倾斜煤层沿空掘巷窄煤柱稳定与宽度优化研究
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摘要
为研究倾斜煤层综放沿空掘巷窄煤柱的稳定与宽度优化设计,基于沿空掘巷护巷煤柱周围矿山压力分析和煤柱合理留设宽度经验公式计算结果(5.61～12.46 m),采用FLAC~(3D)模拟软件,在无支护条件下对6、8、10、12 m这4种煤柱宽度间的应力场、位移场和塑性区分布进行数值分析比较。结果表明,最优护巷煤柱宽度为8.0 m。因此,在确定最优护巷煤柱宽度基础之上,通过FLAC~(3D)对2种支护参数进行数值分析和比较优化,确定了2214回风巷最优支护参数设计,即高强让压锚索锚喷联合工字钢棚的主被动联合支护技术。
To study the stability and width optimization design of narrow coal pillars along the goaf of fully mechanized caving face in inclined seam,based on the analysis of the mine pressure around the coal pillars along the roadway and the empirical formula of the reasonable coal pillar width(5.61～12.46 m)of retaining roadway,FLAC~(3D)simulation software was used to conduct numerical analysis and comparison of the stress field,displacement field and plastic zone distribution between the four coal pillar widths of 6,8,10 and 12 m without support.The result shows that the optimal retaining coal pillar width is 8.0 m.Therefore,based on the determination of the optimal retaining coal pillar width,the numerical analysis and comparison of the two supporting parameters are carried out by FLAC~(3D),and the optimum supporting parameter design of the 2214 return airway is determined,that is active and passive combined support technology of high strength anchoring cable and shotcreting I-beam shed.
To study the stability and width optimization design of narrow coal pillars along the goaf of fully mechanized caving face in inclined seam,based on the analysis of the mine pressure around the coal pillars along the roadway and the empirical formula of the reasonable coal pillar width(5.61～12.46 m)of retaining roadway,FLAC~(3D)simulation software was used to conduct numerical analysis and comparison of the stress field,displacement field and plastic zone distribution between the four coal pillar widths of 6,8,10 and 12 m without support.The result shows that the optimal retaining coal pillar width is 8.0 m.Therefore,based on the determination of the optimal retaining coal pillar width,the numerical analysis and comparison of the two supporting parameters are carried out by FLAC~(3D),and the optimum supporting parameter design of the 2214 return airway is determined,that is active and passive combined support technology of high strength anchoring cable and shotcreting I-beam shed.
引文
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[2]柏建彪.沿空掘巷围岩控制[M].徐州:中国矿业大学出版社,2006:13-62.
[3]李学华,姚强岭,丁效雷.护巷煤柱沿空掘巷围岩稳定原理与技术[J].煤矿支护,2008(2):1-9.
[4]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,2003:218-226.
[5]林东才.综放回采巷道断层防水煤柱留设优化研究[J].煤矿安全,2014,45(9):28-31.
[6]张科学,张永杰,马振乾.沿空掘巷护巷煤柱宽度确定[J].采矿与安全工程学报,2015,32(3):447-452.
[7]张元超,杨圣奇,陈淼.深井综放沿空掘巷实体煤帮变形破坏机制及控制技术[J].岩土力学,2017,38(4):1104-1112.
[8]张科学.高瓦斯煤层巷道布置及控制技术研究[D].徐州:中国矿业大学,2012.
[9]臧宝军.蔚州矿区单侯矿近距离煤层群区段煤柱[J].煤矿安全,2014,45(1):218-221.
[10]柏建彪,侯朝炯,黄汉富.沿空掘巷护巷煤柱稳定性数值模拟研究[J].岩石力学与工程报,2004,23(20):3475-3479.
[11]王卫军,侯朝炯,李学华.老顶给定变形下综放沿空掘巷合理定位分析[J].湘潭矿业学院学报,2001,16(2):1-4.
[12]张农,李学华,高明仕.迎采动工作面沿空掘巷预拉力支护及工程应用[J].岩石力学与工程学报,2004,23(12):2100-2105.
[13]华心祝,刘淑,刘增辉.孤岛工作面沿空掘巷矿压特征研究及工程应用[J].岩石力学与工程学报,2011,30(8):1646-1651.
[14]陆士良,郭育光.护巷煤柱宽度与巷道围岩变形的关系[J].中国矿业大学学报,1991,20(4):1-7.
[15]张东升,王红胜.预筑人造帮置换窄煤柱的二步骤沿空掘巷新技术[J].煤炭学报,2010,35(10):1589.