深部矿井下山采区底板巷道跨采技术研究
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摘要
针对平煤十矿采区底板回风下山巷道工程地质条件,通过数值计算研究了深部回风下山底板巷道变形破坏严重的主要原因、跨采前后底板巷道围岩应力场和位移场以及跨采期间巷道围岩变形规律。研究结果表明,原岩应力高、围岩岩性差以及工作面采动影响,是采区回风下山巷道围岩变形失稳破坏严重的主要原因。跨采前巷道底板应力场呈"泡形"分布规律,巷道围岩最大应力集中系数为2～3;跨采后底板巷道围岩应力恢复到原岩应力。跨采期间底板巷道围岩移近量为底板巷道与跨采工作面水平距离L的单调递增函数。研究结论对于实现采煤工作面安全跨采提供了技术支撑。
Aiming at the engineering geological conditions of the floor-roadway in return-air down-dip district in No.10 mine area of Pingdingshan Coal Mine,the main causes of serious deformation and destruction of the floor-roadway in return-air down-dip district,the stress and displacement fields of the surrounding rock before and after mining across the roadway,as well as the deformation law of the roadway during mining were studied by numerical calculation.The results showed that the high stress of original rock,the poor lithology of surrounding rock and the mining influence of working face were the main reasons for the serious deformation and instability of surrounding rock of the floor-roadway in return-air down-dip district.The distribution law of stress field in floor-roadway before mining across the roadway was a bubble shape,the maximum stress concentration factor of surrounding rock was 2～3,and the stress of surrounding rock in roadway would be restored to the original rock stress after mining across the roadway.During the period of mining across the roadway,the amount of surrounding rock movement of floor roadway presented a monotone increasing function of the horizontal distance L between floor-roadway and Mining across the roadway working face.The research conclusion could provide a technical support for realizing safe cross mining in coal working face.
Aiming at the engineering geological conditions of the floor-roadway in return-air down-dip district in No.10 mine area of Pingdingshan Coal Mine,the main causes of serious deformation and destruction of the floor-roadway in return-air down-dip district,the stress and displacement fields of the surrounding rock before and after mining across the roadway,as well as the deformation law of the roadway during mining were studied by numerical calculation.The results showed that the high stress of original rock,the poor lithology of surrounding rock and the mining influence of working face were the main reasons for the serious deformation and instability of surrounding rock of the floor-roadway in return-air down-dip district.The distribution law of stress field in floor-roadway before mining across the roadway was a bubble shape,the maximum stress concentration factor of surrounding rock was 2～3,and the stress of surrounding rock in roadway would be restored to the original rock stress after mining across the roadway.During the period of mining across the roadway,the amount of surrounding rock movement of floor roadway presented a monotone increasing function of the horizontal distance L between floor-roadway and Mining across the roadway working face.The research conclusion could provide a technical support for realizing safe cross mining in coal working face.
引文
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[4]魏世义,镐振,郜进海.高水平应力跨采巷道围岩控制技术[J].煤矿安全,2013,44(9):116-119.
[5]李桂臣,马振乾,张农,等.淮北矿区多次跨采巷道破坏特征及控制对策研究[J].采矿与安全工程学报,2013,30(2):181-187.
[6]宋召谦,王振伟,车明.近距离跨采影响底板软岩巷道围岩控制技术[J].煤矿安全,2014,45(10):55-57+61.
[7]孙志海,谢文兵,张佳文,等.跨采底板巷道围岩变形规律及其控制技术[J].煤炭技术,2016,35(9):65-67.
[8]庄启恒,安昌辉,华祥.跨采软岩巷道让压支护技术[J].煤炭工程,2013,45(2):91-92.
[9]黄仲文,王朋朋,马振乾.芦岭矿特厚煤层综放采动下底板巷道控制技术[J].煤矿安全,2013,44(3):99-102.
[10]李仕明,翟新献,刘中云,等.跨采时底板巷道围岩变形预测[J].矿山压力与顶板管理,2005,22(4):56-57.
[11]郭奇峰,冀东.平煤十矿地应力场测试技术研究[J].煤炭科学技术,2012,40(2):12-14.
[12]孙猛.平顶山矿区地应力规律及其应用研究[D].徐州:中国矿业大学,2014.
[13]翟新献,杨小林,曾宪桃.暗斜井变形破坏与煤柱之间关系[J].矿冶工程,2003,23(2):20-22.
[14]杜计平,姜学云,钱鸣高,等.有效载荷系数KγH/σ在孙村煤矿深部开采中的应用[J].岩石力学与工程学报,1994,13(4):365-373.