特厚煤层综放工作面沿空掘巷区段煤柱合理宽度确定
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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。
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.
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.
引文
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[6]宋振骐.实用矿山压力[M].徐州:中国矿业大学出版社,1988:41-78.
[7]成云海,姜福兴,庞继禄.特厚煤层综放开采采空区侧向矿压特征及应用[J].煤炭学报,2012,37(7):1088-1093.
[8]候朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989,14(4):21-29.
[9]谢广祥,杨科,刘全明.综放面倾向支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545.
[10]孔令海,姜福兴,刘杰,等.特厚煤层综放工作面区段煤柱合理宽度的微地震监测[J].煤炭学报,2009,34(7):55-59.
[2]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003:201-204.
[3]杨吉平.沿空掘巷合理窄煤柱宽度确定与围岩控制技术[J].辽宁工程技术大学学报,2012,32(1):39-43.
[4]韩承强,张开智,徐小兵,等.区段小煤柱破坏规律及合理尺寸研究[J].采矿与安全工程学报,2007,24(3):370-373.
[5]柏建彪,王卫军,候朝炯,等.综放沿空掘巷围岩控制机理及支护技术研究[J].煤炭学报,2000,25(5):478-481.
[6]宋振骐.实用矿山压力[M].徐州:中国矿业大学出版社,1988:41-78.
[7]成云海,姜福兴,庞继禄.特厚煤层综放开采采空区侧向矿压特征及应用[J].煤炭学报,2012,37(7):1088-1093.
[8]候朝炯,马念杰.煤层巷道两帮煤体应力和极限平衡区的探讨[J].煤炭学报,1989,14(4):21-29.
[9]谢广祥,杨科,刘全明.综放面倾向支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545.
[10]孔令海,姜福兴,刘杰,等.特厚煤层综放工作面区段煤柱合理宽度的微地震监测[J].煤炭学报,2009,34(7):55-59.
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