露天边坡大型滑坡稳定性分析与治理方案

Stability Analysis and Treatment Scheme of Large-scale Landslide of Open Pit Slope

针对锦丰露天金矿西部运矿道大型滑坡,从地质构造、水、风化、爆破及采矿活动等多方面进行滑坡原因分析,提出预应力长锚索、喷锚网、抗滑桩、重力式挡墙及泄水泄压孔对滑坡进行综合治理,毛石混凝土分层回填修复西部运矿道的方案。应用岩石力学软件Slide对修复后的运矿道边坡进行模拟,从理论上分析修复后的边坡稳定性,模拟结果显示边坡最低安全系数为1.13,大于边坡破坏安全系数1.0。采用机器人监测系统Autoslope和地质雷达监测系统Radar Monitoring System对边坡进行变形监测,监测精度最高可达0.1 mm;经过1 a多的监测,结果显示边坡处于稳定状态。理论分析和实际监测结果表明:①采用长锚索、喷锚网,抗滑桩、重力式挡墙及泄水泄压孔对滑坡进行综合治理具有良好的加固效果;②毛石混凝土分层回填对大型滑坡进行处理效果明显。该处理方法在相关滑坡治理中具有一定借鉴意义。

In view of large-scale landslides in western mine transport of Jinfeng Open Pit Gold Mine,the reasons for it were analyzed from aspects of geological structure,water,weathering,blasting and mining activities etc..It is proposed that landslides be comprehensively treated by long pre-stressed anchor,bolt-shotcrete-net,anti-sliding pile,gravity guard wall and dewatering/depressurization holes etc.,and stone-concretes were backfilled in layers to reconstruct western the mine transport road.With application of rock mechanics software Slide,the reconstructed slopes of the mine transport road were simulated to make theoretical analysis its slope stability.The simulation results showed that the minimum safety factor of the slope is 1.13,greater than the safety factor 1.0 of slope failure.Robotic monitoring systems Autoslope and geological radar monitoring systems are adopted to survey the slope deformation with monitoring accuracy up to 0.1 mm.1-year monitoring result showed that the slope was in a stable condition.Through theoretical analysis and practical monitoring,the results showed that：① The adoption of long cable,bolt-shotcrete-net,anti-sliding pile,gravity guard wall and dewatering/depressurization holes had a good reinforcement effect; ② Stone-concrete backfilling in layers had an obvious effect in large-scale landslide treatment.This treatment method has some reference in the relevant landslide treatment.