平四矿近距煤层上行开采研究

Study of Ascending Mining of Short-Range-Seams in Pingdingshan No.4 Coal Mine

在对煤层赋存条件进行分析的基础上,根据平四矿己16煤层的采动覆岩裂隙发育规律,阐释了近距煤层上行开采机理,分析了上行开采可行性的判别准则.采用数值计算软件UDEC,分别建立了煤层开采走向和倾向模型,计算并分析了己16煤开挖后不同层位覆岩的变形状况及其影响范围.模拟结果表明,先采己16煤后,己15煤的倾斜值即其台阶下沉量比较小,未超过煤厚之半(750 mm),除工作面两端头对应区域外,煤层表现的很连续.同时表明,下煤层的开采对上煤层的破坏程度在走向方向上比在倾斜方向上大.模拟结果与工程实践情况相符,并经两工作面应用,证明上行开采是可行的,并采用国产设备成功解决了上煤层的薄煤层综合机械化开采.

Based on the coal-preserving structure and the development regularities of mining induced fractures, the traditional judgments of ascending mining of short-range-seams and the mechanism of ascending mining was expatiated. The numerical software UDEC was used to build the horizontal model as well as the inclined model to analyze the overlying strata deformation and its affecting scale of different horizons. Numerical simulation results show that, after No. 16 coal seam has been mined, the subsidence of the No. 15 coal seam does not reach 750 mm, half of its thickness. Except the area corresponding to the face end of the No. 16 long wall coalface, the No. 15 coal seam keeps a continuous appearance, showing that the failure of the upper coal seam in advancing direction is more serious than the inclined direction after the lower coal seam is mined. The engineering practice of the two coalfaces well agrees with the numerical simulation result. So the ascending mining is feasible, which means that the domestic fully mechanized equipments can be used to exploit the upper thin coal seam.