近距离煤层开采巷道布置合理性分析
|
摘要
以界沟煤矿8_220工作面机巷为研究对象,针对7_220工作面回采造成8_220机巷顶板不稳定的情况,运用极限平衡理论和弹性力学理论对煤柱一侧塑性区宽度和上位煤层底板应力分布规律进行研究。结果表明,7~#煤煤柱一侧塑性区宽度x_0为21.1 m,上位煤层开采后,原岩应力平衡状态被打破,在煤壁附近区域出现了应力集中区和卸压区。底板最大破坏深度h_(max)为15.91m,由塑性区宽度得出煤层底板最大破坏深度与煤壁的水平距离为7.41 m,采空区底板破坏区沿水平方向的最大距离为84.3 m。根据7~#煤层采空区左侧煤壁与8~#煤层回采巷道顶板中心线的相对位置不同,提出4套布置方案,通过综合分析,当煤壁与回采巷道顶板中心线距离为22 m时,回采巷道受力较小且均匀,塑性区分布不大,围岩变形量也很小,为最佳布置方案。
Aiming at the unstable roof of 8_220 machine roadway in 7_220 face of Jiegou Coal Mine,the width of plastic zone on one side of coal pillar and the stress distribution law of upper coal seam floor are studied by using limit equilibrium theory and elasticity mechanics theory.The results show that the width of plastic zone on one side of 7~#coal pillar is 21.1 m.After mining of the upper coal seam,the stress balance state of the original rock is broken,and the stress concentration area and pressure relief area appear near the coal wall.The maximum damage depth h_(max)of floor is 15.91 m,the maximum damage depth of floor is 7.41m from the horizontal distance of coal wall and 84.3 m from the horizontal direction of floor damage area of goaf.According to the relative position of the left coal wall of the goaf in 7~#coal seam and the central line of the roof of the mining roadway in 8~#coal seam,four sets of layout schemes are proposed.Through comprehensive analysis,when the distance between the coal wall and the central line of the roof of the mining roadway is 22 m,the stress of the mining roadway is small and even,the distribution of the plastic zone is small,and the deformation of the surrounding rock is also small.
Aiming at the unstable roof of 8_220 machine roadway in 7_220 face of Jiegou Coal Mine,the width of plastic zone on one side of coal pillar and the stress distribution law of upper coal seam floor are studied by using limit equilibrium theory and elasticity mechanics theory.The results show that the width of plastic zone on one side of 7~#coal pillar is 21.1 m.After mining of the upper coal seam,the stress balance state of the original rock is broken,and the stress concentration area and pressure relief area appear near the coal wall.The maximum damage depth h_(max)of floor is 15.91 m,the maximum damage depth of floor is 7.41m from the horizontal distance of coal wall and 84.3 m from the horizontal direction of floor damage area of goaf.According to the relative position of the left coal wall of the goaf in 7~#coal seam and the central line of the roof of the mining roadway in 8~#coal seam,four sets of layout schemes are proposed.Through comprehensive analysis,when the distance between the coal wall and the central line of the roof of the mining roadway is 22 m,the stress of the mining roadway is small and even,the distribution of the plastic zone is small,and the deformation of the surrounding rock is also small.
引文
[1]张百胜.极近距离煤层开采围岩控制理论及技术研究[D].太原:太原理工大学,2008.
[2]郑勇.澄合矿区极近距离煤层群开采回采巷道布置研究[D].西安:西安科技大学,2013.
[3]姜鹏飞,康红普,张剑,等.近距煤层群开采在不同宽度煤柱中的传力机制[J].采矿与安全工程学报,2011,28(3):345-349.
[4]刘宗柱.近距离煤层群下煤层回采巷道布置及围岩控制技术研究[D].徐州:中国矿业大学,2014.
[5]张金才,张玉卓,刘天泉.岩体渗流与煤层底板突水[M].北京:地质出版社,1997.
[6]王作字,刘鸿泉.承压水上采煤[M].北京:煤炭工业出版社,1993.
[7]孙建.沿煤层倾斜方向底板“三区”破坏特征分析[J].采矿与安全工程学报,2014,31(1):115-121.
[8]郭帅.近距离煤层同采工作面合理错距及矿压显现研究[D].太原:太原理工大学,2013.
[9]郑新旺.近距离煤层采空区下底板破坏特征及影响分析[D].焦作:河南理工大学,2011.
[10]刘宗柱.近距离煤层群下煤层回采巷道布置及围岩控制技术研究[D].徐州:中国矿业大学,2014.
[11]顾天州.界沟煤矿近距离煤层采空区下回采巷道布置与支护技术研究[D].徐州:中国矿业大学,2016.
[12]耿宏波,叶义成,罗斌玉.深部采场工作面围岩应力分布规律及围岩破坏范围研究[J].金属矿山,2018(6):11-19.
[13]李海梅,关英斌.显德汪煤矿煤层底板采动破坏效应的有限元模拟[J].煤矿设计,2002(10):38-40.
[14]赵启峰,孟祥瑞.采动过程中底板岩层变形破坏与损伤机理分析[J].煤矿安全,2008(4):12-16.
[15]冯启言,杨天鸿.基于渗流-损伤耦合分析的煤层底板突水过程的数值模拟[J].安全与环境学报,2006,6(3):1-4.
[2]郑勇.澄合矿区极近距离煤层群开采回采巷道布置研究[D].西安:西安科技大学,2013.
[3]姜鹏飞,康红普,张剑,等.近距煤层群开采在不同宽度煤柱中的传力机制[J].采矿与安全工程学报,2011,28(3):345-349.
[4]刘宗柱.近距离煤层群下煤层回采巷道布置及围岩控制技术研究[D].徐州:中国矿业大学,2014.
[5]张金才,张玉卓,刘天泉.岩体渗流与煤层底板突水[M].北京:地质出版社,1997.
[6]王作字,刘鸿泉.承压水上采煤[M].北京:煤炭工业出版社,1993.
[7]孙建.沿煤层倾斜方向底板“三区”破坏特征分析[J].采矿与安全工程学报,2014,31(1):115-121.
[8]郭帅.近距离煤层同采工作面合理错距及矿压显现研究[D].太原:太原理工大学,2013.
[9]郑新旺.近距离煤层采空区下底板破坏特征及影响分析[D].焦作:河南理工大学,2011.
[10]刘宗柱.近距离煤层群下煤层回采巷道布置及围岩控制技术研究[D].徐州:中国矿业大学,2014.
[11]顾天州.界沟煤矿近距离煤层采空区下回采巷道布置与支护技术研究[D].徐州:中国矿业大学,2016.
[12]耿宏波,叶义成,罗斌玉.深部采场工作面围岩应力分布规律及围岩破坏范围研究[J].金属矿山,2018(6):11-19.
[13]李海梅,关英斌.显德汪煤矿煤层底板采动破坏效应的有限元模拟[J].煤矿设计,2002(10):38-40.
[14]赵启峰,孟祥瑞.采动过程中底板岩层变形破坏与损伤机理分析[J].煤矿安全,2008(4):12-16.
[15]冯启言,杨天鸿.基于渗流-损伤耦合分析的煤层底板突水过程的数值模拟[J].安全与环境学报,2006,6(3):1-4.