新疆准东露天煤矿单一巨厚煤层复合边坡空间形态优化

针对单一巨厚煤层露天矿土-岩复合边坡稳定性及空间形态问题,以新疆准东露天矿为工程背景,采用刚体极限平衡和FLAC3D数值模拟相结合的方法,研究了露天矿复合边坡的稳定性及空间形态,分析了复合边坡的潜在滑动模式及稳定性规律,确定了采场与排土场的最大安全距离。研究结果表明:新疆准东露天矿采场最终边坡角为34°,排土场边坡角为23°,排土场与采场安全距离为150 m时满足安全性与经济性要求;单一巨厚煤层露天矿土-岩复合边坡的滑坡模式为沿排弃物内部的圆弧滑动和以坡体出露弱层面为底界面的组合滑动;在岩体自身重力作用下,单一巨厚煤层露天矿土—岩复合边坡破坏形式为拉张—剪切复合型。

Spatial Formation Optimization of Composite Slope of Single Thick Coal Seam of Zhundong Open-pit Coal Mine in Xinjiang

According to the stability and spatial formation of the composite slope with soil and rock of the open-pit mine with single thick coal seam,taking Zhundong Open-pit Coal Mine in Xinjiang as the engineering background,the combination method based on rigid body limit equilibrium method and FLAC3D numerical simulation method is adopted to study the spatial formation and stability of the composite slope of open-pit mine,analyze the potential sliding mode and stability regularity of composite slope and determine the maximum safety distance between mining area and dumping site. The study results show that the requirements of safety and economical can be met based on the final slope angle of Zhundong open-pit mining area is 34°, the slope angle of dumping site is 23° and the safety distance between mining area and dumping site is 150 m;the circular slid-ing mode that is along the inside of waste materials and combined sliding model that taking the slope exposed weak layer as the bottom layer of slope are the sliding modes of composite slope with soil and rock of the open-pit mine with single thick coal seam;under the action of rock mass wight,the failure mode of composite slope with soil and rock of open-pit mine with single thick coal seam is the mixed failure mode of tensile and shear.