上行开采可行性综合判别研究及回采巷道布置

Comprehensive Discriminant Study on the Feasibility of Upward Mining and the Layout of Mining Roadway

根据某煤层赋存条件,采用比值判别、“三带”判别、围岩平衡等理论方法,结合物理相似模拟实验和数值模拟分析,综合判断5^#、10^#煤层上行开采的可行性。结果表明,利用3个理论方法判别出上行开采是可行的;通过物理相似模拟实验可知,L1石灰岩减少了下部岩层的下沉和裂隙对5#煤层的影响,使得5#煤层最终处于弯曲下沉带中;数值模拟结果表明5#煤层整体位于弯曲下沉带,同时得出10#煤层开采后5#煤层的最大垂直位移1.24m和最大倾斜值43.3mm/m,应力集中处最大下沉量不超0.6m,最大倾斜值为43.3mm/m。最终根据移动盆地理论,给出5^#煤层回采巷道合理的布置位置。

According to the occurrence conditions of a coal seam,the ratio discrimination method,"three-belt"discrimination method,surrounding rock balance method were used to comprehensively study the feasibility of the upward mining of 5#and10#coal seams in a mine by combining with physical similarity simulation experiment and numerical simulation calculation.The results showed that the upward mining was feasible studied by three theoretical methods.Through the physical similarity simulation experiment,it was found that the subsidence of the lower strata and the influence of the fissure on the 5#coal seam was reduced due to L1 limestone,so that the 5#seam was in the curved subsidence zone.The simulation results showed that the whole 5#coal seam was located in the curved subsidence zone.And after mining 10^#coal seam,the maximum vertical displacement and the maximum tilt value of 5^#coal seam respectively was 1.24 mand 43.3 mm/m,the maximum subsidence amount in the stress concentration area was not more than 0.6 m,and the maximum tilt value was 43.3 mm/m.Finally,according to the theory of mobile basin,the reasonable layout position of the mining roadway in the 5^#coal seam was given.