【摘要】 为了增强沿空掘巷巷道的稳定性,提高资源回采率,以大同矿区塔山煤矿8204工作面为研究背景,对沿空掘巷留设区段煤柱的合理宽度进行了研究。首先对特厚煤层综放工作面在沿空掘巷情况下区段煤柱的合理宽度进行了理论分析,然后采用FLAC3D数值模拟软件建立了采空区一侧不同宽度区段煤柱的力学模型,通过模拟结果表明:区段煤柱的宽度在5~10 m时,巷道处于低应力区,支护相对稳定。最后将理论计算和数值模拟相结合,同时参考塔山矿综放工作面矿压显现规律及微地震监测得出的相关结论,综合考虑巷道跨度大、隔绝采空区瓦斯等安全因素,确定了特厚煤层综放工作面沿空掘巷留设区段煤柱的合理宽度为8 m。更多还原

【Abstract】 In order to improve the stability of the wall rock around the goaf- side driving roadway and the utilization rate of coal resources,Tashan Coal Mine of Datong mining area was taken as the research object,the reasonable width of segment coal- pillar for the goaf- side driving in fully mechanized caving face of ultra- thick coal seam was studied in this paper. At first,the theoretical analysis of reasonable width of segment coal pillar was carried out,then the mechanical models of goaf- side segment coal pillars in different widths were established by numerical software FLAC3 D. The results of numerical stimulation showed that when the width of segment coal- pillar was from 5 m to 10 m,the roadway was in the low stress area and the support would be relatively stable. Finally,combined theoretical calculations with numerical simulation,referring to the ground pressure law and the results of micro- seismic monitoring in fully mechanized caving face of Tashan Coal Mine,considering the roadway span,isolated goaf gas and other safety factors,it was determined that the reasonable width of segment coal pillar was 8 m.更多还原