变厚煤层沿空留巷支护技术
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摘要
为解决变厚煤层沿空留巷支护措施单一造成的支护效果不如意及支护成本不合理问题,通过理论分析确定了该类巷道采高较高时从巷内、巷旁和辅助支护进行强化,采高较低时采用以巷内强化支护为主,辅助支护为辅的支护策略;提出顶板强化、充填体加固、超前和滞后强化支护和高预紧力等措施,并进行现场工业性设计和试验。结果表明:工作面推过140 m后,巷道变形趋于稳定;顶底板最大移近量158 mm,两帮最大移近量199 mm,有效控制了围岩变形。
To solve the problems of unsatisfactory supporting effect and unreasonable supporting cost caused by single supporting measure for gob-side entry retaining in thickened coal seam, it is determined through theoretical analysis that such roadway should be strengthened from in-roadway, roadside and auxiliary support when mining height is high, and that in-roadway strengthened support should be adopted mainly and auxiliary support should be supplemented when mining height is low. Measures such as roof strengthening, filling body reinforcement, advanced and delayed strengthening support and high pre-tightening force are proposed, and on-site industrial design and test are carried out. The results show that the deformation of roadway tends to be stable after working face is advanced of 140 m, the maximum approaching amount of roof and floor is 158 mm, and the maximum approaching amount of two sides is 199 mm, which effectively controls the deformation of surrounding rock.
To solve the problems of unsatisfactory supporting effect and unreasonable supporting cost caused by single supporting measure for gob-side entry retaining in thickened coal seam, it is determined through theoretical analysis that such roadway should be strengthened from in-roadway, roadside and auxiliary support when mining height is high, and that in-roadway strengthened support should be adopted mainly and auxiliary support should be supplemented when mining height is low. Measures such as roof strengthening, filling body reinforcement, advanced and delayed strengthening support and high pre-tightening force are proposed, and on-site industrial design and test are carried out. The results show that the deformation of roadway tends to be stable after working face is advanced of 140 m, the maximum approaching amount of roof and floor is 158 mm, and the maximum approaching amount of two sides is 199 mm, which effectively controls the deformation of surrounding rock.
引文
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[14]陈勇,柏建彪,王襄禹,等.沿空留巷巷内支护技术研究与应用[J].煤炭学报,2012,37(6):903-910.
[15]张国华.主动支护下沿空留巷顶板破碎原因分析[J].煤炭学报,2005(4):429-432.
[16]王新亚.煤矿新型沿空留巷模板支护技术及应用研究[D].北京:中国矿业大学(北京),2014.
[2]张农,韩昌良,阚甲广,等.沿空留巷围岩控制理论与实践[J].煤炭学报,2014,39(8):1635-1641.
[3]谢文兵,笪建原,冯光明.综放沿空留巷围岩控制机理[J].中南大学学报,2004,35(4):657-661.
[4]华心祝,马俊枫,许庭教.沿空留巷巷旁锚索加强支护与参数优化[J].煤炭科学技术,2004,32(8):60-64.
[5]康红普,牛多龙,张镇,等.深部沿空留巷围岩变形特征与支护技术[J].岩石力学与工程学报,2010,29(10):1977-1987.
[6]张东升,茅献彪,马文顶.综放沿空留巷围岩变形特征的试验研究[J].岩石力学与工程学报,2002,21(3):331-334.
[7]华心祝.我国沿空留巷支护技术发展现状及改进建议[J].煤炭科学技术,2006,34(12):78-81.
[8]张俊云.沿空留巷巷旁煤体作用机理及锚杆支护研究[D].西安:西安矿业学院,1998.
[9]蒋金泉.采场围岩应力与运动[M].北京:煤炭工业出版社,1993.
[10]宋宏伟,牟彬善.破裂岩石锚固组合拱承载能力及其合理厚度探讨[J].中国矿业大学学报,1997,26(2):33-35.
[11]侯朝炯,勾攀峰.巷道锚杆支护围岩强度强化机理研究[J].岩石力学与工程学报,2000,19(3):342-345.
[12]康红普,林健等.小孔径预应力锚索加固困难巷道的研究与实践[J].岩石力学与工程学报,2003,22(3):387-390.
[13]康红普,林健,吴拥政.全断面高预应力强力锚索支护技术及其在动压巷道中的应用[J].煤炭学报,2009(9):1153-1159.
[14]陈勇,柏建彪,王襄禹,等.沿空留巷巷内支护技术研究与应用[J].煤炭学报,2012,37(6):903-910.
[15]张国华.主动支护下沿空留巷顶板破碎原因分析[J].煤炭学报,2005(4):429-432.
[16]王新亚.煤矿新型沿空留巷模板支护技术及应用研究[D].北京:中国矿业大学(北京),2014.