南芬露天铁矿下盘采动时边坡稳定性数值模拟

通过分析南芬露天铁矿下盘边坡的区域地质资料,确定出降雨和爆破震动为影响边坡稳定性的主要因素。根据前期研究成果,对5~#坡体剖面建立数值模拟计算模型,同时导入SLOPE/W模块,分析爆破和降雨耦合作用对扩帮前后边坡稳定性的影响。研究结果表明:岩体扩帮采动前后孔隙水压力变化不大,但是在近似梯形岩体开挖之后,一部分自重应力被消除,对边坡的地应力产生了显著影响。扩帮采动后的边坡在耦合作用下整体安全性变差,但依然保持稳定。286~454 m段属危险性边坡,454~574 m段边坡保持稳定。

Slope Stability Numerical Simulation of the Footwall Slope under Mining Conditions in Nanfen Open-pit Mine

The rainfall and blasting vibration are the main slope stability influence factors by analyzing the regional geo-logical data of the footwall slope of of Nanfen Open-pit Iron Mine. Based on the early study results,the numerical simulation computational model of 5# slope profile is established,combing with SLOPE/W module,the influence of coupling effect of rain-fall and blasting vibration to slope stability. The study results show that,the changes of pore water pressure is little before and after the rock mass expansion mining,however,after the excavation of approximately trapezoidal rock mass,a part of gravity stress is eliminated,which has a significant effect on the in-situ stress of slope. The whole safety of the slopes under the action of expansion is deteriorated,but the stability of slope remains stable. The slope section of 286~454 m is belongs to the danger-ous slope,the stability of slope section of 454~474 m is good.