露井联采下煤层倾角对岩体运移规律的影响
open-pit combined underground mining; coal seam production; numerical simulation; rock formation angle; stability coefficient
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摘要: 为了研究不同煤层产状条件下,露井联采叠加扰动对露天矿端帮边坡稳定性的变化规律,依据煤层赋存条件及开采方式将端帮边坡下煤层产状分为水平、顺倾、逆倾3种类型,通过数值模拟方法从端帮边坡的高应力区分布、变形破坏程度和破坏范围3个方面进行研究,得出露天矿端帮相同开采工艺、不同煤层倾角条件下边坡稳定性变化规律。结果表明:煤层倾角越大,工作面两侧高应力区影响范围越大,合理控制开切眼位置与边坡面的距离,可避免井采高应力区对边坡稳定性的影响;端帮下煤层倾角越大,井工开采后边坡的破坏范围越大,煤层为顺倾赋存状态时的对边坡的破坏程度大于水平赋存状态,而逆倾赋存状态破坏程度小于水平赋存状态;端帮下煤层顺倾状态不利于边坡稳定,煤层逆倾状态有利于边坡稳定。Abstract: To study the change law of the open-pit combined underground mining and superimposed disturbance on the stability of the side slope of the open-pit mine under different coal seams production, according to the occurrence conditions and mining methods of coal seams, the coal seam production under the side slope are divided into three types, including the horizontal state, rightward inclination and reverse inclination. The numerical simulation method is used to study the distribution of high stress area, the deformation degree and the damage extent. The variation law of slope stability under the same mining process and dip angle of different coal seams is obtained. The results show that the larger the dip angle of coal seam is, the larger the influence range of high stress area on both sides of the working face is. It is necessary to reasonably control the distance between the position of open cut and the slope surface, which can avoid the influence of the high-stress area of the mining on the slope stability; the greater the dip angle of the coal seam under the end is, the greater the damage extent of the slope after the mining is. When the coal seam is in the state of the rightward inclination, the damage degree to the slope is greater than the horizontal occurrence state, and the degree of damage caused by the reverse tilting state is less than the horizontal occurrence state; the rightward inclination of side slope for the coal seam is not conducive to the slope stability, and the reverse inclination state of the coal seam is conducive to the slope stability.
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