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基于目前煤矿常见的倾斜、特别是急倾斜煤层沿顶掘进回采巷道上帮经常出现支护困难,片帮严重的现象.利用毕肖普算法,建立了上帮煤体失稳模型,推导出上帮煤体稳定性安全系数的计算公式,将理论研究成果应用于某矿大倾角煤层掘进中煤巷.结果表明:该条件下,上帮煤体临界失稳路径为半径19.8 m,圆心距下帮水平距离为13.3 m的滑移面,巷道上帮到临界失稳滑移面的最大水平距离为2.12 m.
Based on the common inclinations in coal mines, especially in steeply inclined coal seams, it is often difficult to support and help the top gangway along the roadway with top-digging excavation.Based on the Bishop method, The calculation formula of the stability coefficient of coal body stability is used to apply the theoretical research results to the coal roadway in the mining of high-angle coal seam in a mine.The results show that under this condition the critical instability path of coal gangue is 19.8 m radius, The horizontal distance is 13.3 m, and the maximum horizontal distance from the roadway up to the critical slip surface is 2.12 m.