黑岱沟露天矿边帮压煤回采围岩稳定性及控制技术研究

Study on surrounding rock stability and control technology of under-slope coal mining in Heidnigou Open-pit Mine

为有效保障黑岱沟露天矿边帮压煤实施井工回采时工作面的安全,防止采动应力降低边帮围岩稳定性,采用M-P法、Bishop理论计算及理论分析方法对边帮围岩稳定性现状、开采对边帮围岩的影响进行了分析,并提出了开采期间边帮围岩的控制及监测方案。在对边帮整体挂柔性网进行护坡、局部破碎地段进行围岩加固的基础上,利用三维激光扫描及地音监测系统分别对工作面回采期间边帮围岩形变、边帮围岩裂隙扩展及破断进行实时动态监测,有效地防止了边帮围岩滑坡。

In order to effectively ensure the safety of the working face when underground coal mining is carried out on the under-slope coal of open-pit mine,and prevent the mining stress from reducing the surrounding rock stability of the side slopes,the article uses M-P method,Bishop theoretical calculation and theoretical analysis methods to analyze the present situation current of side slopes surrounding rock stability and the influence of mining on the side slopes surrounding rock,the control and proposes monitoring plan for the side slopes surrounding rock during mining.On the basis of the slope protection by hanging flexible nets on the side slopes and the surrounding rock reinforcement in the partially broken sections,we use 3D laser scanning and earth-sound monitoring system for real-time dynamic monitoring the deformation,crack propagation and fracture of side slopes surrounding rock during the working face mining period,which can effectively prevent side slopes surrounding rock landslides.