寸草塔二矿厚硬顶板回采巷道锚索超前主动支护研究

    Study on advance active support of anchor cable in mining roadway with thick hard roof in Cuncaota No.2 Coal Mine

    • 摘要: 煤矿传统单体被动超前支护的形式存在巷道断面通风面积减小、工人劳动强度大等问题。本文基于寸草塔二矿地质条件,通过现场调研、理论分析、数值模拟等手段对锚索超前主动支护可行性进行分析,并在31205工作面主运顺槽取得成功应用。研究结果表明:寸草塔二矿顶板较厚,强度较高,巷道掘进后顶板完整性好,松动圈发育不明显,为主动支护提供了良好的地质基础。提出了“锚网索一次支护+超前段顶板长锚索主动补强支护”的超前支护形式。结合物理力学模型计算法计算得到巷道超前主动支护力应不小于200 kN。超前主动补强锚索预紧力为200 kN,长度为8 m,巷中单列布置,排距2 100 mm时支护效果良好,且满足理论计算强度要求。工作面超前应力影响段顶底板最大移近量为21 mm,两帮最大移近量为23 mm,顶板最大离层量为6 mm,锚索应力变化范围为1~11 kN,巷道整体控制效果较好,锚索受采动影响不大。研究成果可为类似条件矿井回采巷道超前主动支护技术应用提供依据。

       

      Abstract: The traditional single passive advanced support in coal mine has some problems, such as the ventilation area of roadway section is reduced and the labor intensity of workers is high. Based on the geological conditions of Cuncaota No.2 Coal Mine, this paper analyzes the feasibility of anchor cable advanced active support by means of field investigation, theoretical analysis and numerical simulation, and has been successfully applied in the main transportation gateway of 31205 working face. The research results show that the roof of Cuncaota No.2 Coal Mine is thick and has high strength. After roadway excavation, the roof integrity is good, and the development of loose zone is not obvious, which provides a good geological foundation for active support. The advanced support form of “one-time support with anchor net and cable+active reinforcement support with long anchor cable in super front roof” is put forward. Combined with the physical and mechanical model calculation method, it is calculated that the advanced active supporting force of roadway should be not less than 200 kN. The pre-tightening force of the pre-active reinforcement anchor cable is 200 kN, the length is 8 m, and the supporting effect is good when the roadway is arranged in a single row and the row spacing is 2 100 mm, which meets the requirements of theoretical calculation strength. The maximum displacement of the roof and floor in the section affected by the advance stress of the working face is 21 mm, the maximum displacement of the two sides is 23 mm, the maximum displacement of the roof is 6 mm, and the stress variation range of the anchor cable is 1-11 kN. The overall control effect of the roadway is good, and the anchor cable is not affected by mining. The research results can provide a basis for the application of advanced active support technology in mining roadway in similar conditions.

       

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