近距离煤层群上行开采研究

Study on ascending mining of close distance coal seams group

为研究8煤开采对上部11煤的影响,综合运用理论分析和数值计算的方法,对上行开采过程中,上部11煤底板位移场、应力场变化规律进行研究。结果表明:11煤位于8煤开采的弯曲下沉带内,煤体有一定的破坏,但保持了很好的连续性,而且14128工作面的开采降低了上煤层的应力,形成应力降低区;同时,增大了11煤的透气性,减小瓦斯压力,卸压效果显著,对高瓦斯的11煤安全开采提供了保障。最后,计算得出了卸压影响范围。

In order to study the influence of No. 8 seam mining on the upper No. 11 seam, theoretical analysis and numerical calculation were used to study the change law of the displacement field and stress field of the upper No. 11 seam floor during ascending mining. The results show that No. 11 seam is located in the curve subsidence zone of No. 8 seam mining, the coal body has certain damage, but it has a good continuity, and the stress of the upper coal seam is reduced because of the mining of 14128 working face and the stress decreasing zone has formed; at the same time, the permeability of No. 11 coal increases, the gas pressure reduces, and pressure - relaxing effect is obvious, and it provides protection for the safe mining of No. 11 seam which is of high gas. At last, the influence range of pressure relief is calculated.