浅埋近距离煤层煤柱下开采异常矿压机理

发布时间：2018-06-12 08:24

本文选题：近距离煤层 + 浅埋煤层　；参考：《煤炭学报》2017年S1期

【摘要】：针对补连塔煤矿22307工作面过边界煤柱阶段发生的强动压灾害问题,采用现场实测、理论分析等手段,研究了浅埋近距离煤层大采高工作面边界煤柱下开采异常矿压显现发生机理。结果表明:浅埋近距离厚煤层开采时,下煤层工作面推进至进煤柱阶段发生强动压灾害,支架活柱下缩量达到1 000 mm;下煤层工作面推进过程中,两层煤之间的关键层结构也不断的变化,重复采动阶段,两层煤之间存在一组亚关键层结构,进煤柱阶段,两层煤之间存在一组主关键层结构;进煤柱阶段,煤柱上方关键块的铰接结构发生反向回转运动,导致主关键层关键块上覆载荷增加,发生滑落失稳,引发强动压灾害,同时造成地表出现大的台阶下沉现象。
[Abstract]:In view of the problem of strong dynamic pressure disaster occurred at the stage of coal pillar crossing boundary in 22307 face of Bulianta Coal Mine, the field measurement and theoretical analysis are adopted. The occurrence mechanism of abnormal rock pressure under pillar mining in large mining face of shallow and close distance coal seam is studied. The results show that strong dynamic pressure disaster occurs in the working face of the lower coal seam during the mining process of shallow buried thick coal seam, and the shrinkage of the support movable pillar reaches 1 000 mm, while the working face of the lower coal seam is advancing. The structure of the key layer between the two layers of coal is also constantly changing. In the stage of repeated mining, there is a group of sub-critical layer structure between the two layers of coal, the stage of entering coal pillar, and the structure of a group of main key layers between the two layers of coal. The hinged structure of the key block above the coal pillar is rotated in reverse direction, which results in the increase of the overburden on the key block of the main key layer, the occurrence of sliding and instability, the occurrence of strong dynamic pressure disaster, and the appearance of large step subsidence on the surface.
【作者单位】：河南理工大学能源科学与工程学院;中国矿业大学深部岩土与地下工程国家重点实验室;
【基金】：国家自然科学基金联合基金资助项目(U1261207) 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1310) 河南省教育厅科学技术研究重点资助项目(14A440001)
【分类号】：TD323;TD823.81

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