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以鲍店煤矿10采区为背景,利用UDEC数值软件,研究高位硬厚岩层下近距离煤层开采超前支承压力及硬厚岩层底部应力变化规律。结果表明:上煤层开采时,超前支承压力及影响范围在硬厚岩层破断前达到最大值,硬厚岩层破断后,超前支承压力峰值呈周期性变化,变化范围较小,在硬厚岩层底部离层空间两端出现应力集中现象。下煤层开采时,超前支承压力集中程度高于上煤层工作面,在应力峰值外侧未趋于稳定,出现波浪形变化,硬厚岩层底部未形成显著的应力集中现象。
Taking the 10 mining area of BaoDian Coal Mine as a background, UDEC numerical software was used to study the advance bearing pressure and the variation of stress at the bottom of hard rock under the mining of high distance hard coal seam. The results show that when the upper coal seam is mined, the pressure and influence range of advanced bearing reach the maximum before the hard rock is broken. After the hard rock is broken, the peak value of the advance support pressure changes periodically with a small variation range. At the bottom of the hard rock Stress concentration occurs at both ends of the layer space. In the mining of lower coal seam, the pressure of advanced support is higher than that of the upper coal seam, and it does not tend to be stable outside the peak of stress, and the wavy shape changes. There is no significant stress concentration at the bottom of the hard rock.