大西沟铁矿边坡稳定性数值模拟研究

Numerical simulation study on the slope stability at Daxigou Iron Mine

基于现场工程地质调查与室内岩石物理力学试验数据,对大西沟铁矿边坡岩体质量进行评价,确定了岩体的物理力学参数。采用数值模拟方法,对露天矿不同开采阶段的边坡应力、位移、滑移带及安全系数进行了分析,研究结果表明:边坡安全系数随台阶高度下降不断降低;自然条件下,边坡开挖不同阶段安全系数均在1.8以上,边坡稳定性较好。降雨对边坡的稳定性影响显著,饱和状态下终了边坡的安全系数降至1.36,但高于GB 51016—2014《非煤露天矿边坡工程技术规范》规定的安全系数(1.25~1.20),说明矿山采场边坡设计参数合理。研究结果可为矿山后续安全设施设计提供参考依据。

Based on field geological surveys and laboratory rock physical and mechanical test data,the rock mass quality of the slope at Daxigou Iron Mine was evaluated,and the physical and mechanical parameters of the rock mass were determined.Using numerical simulation methods,stress,displacement,slip zones,and safety factors for the slope during different stages of open-pit mining were analyzed.The research results indicate that the safety factor of the slope decreases as the bench height increases.Under natural conditions,the safety factor in different excavation stages remains above 1.8,indicating good slope stability.Rainfall significantly affects slope stability,and under saturated conditions,the final slope s safety factor decreases to 1.36.However,this is still above the safety factor(1.25-1.20)stipulated in GB 51016—2014 Technical Specifications for Open-pit Mining Engineering in Non-coal Mines,indicating that the mine s slope design parameters are reasonable.The research results provide a reference for the design of subsequent safety facilities at the mine.