露天转地下开采诱发高边坡滑移机制研究

露天转地下开采过程中边坡稳定问题是矿山安全生产的关键技术和核心难题之一。以工程实例为基础,应用离散元数值模拟,选取合适的力学参数,运用3DEC、Matlab等软件系统,分析了地下开采对高大边坡稳定性的影响机制、滑移特点和后续变形发展趋势。研究结果表明:受露天与地下开采两者的复合采动作用的影响,滑移变形产生了叠加作用,地表的下沉曲线形成多个大小不同的下沉盆地,导致不同区域边坡岩体变形破坏程度也不同。根据数值模拟结果可知:地下采区的不同开采阶段诱发的移动角大小不同,开采厚度不同,上覆岩体的破坏程度也不同。所以,露天转地下开采中,边坡稳定性主要受到采空区处理方式和开采厚度等多重因素的影响;在边坡稳定性评价时,需要结合具体开采情况进行分析和评价。

Study on High Slope Sliding Deformation Mechanism induced by Transiting from Opencast into Underground Mining

The slope stability during transition from opencast into underground mining is one of the key techniques and the core issues in safe mining production.Based on engineering project，the numerical simulation analysis of discrete element method is applied to select appropriate mechanical parameters.With the use of 3DEC，Matlab and other software systems，the slope stability，slip deformation characteristics and follow trends of high slopes at underground mining are analyzed.As the result，Due to the combined impact of both underground mining and open-pit mining，the surface subsidence curves show as multiple sink basins of different sizes under superposition，so the rock slope deformation extent at different regions are different.According to the results of numerical simulation，the mining-induced displacement angle at underground mining area are different at the different exploitation stage，indicating that with different mining thickness，the damage level of the overlying rock is different.So during the transition from opencast into underground mining，the slope stability is mainly impacted by multiple factors such as goaf treatment and different mining thickness.Furthermore，the slope stability evaluation requires a combination of the specific circumstances of the mining.