摘要
选取薛村煤矿厚煤层大断面1927运输巷为研究对象,采用FLAC3D模拟研究了巷宽对围岩的影响,结果表明:顶、底、两帮塑性区呈"半椭圆"状分布,随巷宽增加,顶板的塑性区破坏范围增加速率最大,两帮次之、底板最小;巷道围岩变形破坏向深入逐渐降低,深部破坏变形曲线呈"负指数"形式;巷道顶板表面变形量及变形增加量最大,两帮次之、底板最小;帮支承压力呈浅部升高深部降低的趋势,支承压力峰值随巷宽增加向深部转移。从而得出:桁架锚索可锚固在肩角稳定区,封闭结构可兜护顶板;桁架锚索、锚固空间附加应力网,可有效加提高围岩共同承载能力,共同抵抗变形。基于此提出高强高预紧力锚杆与桁架锚索联合支护技术。工程实践结果显示,两帮移近量98 mm,顶底板移近量128 mm,顶板离层量3 mm。
Thick coal seam No.1927 railway roadway with large section of Xuecun Coal Mine was selected as the research object.Response characteristic of surrounding rock with different wdith was analyzed by FLAC3D.The results showed that:Plastic zone areas in roof,floor and two sides are all distributed as"semi-ellipse"increasing rate of plastic zone areas and depth with the width increasing:roof>two sides>floor;The displacement curve in roof,floor and two sides appear a index decrease to depth.Displacement of The same depth,surface and increasing amount:roof>two sides>floor;Abument pressure increases in shallow part and decrease in depth and the peak move into depth.It is considered that:Truss and anchor rope could be anchored in the shoulder stable region,could hold the roof.The ability of bearing and preventing deformation by interaction space frame structure produced by truss and anchor rope combine cable.Base on this timely support technology of high strength and high pre-stressing bolt&net&truss cable was proposed.Engineering practice results:the nearer value of two sides was 98 mm,the nearer value of roof and floor was 128 mm and abscission layer value of roof was 3 mm.
作者
刘炳权
Liu Bingquan(Faculty of Resources&Safety Engineering'China University of Mining&Technology(Beijing),Beijing 100083,China)
出处
《能源与环保》
2018年第3期180-184,188,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
关键词
厚煤层
大断面
煤巷
支护
桁架锚索
thick coal seam
large section
coal roadway
supporting
truss and anchor rope
