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为解决深井煤巷厚层复合顶板的整体下沉问题,分析了巷道围岩力学机理并提出了控制技术.采用现场调查和理论分析方法研究了深井煤巷厚层复合顶板岩层的结构特点和力学性质,以及整体下沉的主要原因,认为该类型顶板具有厚度大、力学强度低、软弱分层多等特点,而锚索的整个有效锚固长度并没有深入到承载强度较高的岩层中,出现了垮落层带、离层裂隙层带和弯曲层带的“小三带”变形分布区域,形成了“顶板-两帮”和“顶板-小煤柱”的不稳定循环系统,由此,提出了以“预应力大刚度桁架锚索梁”为核心的综合控制技术.现场试验表明:进行以“预应力大刚度桁架锚索梁”为核心技术支护后的煤巷明显好于原支护煤巷(为锚杆和锚索联合支护),较原支护煤巷的顶底板总移近量少了541mm.
In order to solve the problem of the whole subsidence of the thick composite roof in the deep coal seam roadway, the mechanics mechanism of the surrounding rock of the roadway is analyzed and the control technology is put forward. The structural characteristics and mechanics of the thick composite roof rock strata in the deep coal seam are studied by field investigation and theoretical analysis Nature and overall sinking, the main roof of this type is considered to be characterized by large thickness, low mechanical strength and weak stratification. However, the entire effective anchorage length of the anchor cable does not penetrate into the rock with high bearing strength and appears The unstable zone of “roof” - “two gangs” and “roof - pillars” formed in the “zonal zone” deformation zone of the caving zone, delamination zone zone and bend zones System, thus, a comprehensive control technology based on “prestressed high stiffness truss cable girder ” is put forward.The field tests show that: “prestressed high stiffness truss cable girder ” as the core technology support After the coal lane was significantly better than the original support coal lane (for the bolt and anchor joint support), compared with the original support coal seam roof and floor total amount of approach 541mm less.