新元煤矿胶带大巷围岩变形与注浆加固技术

Surrounding Rock Deformation and Grouting Reinforcement for Main Roadway with Belt in Xinyuan Coal Mine

针对新元煤矿南区集中胶带大巷两帮与底板严重变形的难题,利用窥视仪对大巷帮部及底板围岩进行观察,分析大巷周围煤岩体破坏情况以及发生破坏变形的原因,基于原支护方案提出注浆+强力锚索组合加固技术,并阐述其加固机理。监测结果显示:注浆+强力锚索组合加固技术有效控制了两帮与底板的变形,两帮最大移近量为104mm,底板最大移近量为85mm,避免了大巷在生产期间的反复支护与修复。

In the main roadway with concentrated belt of the southern area of Xinyuan Coal Mine,serious deformation of two sidewalls and floor occurred.To solve the problem,borehole imaging tool was used to observe the surrounding rock of the sidewalls and floor in order to study the coal rock damage around the main roadway and the causes of the deformation.Based on the original support scheme,the grouting and intensive cable reinforcement technology was proposed and the reinforcement mechanism was expounded.The results show that grouting and intensive cable technology could effectively control the deformation of the two sidewalls and the floor.The maximum wall-to-wall convergence is 104 mm and the maximum floor convergence is 85 mm,which could avoid repeated supporting and repairing of the main roadway in the process of production.