深凹露天转地下开采对高陡边坡稳定性影响数值分析

Numerical Analysis on High and Steep Slope Stability Influenced by the Transition from Deep Open-pit to Underground Mining

针对厂坝铅锌矿露天矿转地下开采的北帮高陡边坡稳定性问题,进行了不同开采深度的数值模拟研究和地下开采过程的仿真分析,由此获得了每次开采北帮边坡以及地下采场围岩的应力分布和塑性区范围,并给出了边坡稳定安全系数,结合围岩位移、塑性区范围以及边坡稳定安全系数随开采过程的变化规律,进行了北帮高陡边坡稳定性综合分析,揭示了北帮边坡稳定性随地下开采工程的变化规律,建立了边坡稳定性与开采深度的函数关系,并对该矿在露天转地下开采过程中的安全生产提出了几点意见和建议。

According to the high and steep slope stability during the transition from open-pit to underground mining in Changba Lead and Zinc Mine,numerical simulation under different mining depths and simulated analysis on underground mining were carried out. Therefore,the stress distribution and scope of plastic zone were obtained for the northern slope of each mining and underground surrounding rock. Meanwhile,the safety factors for slope stability were given. Combining with the variation regulation of rock displacement,plastic zone scope and the safety factors during underground mining,comprehensive analysis on the northern slope stability was put forward,which revealed the laws of the slope stability changing with underground mining,and established the functional relationship between slope stability with the mining depth. Finally,some opinions and suggestions were presented for safe production during the transition from open-pit to underground mining.