近距离厚煤层重复采动覆岩“两带”高度分析

Analysis of“Two Zones”Height in Overburden above Small Interval Thick Coal Seams Repeated Mining

随着煤炭资源大规模开发利用,许多矿区面临近距离煤层重复回采问题,其中重复采动造成的“两带”发育高度是指导多煤层开采的重要指标参数,而现有相关规定中对近距离煤层重复采动高度缺少理论性分析,因此为合理确定近距离煤层重复采动覆岩“两带”高度,利用理论分析和数值模拟计算对近距离煤层重复采动覆岩“两带”高度进行分析和讨论。研究结果表明:近距离煤层开采时,煤层间距大于或小于下层煤垮落带高度,下层煤开采均会导致上层煤的垮落带和导水裂缝带高度增加,并且垮落带高度占导水裂缝带高度中的比例增加,重复采动的“两带”高度需要增加下层煤回采造成的等效采后影响。研究结果对于近距离煤层重复采动覆岩“两带”高度的确定具有理论意义和指导价值。

Along with extensive exploitation and utilization of coal resources,many mine areas have faced issues from small interval coal seams repeated extraction.In which,repeated mining caused caving and fissure two zones developed height is major indicative parameters to guide multiple coal seams mining.While to small interval coal seams repeated mining is lack of theoretical analysis in available relevant regulations.Thus to reasonable determination of overburden“two zones”height in overburden above small interval coal seams repeated mining has been analyzed and discussed through theoretical analysis and numerical simulation computation.The result has shown that during the small interval coal seams mining,the interval greater than or less than lower coal seam caving zone height,the extraction of lower coal seam will cause upper coal seam caving zone and water conducted fissure zone height increased,and proportion of caving zone in water conducted fissure zone increased.The“two zones”height in repeated mining should increase lower coal seam extraction caused equivalent post mining effect.The studied results have theoretical significance and guidance value for small interval coal seams repeated mining overburden“two zones”height determination.