切顶卸压自成巷巷内支护及其稳定性控制
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摘要
针对恒源煤矿2632工作面大埋深、复合、破碎顶板的工程地质条件,为保证2632机巷顺利切顶进而沿空留巷,首先建立了上覆顶板"悬臂梁+铰接岩梁"的结构模型,通过力学分析、理论计算,确定了切顶卸压下巷内支护强度,相较于小煤柱护巷,切顶能够大幅降低巷内支护强度,覆岩压力向采空区和实体煤深部转移,留巷巷道位于相对低应力区;通过数值模拟,验证了切顶对巷道围岩的卸压效果,确定了切顶的高度和角度。恒源煤矿2632工作面机巷应用切顶卸压自成巷技术后,实现了大埋深破碎顶板的沿空留巷,同时回收了500 m巷道的煤柱,下一工作面可以少掘500 m巷道。
Aiming at the engineering geological conditions for large buried depth, composite and broken roof of 2632 working face in Hengyuan Coal Mine, in order to ensure the roof cutting and gob side entry retaining of the 2632 lane, the combined structural model of cantilever beam and hinged rock beam of the overlying roof was established. Through mechanical modeling and theoretical analysis, the supporting strength of roadway under roof cutting and pressure relief is determined, it is confirmed that the required support strength of the roadway to remain stable is smaller than that of the coal pillar retaining mode, the overburden pressure was transferred to back goaf and solid coal ahead, the roadway formed by roof-cutting was located in the low stress area;the key parameters of the roof-cutting and pressure relief were confirmed by numerical simulation. After the field application of the roof-cutting and pressure relief technology in 2632 working face of Hengyuan Coal Mine, the entry with large buried depth,composite and broken roof was retained successfully, meanwhile, the coal pillars of 500 m roadway were recovered. The next working face can avoid digging 500 m roadway.
Aiming at the engineering geological conditions for large buried depth, composite and broken roof of 2632 working face in Hengyuan Coal Mine, in order to ensure the roof cutting and gob side entry retaining of the 2632 lane, the combined structural model of cantilever beam and hinged rock beam of the overlying roof was established. Through mechanical modeling and theoretical analysis, the supporting strength of roadway under roof cutting and pressure relief is determined, it is confirmed that the required support strength of the roadway to remain stable is smaller than that of the coal pillar retaining mode, the overburden pressure was transferred to back goaf and solid coal ahead, the roadway formed by roof-cutting was located in the low stress area;the key parameters of the roof-cutting and pressure relief were confirmed by numerical simulation. After the field application of the roof-cutting and pressure relief technology in 2632 working face of Hengyuan Coal Mine, the entry with large buried depth,composite and broken roof was retained successfully, meanwhile, the coal pillars of 500 m roadway were recovered. The next working face can avoid digging 500 m roadway.
引文
[1]漆泰岳,郭育光,侯朝炯.沿空留巷整体浇注护巷带适应性研究[J].煤炭学报,1999,24(3):34-38.
[2]曹帅,宋卫东,薛改利.考虑间歇充填和浓度效应的充填体长期强度试验研究[J].岩土力学,2018,39(S1):341-347.
[3]韩斌,张升学,邓建,等.基于可靠度理论的下向进路充填体强度确定方法[J].中国矿业大学学报,2006,35(3):372-376.
[4]李迎富,华心祝.沿空留巷上覆岩层关键块稳定性力学分析及巷旁充填体宽度确定[J].岩土力学,2012,33(4):1134-1140.
[5]李迎富,华心祝.二次沿空留巷关键块的稳定性及巷旁充填体宽度确定[J].采矿与安全工程学报,2012,29(6):783-789.
[6]柏建彪,周华强,侯朝炯,等.沿空留巷巷旁支护技术的发展[J].中国矿业大学学报,2004,33(2):183.
[7]权凯,刘治成,徐向阳,等.固体充填采煤沿空留巷顶板下沉力学机理研究[J].煤炭科学技术,2018,46(3):33-38.
[8]潘俊锋,王书文,刘少虹,等.双巷布置工作面外围巷道冲击地压启动机理[J].采矿与安全工程学报,2018,35(2):291-298.
[9]何满潮,王亚军,杨军,等.切顶卸压无煤柱自成巷开采与常规开采应力场分布特征对比分析[J].煤炭学报,2018,43(3):626-637.
