浅埋近距离煤层内错布置采空区自燃危险区域研究

发布时间：2018-01-09 21:52

本文关键词：浅埋近距离煤层内错布置采空区自燃危险区域研究　出处：《中国安全生产科学技术》2016年02期 　论文类型：期刊论文

【摘要】：浅埋近距离煤层内错布置开采下部煤层时,地表裂隙易与复合采空区相互贯通,造成地表漏风,使采空区,特别是上部老采空自燃危险区域的分布难以预测。针对此问题,以酸刺沟煤矿6上109工作面至地表空间为研究对象,在漏风测定及束管监测的基础上,建立地表与复合采空区漏风模型,借助FLUENT数值模拟软件,研究地表漏风对复合采空区自燃危险区域的影响。研究表明,地表漏风最终汇入下部采空区回风侧,加大了其自燃危险区域范围;漏风流在向回风侧偏移的过程中,由于煤柱的阻挡,风速逐渐降低,与下部漏入的风流共同作用,使上部老采空区形成了氧浓度中间低四周高的不规则环状自燃危险区域;下部采空区进风侧向上的漏风增加了本煤层采空区的总漏风量,加大了其自燃危险区域宽度,同时增加了上部老采空区局部氧浓度,使其自燃危险性增大。
[Abstract]:When the shallow and close distance coal seam is disarranged and mined in the lower coal seam, the surface fissure is easily connected with the compound goaf, resulting in the surface air leakage and goaf. Especially, it is difficult to predict the distribution of the dangerous area of spontaneous combustion in the upper old coal mining. Aiming at this problem, taking the space from 109 working face to the surface of No. 6 coal mine as the research object, based on the measurement of air leakage and the monitoring of the beam tube. The air leakage model of surface and compound goaf is established, and the influence of surface air leakage on the dangerous area of spontaneous combustion in compound goaf is studied by means of FLUENT numerical simulation software. The surface air leakage finally flows into the return wind side of the lower goaf, which increases the range of the spontaneous combustion danger area. During the migration of leakage air flow to the return air side, the wind speed decreases gradually due to the block of coal pillar, and it acts together with the air flow in the lower part. The old goaf in the upper part formed irregular annular spontaneous combustion dangerous area with low oxygen concentration and high around the middle. The air leakage in the lower goaf increases the total air leakage of the goaf, increases the width of the spontaneous combustion danger zone, and increases the local oxygen concentration in the old goaf of the upper goaf, which increases the risk of spontaneous combustion.
【作者单位】：辽宁工程技术大学安全科学与工程学院;煤矿重大动力灾害防控协同创新中心;伊泰集团酸刺沟煤矿;
【基金】：国家自然科学基金项目(51574143);国家自然科学基金青年基金项目(51404127) 国家科技支撑计划项目(2013BAK06B00)
【分类号】：TD752.2
【正文快照】： 0引言浅埋近距离煤层开采时,因多次采动影响,采空区易与地表连通,造成地表及采空区间漏风,一旦发生遗煤自燃,产生的有毒有害气体将在多煤层间流动,发火地点难以判断,治理困难。因此对浅埋近距离煤层采空区自燃危险区域进行研究,对掌握上下采空区氧浓度分布、自然发火地点的判

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