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针对平均煤层厚度为21m的具体情况,分别采用离散元数值分析软件UDEC3.1和相似材料模拟进行了研究,研究表明大采高使工作面前方支承压力分布范围增大和峰值位置前移,沿着工作面推进方向,覆岩整体呈现梯形跨落,覆岩跨度不断增加,引起的地表移动范围也不断增大,完全采动影响下,地表垂直沉降范围大致为跨度的2.6倍。
Aiming at the situation that the average thickness of coal seam is 21m, discrete element numerical analysis software UDEC3.1 and similar material simulation are used respectively. The results show that large mining height increases the distribution range of supporting pressure in front of working face and shifts the peak position along In the direction of advancing face, the overlying strata show trapezoidal stratification as a whole, the strata span of strata continuously increases, and the range of surface movement caused by them increases. Under the condition of fully mining, the vertical subsidence range of the earth’s surface is about 2.6 times of the span.