密集钻孔弱化底分层顶板沿空留巷技术
Dense boreholes for weakening bottom layer by cutting roof and pressure relief of gob-side entry retaining
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摘要: 为了保证古汉山矿高应力厚煤层底分层沿空留巷工序安全顺利进行，结合再生顶板的破碎情况和瓦斯条件，通过理论分析、数值模拟试验验证了古汉山底分层沿空留巷采用密集钻孔切顶卸压的必要性；通过采用砌体梁滑移失稳条件和数值模拟试验的方法分析优化了密集钻孔的倾斜角度、深度、间距，并将此钻孔参数应用到现场工程实践中。现场留巷稳定后巷道两帮收缩量为656 mm，顶底收缩量为545 mm，能满足安全和生产的要求。Abstract: In order to ensure the safe and smooth process of gob-side entry retaining of high stress thick coal seam bottom layer in Guhanshan Coal Mine, combined with the broken condition and gas condition of the regenerated roof, the necessity of adopting dense borehole to cut roof and relieve pressure of the gob-side entry retaining roadway at the bottom layer of Guhanshan Mine is verified by theoretical analysis and numerical simulation test. The inclined angle, depth and spacing of dense drilling holes were analyzed and optimized by using the slip and instability conditions of masonry beams and numerical simulation tests. The borehole parameters are applied to the field engineering practice, and the shrinkage of both sides of the roadway is 656 mm and the shrinkage of top and bottom is 545 mm, which can meet the requirements of safety and production.
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