Research on Roof Stability Control and Countermeasures of Weak Thick Coal Seam in Large Section Roadway
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摘要: 以王家岭煤矿20322胶带巷受小断层构造影响发生冒顶事故为工程背景，现场调研了冒顶区垮落前顶板变形破坏特征，以及顶板垮落后垮落带高度特征，在此基础上应用RFPA数值模拟软件分析了不同岩性顶板的离层情况。分析结果表明:随着顶板强度和刚度增大，顶板稳定性显著增强。提出利用高预应力多锚索桁架系统控制顶板结构稳定性技术，并从力学角度分析了其控制效果与合理的支护参数。现场实施“多锚索—钢筋组合圈梁”对称支护方案后，选取顶板较为破碎的6个地点进行矿压观测，结果表明顶板控制效果良好。Abstract: Taking the roof fall accident caused by small fault structure in 20322 belt roadway in Wangjialing Coal Mine as the engineering background，field investigation was carried out on the the roof deformation and failure characteristics before the roof fall and the characteristics of the fall zone height after the roof fall，and based on this，analysis was made on the bed separation of the roof with different lithology by using RFPA numerical software．The analysis results showed that with the increase of the roof strength and stiffness，the roof stability was significantly improved．The technology of using the high prestressed multi－cable truss system to control the roof stability was proposed and analysis was carried out on its control effect and rational support parameters from the angle of mechanics．After the implementation of the symmetric support scheme by“multibeam anchor cable reinforced composite”，6 places where the roof was rather broken were selected for strata control observation，the observation results showed that the roof control effect was good．
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Keywords:
- thick seam /
- roof stability /
- roof fall /
- fault structure /
- RFPA numerical simulation /
- cable truss /
- strata control observation
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