平庄西露天矿露井联采高陡长大边坡稳定性监测研究

Study on stability monitoring of large high-steep slope under combined open-pit with underground mining in Pingzhuang western open-pit mine

为掌握平庄西露天矿露井联采顶帮边坡的岩移规律与稳定性状态,揭示地下开采对边坡稳定性的影响,基于对典型滑坡位移-时间特征的认识,提出用位移历时曲线与位移加速度历时曲线形态判断边坡稳定性状态,并详细对比分析了布置在井工开采边界以及边坡走向与倾向方向上各监测线的地表位移监测数据。结果表明,平庄西露天矿顶帮现状边坡整体处于稳定状态,II区凸边坡为相对不稳定区域;边坡岩移规律及稳定性主要受断层、弱层、边坡平面形态、地下开采及其引起的断层活化等因素综合控制;地下开采对边坡稳定性影响范围的边界大约在边坡表面出露标高+572m。

To master the rock shift regularity and stability status of top slope under combined open-pit with under- ground mining in Pingzhuang western open-pit mine, and reveal the influence of underground mining on slope sta- bility, it was put forward to judge the stability status of slope by the displacement duration curve and displacement acceleration duration curve based on the recognition of typical landslide displacement-time feature, and the surface displacement monitoring data of each monitoring lines arranging on the underground mining boundary and in advan- cing and dip directions of the slope were contrastively analyzed. It showed that the whole top slope in Pingzhuang western open-pit mine was temporarily in steady state, and the convex slope in II region was unstable relatively. The rock shift regularity and stability of slope were comprehensively controlled by fault, weak layer, slope plane form, underground mining, and fault activation caused by underground mining etc. The boundary of influence scope by underground mining on slope stability was about in slope surface elevation ＋ 572m.