近距离煤层采空区下孤岛工作面运输巷支护优化设计

Optimization design of transportation roadway support in isolated island working face under close-distance coal seam goaf

针对贺西矿近距离煤层采空区下孤岛工作面运输巷破坏机理,分析其三面临空状态下巷道支护方案形成的承载结构,针对初始支护方案进行优化设计,增加帮锚索及角锚索,形成了有效三级承载结构,锚固深度较初始支护方案增加2 m,锚索锚固深度达7.6 m,优化方案在井下应用后,对巷道围岩变形控制效果良好,顶板变形量控制在153 mm范围以内,两帮控制在126 mm以内。

In view of the failure mechanism of the transportation roadway in the isolated island working face under the close-distance coal seam goaf in Hexi Mine, the bearing structure formed by the roadway support scheme under the condition of three empty faces was analyzed. The initial support scheme was optimized, and the side anchor cables and corner anchor cables were added to form an effective three-level bearing structure. The anchoring depth was increased by 2m compared with the initial support scheme, and the anchoring depth of the anchor cables reached 7.6 m. After the underground application of the optimized scheme, the surrounding rock deformation of the roadway was well controlled, the roof deformation was controlled within 153 mm, and the two sides were controlled within 126 mm.