近距离煤层预掘巷道应力转移技术
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摘要
针对受近距离煤层重复采动影响,常规支护体系无法控制巷道围岩变形的问题,为控制巷道变形,提出在工作面停采线附近预掘巷道并进行深孔爆破的方案。通过对预掘巷道施行"锚-让"一体支护体系,保证了卸压巷道围岩稳定,利用深孔爆破对预掘巷道顶板进行强制切顶,使卸压巷能够充分卸压,实现应力转移。采动应力在线系统监测结果表明:采动附加应力场向前传播的距离小于15 m,利用预掘卸压巷及深孔爆破对卸压巷道顶板进行强制切顶实现应力转移保护下山群巷道是可行的。
In view of the problem that the conventional support system cannot control the deformation of roadway surrounding rock due to the influence of repeated mining in close coal seams, to control the deformation of roadway, a scheme of pre-excavation of roadway near stop-mining line of working face and deep-hole blasting is proposed. Through the implementation of"anchor-yield"integrated support system for the pre-excavation roadway, the surrounding rock of the pressure relief roadway is guaranteed to be stable, and the roof of the pre-excavation roadway is forced to be cut by deep hole blasting, so that the pressure relief roadway can be fully relieved and the stress transfer can be realized. The monitoring results of online mining stress system show that the distance of the additional stress field propagated forward by mining is less than 15 m, and it is feasible to use pre-excavation pressure relief roadway and deep-hole blasting to carry out forced roof cutting on the roof of pressure relief roadway to realize stress transfer protection for the down-hill group roadway.
In view of the problem that the conventional support system cannot control the deformation of roadway surrounding rock due to the influence of repeated mining in close coal seams, to control the deformation of roadway, a scheme of pre-excavation of roadway near stop-mining line of working face and deep-hole blasting is proposed. Through the implementation of"anchor-yield"integrated support system for the pre-excavation roadway, the surrounding rock of the pressure relief roadway is guaranteed to be stable, and the roof of the pre-excavation roadway is forced to be cut by deep hole blasting, so that the pressure relief roadway can be fully relieved and the stress transfer can be realized. The monitoring results of online mining stress system show that the distance of the additional stress field propagated forward by mining is less than 15 m, and it is feasible to use pre-excavation pressure relief roadway and deep-hole blasting to carry out forced roof cutting on the roof of pressure relief roadway to realize stress transfer protection for the down-hill group roadway.
引文
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[12]周泽,朱川曲,王峰,等.预掘回撤通道应力转移技术[J].矿业工程研究,2017,32(3):51-55.
[13]何荣兴,任凤玉,丁航行,等.巷道卸压法应力迁变规律及卸压参数的确定[J].东北大学学报(自然科学版),2015,36(10):1457-1460.
[14]张伟杰,兰思栋.高应力下卸压巷道围岩破坏机理及卸压过程数值分析[J].矿冶工程,2014,34(4):34.
[15]田建胜,靖洪文.软岩巷道爆破卸压机理分析[J].中国矿业大学学报,2010,39(1):50-54.
[16]谢广祥,杨科,刘全明.综放面倾向煤柱支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545-549.
[2]柏建彪,侯朝炯.深部巷道围岩控制原理与应用研究[J].中国矿业大学学报,2006,35(2):145-148.
[3]吴建亭.深部巷道变形、破坏过程及其稳定控制技术研究[J].矿业安全与环保,2011,38(4):38-41.
[4]何富连,邹喜正,瞿群迪,等.采动软岩巷道卸压工程的设计与实践[J].矿山压力与顶板管理,2002,19(1):40-42.
[5]何富连,陈见余,邹喜正.综放沿空巷道围岩卸压控制研究[J].煤炭学报,2000,25(6):589-592.
[6]王御宇,李学锋,李向东.深部高应力区卸压开采研究[J].矿冶工程,2005,25(4):4-7.
[7]王襄禹,柏建彪,胡忠超.基于变形压力分析的有控卸压机理研究[J].中国矿业大学学报,2010,39(3):313.
[8]赵祉君,张同森.顶部卸压技术卸压参数确定及应用[J].矿山压力与顶板管理,2005,22(2):66-67.
[9]李学华,黄志增,杨宏敏,等.高应力硐室底鼓控制的应力转移技术[J].中国矿业大学学报,2006,35(3):296-300.
[10]杨敬轩,刘长友,于斌,等.工作面端头三角区沿空巷道强矿压显现与应力转移分析[J].采矿与安全工程学报,2016,33(1):88-94.
[11]郑西贵,李学华,赵立新,等.巷外掘巷保护巷道的应力转移技术[J].矿山压力与顶板管理,2005,22(4):46-50.
[12]周泽,朱川曲,王峰,等.预掘回撤通道应力转移技术[J].矿业工程研究,2017,32(3):51-55.
[13]何荣兴,任凤玉,丁航行,等.巷道卸压法应力迁变规律及卸压参数的确定[J].东北大学学报(自然科学版),2015,36(10):1457-1460.
[14]张伟杰,兰思栋.高应力下卸压巷道围岩破坏机理及卸压过程数值分析[J].矿冶工程,2014,34(4):34.
[15]田建胜,靖洪文.软岩巷道爆破卸压机理分析[J].中国矿业大学学报,2010,39(1):50-54.
[16]谢广祥,杨科,刘全明.综放面倾向煤柱支承压力分布规律研究[J].岩石力学与工程学报,2006,25(3):545-549.