pit copper mine slope.