深井软岩巷道二次锚网索支护技术

Secondary Roof Bloting with Anchor and Wire Mesh Support Technology of Soft Rock Roadway in Deep Mine

为解决超化煤矿深部软岩巷道支护难度大的问题,采用数值模拟、理论分析和现场观测相结合的方法分析了巷道原支护失稳的主要原因,被动支护不能适应深部高应力软岩巷道围岩的变形。在此基础上提出了控制深部软岩巷道围岩变形的高强稳定型二次锚网索支护技术,其中第一次高强预应力锚网支护及时加固巷道围岩,并与围岩共同形成有效承载结构,第二次锚索补强支护提高支护承载结构的稳定性和承载能力。结果表明:采用二次锚网索支护技术巷道顶底板最大移近量为73mm,两帮最大移近量仅为51 mm,顶底板平均移近速率约1.62 mm/d,两帮平均移近速率约1.13mm/d,有效控制了深井软岩巷道变形。

In order to solve the problem of deep soft rock roadway support difficultly in Chaohua Coal Mine, numerical simulation, theoretic analysis and site observation were applied to analyze the failure reasons.The deep soft rock roadway with original support was passive sup- port which couldn＇t adapt the deformation of deep soft rock roadway. Based on the analysis, secondary roof bloting with anchor and wire mesh support technology with high strength and stability was presented.The first high strength pre-stressed bloting with wire mesh support could reinforce surrounding rock in time and form high strength bearing structure with surrounding rock, the stability and load carrying ca- pacity of the beating structure was improved by secondary anchor supplement support.The results showed that secondary roof bloting with anchor and wire mesh support technology was applied to deep soft rock roadway, the maximum roof-to-floor convergence was 73 mm, the maximum rib-to-rib convergence was 51 ram, the maximum roof-to-floor convergence speed was 1.62 mm/d, the maximum fib-to-rib convergence speed was 1.13 ram/d, the deformation of deep soft rock roadway was controlled effectively.