[10]孙晓明,刘鑫,梁广峰,等.薄煤层切顶卸压沿空留巷关键参数研究[J].岩石力学与工程学报,2014,33(7):1449-1456.
[11]孟秀峰,赵洪亮.综放工作面水力压裂顶板控制技术研究[J].煤炭工程,2017,49(7):75-77.
[12]汪东.低渗煤层“切槽-压裂”卸压增透技术研究[J].煤矿安全,2017,48(6):142-144.
[13]焦振华,王浩,卢志国,等.厚层坚硬石灰岩顶板深孔预裂爆破技术研究[J].煤炭科学技术,2017,45(2):21-26.
[14]高玉兵,何满潮,杨军,等.无煤柱自成巷空区矸体垮落规律的切顶效应试验研究[J].中国矿业大学学报,2018,47(1):1-12.
[15]何满潮,陈上元,郭志飚,等.切顶卸压自成巷围岩结构控制及其工程应用[J].中国矿业大学学报,2017,46(5):959-969.
[16]郭志飚,王将,曹天培,等.薄煤层切顶卸压自动成巷关键参数研究[J].中国矿业大学学报,2016,45(5):879-885.
[17]马资敏,郭志飚,陈上元,等.深部中厚煤层切顶留巷围岩变形规律与控制研究[J].煤炭科学技术,2018,46(2):112-118.
[18]何满潮,高玉兵,杨军,等.无煤柱自成巷聚能切缝技术及其对围岩应力演化的影响研究[J].岩石力学与工程学报,2017,36(6):1314-1325.
[2]曹帅,宋卫东,薛改利.考虑间歇充填和浓度效应的充填体长期强度试验研究[J].岩土力学,2018,39(S1):341-347.
[3]韩斌,张升学,邓建,等.基于可靠度理论的下向进路充填体强度确定方法[J].中国矿业大学学报,2006,35(3):372-376.
[4]李迎富,华心祝.沿空留巷上覆岩层关键块稳定性力学分析及巷旁充填体宽度确定[J].岩土力学,2012,33(4):1134-1140.
[5]李迎富,华心祝.二次沿空留巷关键块的稳定性及巷旁充填体宽度确定[J].采矿与安全工程学报,2012,29(6):783-789.
[6]柏建彪,周华强,侯朝炯,等.沿空留巷巷旁支护技术的发展[J].中国矿业大学学报,2004,33(2):183.
[7]权凯,刘治成,徐向阳,等.固体充填采煤沿空留巷顶板下沉力学机理研究[J].煤炭科学技术,2018,46(3):33-38.
[8]潘俊锋,王书文,刘少虹,等.双巷布置工作面外围巷道冲击地压启动机理[J].采矿与安全工程学报,2018,35(2):291-298.
[9]何满潮,王亚军,杨军,等.切顶卸压无煤柱自成巷开采与常规开采应力场分布特征对比分析[J].煤炭学报,2018,43(3):626-637.
[10]孙晓明,刘鑫,梁广峰,等.薄煤层切顶卸压沿空留巷关键参数研究[J].岩石力学与工程学报,2014,33(7):1449-1456.
[11]孟秀峰,赵洪亮.综放工作面水力压裂顶板控制技术研究[J].煤炭工程,2017,49(7):75-77.
[12]汪东.低渗煤层“切槽-压裂”卸压增透技术研究[J].煤矿安全,2017,48(6):142-144.
[13]焦振华,王浩,卢志国,等.厚层坚硬石灰岩顶板深孔预裂爆破技术研究[J].煤炭科学技术,2017,45(2):21-26.
[14]高玉兵,何满潮,杨军,等.无煤柱自成巷空区矸体垮落规律的切顶效应试验研究[J].中国矿业大学学报,2018,47(1):1-12.
[15]何满潮,陈上元,郭志飚,等.切顶卸压自成巷围岩结构控制及其工程应用[J].中国矿业大学学报,2017,46(5):959-969.
[16]郭志飚,王将,曹天培,等.薄煤层切顶卸压自动成巷关键参数研究[J].中国矿业大学学报,2016,45(5):879-885.
[17]马资敏,郭志飚,陈上元,等.深部中厚煤层切顶留巷围岩变形规律与控制研究[J].煤炭科学技术,2018,46(2):112-118.
[18]何满潮,高玉兵,杨军,等.无煤柱自成巷聚能切缝技术及其对围岩应力演化的影响研究[J].岩石力学与工程学报,2017,36(6):1314-1325.