露井联采下的边坡滑移规律分析

Analysis of Slope Sliding Law Under Open-Pit and Underground United Mining

为保证露井联采下边坡岩体的稳定性,以紫金山金铜矿为例,利用数值模拟方法建立模拟模型,系统模拟研究边坡岩体应力场和位移矢量场演化特点,揭示采空区上覆岩体滑移机理与动态演变规律,建立露井联采作用下的地表三维沉降模型和水平移动模型。实例计算结果表明:对采空区进行充填开采时,随着开采阶段向下延深,地下开采效应对上覆岩体影响逐渐减小,此时露井联采综合作用的边坡体主要受露天开采影响大小控制;当由+30 m水平开采至-150 m水平阶段时,边坡岩体发生局部破坏,破坏形式为塌陷破坏,需要进行局部加固处理。

In order to ensure the stability of slope rock mass under open-pit and underground united mining,taking Zijinshan Gold Copper Mine as an example,the numerical simulation method was used to establish the simulation model,systematically simulate the evolution characteristics of stress field and displacement vector field of slope rock mass,reveal the sliding mechanism and dynamic evolution law of overlying rock mass in goaf,and establish the surface three-dimensional settlement model and horizontal movement model under open-pit and underground united mining.The calculation results show that the influence of underground mining effect on the overlying rock mass gradually decreases with the mining stage extending downward,and the slope body under the combined action of open-pit and underground united mining is mainly controlled by the influence of open pit mining.When mining from+30 m level to-150 m level,the slope rock mass will be damaged locally,and the failure mode is collapse,which needs to be strengthened locally.