基本顶断裂位置条件下沿空留巷充填体参数确定

沿空留巷基本顶断裂位置对充填体所需提供支撑力有很大影响,基于砌体梁理论,建立3种沿空留巷基本顶断裂结构力学分析模型,采用梁体挠度计算方法,得出充填体所需支撑力随开采深度、留巷巷道宽度、充填宽度的增加而增大;基本顶在采空区侧断裂充填体所需提供支撑力最小,沿空留巷围岩稳定性较易控制;基本顶在巷道上方或煤壁侧断裂,所需充填体支撑力较大;在靠近岩块A和岩块B的断裂位置处进行充填,有利于降低充填体需要提供的支撑力,并将研究成果在潘村煤矿1301工作面进行现场试验,沿空留巷取得成功。

Fillings Parameters Determine in Gob-side Entry Retaining from Fracture Position of Main Roof

Fillings force was influenced by fracture line of main roof in gob-side entry retaining. Based on voussoir beam, three kinds of structure models were established, and through calculating deflection of beam, fillings force changed with depth of mining, width of roadway and fillings were found. Force was minimum with fracture line of main roof in goaf, surrounding rock was easy to be controlled; Force was bigger with fracture line of main roof upper roadway or in coal wall. Force was reduced with fillings was arranged where the fraction of rock A and rock B. Field experiment was done in 1301 work face from Panchun coal with the achievements, gob-side entry retaining was successful.