贯穿断层对露天矿终了边坡稳定性影响的研究

Study on Influence of Penetrating Faults on Stability of End Slope of Open-pit mine

为了研究贯穿断层对某露天矿山终了边坡稳定性的影响,保障矿山安全生产,通过现场调查断层产状信息,采用赤平投影法、极限平衡法以及数值模拟的综合分析方法,研究了该露天矿终了边坡在贯穿断层影响下的稳定性状态。研究结果表明:断层的存在控制了该区域终了边坡的潜在破坏模式,滑动面上部沿断层平面发展;断层加大了坡体开挖后的应力松弛影响,边坡顶部出现小范围的拉应力区,该区域可能产生张拉破坏;终了边坡最大位移值出现在断层影响区域,爆破附加荷载使位移呈现增加趋势,应严格控制临帮爆破,避免边坡失稳。

In order to study the influence of penetrating faults on the stability of the end slope of an open-pit mine and ensure the safe production of the mine,the stability state of the end slope of the open-pit mine under the influence of penetrating faults is studied by means of field investigation of fault occurrence information,stereographic projection method,limit equilibrium method and numerical simulation.The re⁃sults show that the existence of faults controls the potential failure mode of the end slope in this area,and the upper part of the sliding surface will develop along the fault plane.The fault increases the stress relax⁃ation effect after slope excavation,and a small range of tensile stress area appears at the top of the slope,which may cause tensile failure.The maximum displacement value of the slope appears in the fault affected area,and the additional load of blasting makes the displacement show an increasing trend.The side blasting should be strictly controlled to avoid slope instability.