露天煤矿采场软岩边坡稳定性研究

Analysis on Opencast Coal Mine Slope Soft Rock Slope Stability

针对某露天煤矿采场边坡出现的不稳定现象,通过大量现场地质调查,总结分析出滑坡主要是由采区软岩地质造成。在此基础上采用FLAC—拉格郎日显式有限差分法对采场的边坡进行分析,并根据模拟采场边坡的应力、应变及位移情况,通过分析确定危险边坡的潜在不稳定范围。分析过程中充分利用FLAC—拉格郎日显式有限差分法对应力应变逼真的模拟这一特点,采用理论分析与数值模拟二者相结合,计算得出边坡的稳定系数,对露天煤矿边坡稳定性做出了客观评价,为露天矿下一步滑坡防治方案、边坡监测方案的制定提供了决策依据,对实际生产有着及其重要的指导意义。

Against an opencast coal mine pit slope instability occuring through a large number of on - site geological survey, the reason of the landslide in the mining area is summarized and analyzed to be mainly caused by soft - rock geology. With FLAC-Lagrange explicit finite difference method, the slope stability is analyzed. Based on the simulation of pit slope of the stress, strain and displacement, the scope of the potential risk of slope instability is determined. The realistic simulation of the method for effects of stress and strain of this prominent feature is used. The theoretical analysis and numerical simulation are combined to calculate the slope stability factor. An objective assessment of slope stability for the open-pit mine is made for next step. A decision-making basis is provided for the development of slope monitoring program, with important guiding significance for the actual production.