井工开采扰动对露天矿边坡稳定性影响研究

Influence of Underground Mining to Slope Stability Under Surface Coal Mine End-Slope

为充分回收露天煤矿端帮煤炭资源,在端帮边坡下采用井工开采具有重要意义。通过研究井工开采过程中岩体变化特征,分别分析了逆坡开采和顺坡开采过程中端帮岩体变形及移动特点,分析了保护煤柱对露天矿端帮井工开采过程的重要性,并给出了露井联合开采条件下边坡稳定性计算公式。采用有限元数值模拟方法,分别分析了顺坡开采和逆坡开采时端帮边坡稳定性及岩层顶板沉降量,经过分析确定:顺坡开采比逆坡开采对边坡稳定性影响较小,且预留保护煤柱在一定程度上能控制顶板变形。

In order to enhance the coal recovery of sarface coal mine, it has a great significance to adopt underground mining under the end-slope. After analyzing the rock deformation behavior during the exploitation process, the deformation and migration characteristic were analyzed, it is important for coal pillar to protect the end-slope, and the formula of the slope stability during adopting underground mining was given. Slope stability and rock roof settlement volume in the same direction and inverse mining were both analyzed by use of finite element numerical simulation method, the results show that the influence of the same direction mining to slope stability is less than the inverse mining, and the reserved protecting coal pillar can reduce the rock roof transformation to some extent.