近距离关键层群同步破断机理研究

Research on Synchronous Breakage Mechanism of the Key Stratum Group With Nigh Distance

为研究浅埋深煤层开采时关键层群同步破断失稳机理,以王家塔煤矿为研究背景,结合矿山压力及岩层控制相关理论,运用数值模拟软件UDEC对煤层上覆岩层中存在单一关键层和2层关键层结构进行模拟,现场实测数据验证同步破断失稳理论。结果表明:当煤层上覆岩层中存在距离较近、岩性相近的2层关键层时,其服从关键层同步破断判据,可将其整体结构视为单一关键层结构进行稳定性分析,对矿压显现与岩层控制的影响也与单一关键层一致。

In order to study synchronous breakage instability mechanism of the key stratum group in the deep shallow buried coal seam mining, taking Wangjiata Coal Mine as research background, combined with the mining pressure and strata control related theory, nu- merical simulation software UDEC is used to simulate the situation of single key stratum and double key stratum structure in the over- burden of coal seam. The measured data verified synchronization rupture instability theory. Results show that when there are double key stratum which is nigh distance and lithology similar in the overburden of coal seam, it obeys the key stratum of synchronous fracture cri- terion, its stability of whole structure can be regarded as a single key stratum structure analysis and the influence of rock pressure and strata control is consistent with a single key stratum.