急倾斜煤层工作面开采参数对采动应力的影响规律

Influence Law of Working Face Parameters on Mining-Induced Stress in Steep Inclined Coal Seam

针对急倾斜煤层工作面倾角大、矿压规律难于掌握、设备和煤岩体稳定控制困难的现状,结合新强煤矿58#煤层右三片急倾斜工作面煤岩赋存条件,数值模拟研究不同工作面长度、煤层倾角和采高时采动应力分布规律,结果表明:急倾斜煤层工作面顶底板区域内呈现非对称的“耳朵”状卸压状态,卸压范围随着工作面长度、采高的增加而变大,随倾角增加采动影响范围的宽度变小,但影响高度变大;工作面沿走向的采动应力要明显小于沿倾斜方向,倾角越大,沿倾斜方向的应力越大,沿走向方向的应力越小;倾角、工作面长度、采高越大,工作面两端的围岩越不稳定。

According to the current situation of large dip angle, mine pressure regularity is hard to grasp, stability control difficulty of equipment and rock mass. Based on the occurrence conditions of steep rock strata in the 58# coal seam at Xinqiang mine, the numerical simulation was used to re-searching mining-induced stress of different working face lengths, coal seam dip angles and mining heights. The results showed that the mining-induced stress appears asymmetric "ear-shape"unloading state at the roof and floor in steep inclined coal seam working face. The relief range of mining-induced stress increased with the increase of working face lengths and mining heights. With the increase of dip angle, the width of mining influence range decreases, but the influence height increases. The mining-induced stress along the strike direction of the working face is obviously smaller than that along the inclined direction. The larger the inclination angle, the greater the mining-induced along the inclined direction, and the smaller mining-induced along the strike direction. The larger inclination angle, the length of the working face and the mining height, the more unstable of surrounding rocks at two ends of working face are.