巷采厚煤层上位煤层开采覆岩结构稳定性研究

Study on Upper Coal Seam Mining and Stability of Overlying Strata Structure in Roadway Mining Thick Coal Seam

下窑煤业9特厚煤层房柱式开采后,根据各煤层赋存条件,综合运用理论分析、数值模拟以及现场实测对9煤层覆岩稳定性进行研究。运用理论经验公式计算分析,考虑到4煤层赋存条件和9煤层的开采条件以及层间岩性等因素,对层间岩层的稳定性判定为基本稳定。通过数值模拟计算和现场监测分析:9煤层开采并不会破坏4煤层的完整性和连续性,并且还会降低上覆岩层的应力;4煤层蹬空开采过程中并不会对9煤层采空区稳定性造成破坏。

After the room-and-pillar mining of No.9 extra-thick coal seam in Xiayao coal industry,according to the occurrence conditions of each coal seam,the stability of overlying strata in No.9 coal seam was studied by theoretical analysis,numerical simulation and field measurement.Using theoretical empirical formula to calculate and analyze,taking into account the occurrence conditions of No.4 coal seam and No.9 coal seam mining conditions and interlayer lithology and other factors,the stability of interlayer rock strata is determined to be basically stable.Through numerical simulation and field monitoring analysis:No.9 coal seam mining will not destroy the integrity and continuity of No.4 coal seam,and will reduce the stress of overlying strata;the stability of the No.9 coal seam goaf will not be damaged during the mining process of the No.4 coal seam.