含断层露天矿边坡分段开挖稳定性动态演化与控制OA

To clarify the dynamic evolution law of slope stability during the graded excavation to the designed slope angle in an open-pit mine,this article takes Jilangde Open-pit Mine as research background,uses MIDAS GTS-NX software to carry out numerical simulations for each excavation stage of a synclinal slope containing faults with a designed slope angle of 30°,proposes a dynamic stability analysis method based on 18 mining stages,reveals the mechanism of slope sliding induced by multi-stage mining.The results indicate that the stages 6 to 9 represent a stability-sensitive period,during which the safety factor decreases by 56%of the total reduction throughout the entire process.Moreover,the fine sandstone layer beneath coal seam B5 is identified as the key stratum controlling slope deformation.Based on these findings,the article proposes a graded prevention and control system combining"monitoring and early warning—structural reinforcement".