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为了揭示条带开采顶板岩层破坏失稳机理,通过建立均布荷载下连续深梁力学结构模型,得出了条带开采下顶板岩层的应力分布规律。同时确立了岩层拉伸破坏、剪切破坏准则,为条带开采覆岩移动破坏分析提供了理论依据。结合虎龙沟煤矿开采实际,对8#煤层采空区顶板岩层的破坏失稳过程进行了具体计算分析,得出虎龙沟煤矿8#煤层采空区冒落高度为3.5 m,为条带开采顶板稳定性预测分析提供了依据。
In order to reveal the instability mechanism of roof rock failure in strip mining, the stress distribution law of roof rock strata under strip mining was obtained by establishing the model of continuous deep beam under uniform load. At the same time, the criterion of tensile failure and shear failure of rock strata is established, which provides a theoretical basis for the analysis of the movement and failure of overlying strata in strip mining. Combining with the actual mining of Hulonggou coal mine, the failure and instability process of the roof strata in the gob roof of 8 # coal seam are calculated and analyzed. The result shows that the height of the gob of 8 # seam in Hulongou coal mine is 3.5 m, Mining roof stability prediction and analysis provide the basis.