论文部分内容阅读
以宁东煤田某煤矿为例,首先采用理论计算和数值模拟法对只有上部煤层开采时其底板破坏规律进行了分析,然后利用数值模拟法总结了在下部煤层开采后上部煤层开采时其底板破坏规律。单一煤层开采时底板破坏深度随着工作面回采呈现出“台阶状”增加,并且初始破坏深度较小;下部煤层开采后上部煤层开采时其底板破坏深度随着工作面回采变化不大,并且初始破坏深度较大。
Taking a coal mine in Ningdong coalfield as an example, the rule of floor failure when only the upper coal seam is mined is analyzed by theoretical calculation and numerical simulation. Then, the bottom plate failure of upper coal seam after mining of the lower coal seam is summarized by numerical simulation law. When the single coal seam is mining, the failure depth of the bottom plate increases with “step-shape” when the working face is recovered, and the initial destructive depth is small; when the upper coal seam is mined, the depth of the bottom plate destruction after the mining of the lower coal seam changes little with the recovery of the working face, And the initial damage depth greater.