坚硬顶板沿空留巷巷旁支护技术研究.pdfVIP

学兔兔 第20卷第3期 (总第124期) 煤 矿 开 采 Vo1．20No．3(Series No．124) 2015年6月 C0AL MINING TECHNOLOGY June 2015 坚硬顶板沿空留巷巷旁支护技术研究 贾太保 (北京市安全生产监督管理局，北京100053) [摘 要] 以坚硬顶板沿空留巷为研究对象，对沿空留巷沿采空区侧坚硬顶板的破断规律进行 了研究，将其分为五区 (即垮落区、煤壁支撑区、一次破断区、二次破断区、错动离层区)和四阶段 (即形成垮落区阶段、一次破断阶段、二次破断阶段、错动离层带形成阶段)，确定设计沿空留巷最大 支护载荷主要以上覆岩层的前期活动规律为依据，设计沿空留巷最大支护变形主要以上覆岩层后期活 动规律为依据；通过对矸石墙进行抗压缩性测试和分析，研究了横向锚固矸石墙承载力变化规律，发 现横向锚固矸石墙支护的承载力较大且具有较大的让压变形特性，矸石墙的压缩量随着工作面的推进 表现出 “较小增加一缓慢增加一急剧增加一平稳不变”的规律；现场沿空留巷的巷内支护采用 “锚 杆+锚索+钢带”的方式、巷旁支护采用单体液压支柱+横向锚固矸石墙，取得了良好的经济效益和社 会效益，为坚硬顶板条件下沿空留巷的推广应用奠定了基础。 [关键词] 坚硬顶板；沿空留巷；巷旁支护；横向锚固；矸石墙 [中图分类号]TD353 [文献标识码]A [文章编号]1006—6225(2015)03-0085—04 Roadway—side Supporting Technology of Retaining Roadway along Gob under Hard Roof JIA Tai．bao (Bering Municipal Bureau of Work Safety Administration，Bering 100053，China) Abstract：Breakage of hard roof at gob-side of retaining roadway along gob was researched，five zones(caving zone，coal-wall sup- porting zone，first breakage zone，second breakage zone，diastrophism and separation zone)and four phrases(caved phrase，first breakage phrase，second breakage phrase，diastrophism and separation phrase)were divided．It was confirmed that maximum support— ing load was based on overlying strata movement rule of earlier stage and that maximum supporting deformation was based on that of lat— er stage．By testing and analyzing compression property of gangue wall，load force variation of lateral anchored gangue wall was re· searched and it was found that the load force was large put up yielding deformation characteristic．Compression amount of gangue wall took on “weakly increase--slowly increase-- abruptly increase--