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为了探究水力冲孔技术对突出煤层的卸压增透效果,选取典型的严重突出煤层工作面作为对象,通过分析水力冲孔对煤层增透卸压的作用机理,进而再考虑有效应力及煤体基质收缩综合作用,引起渗透率动态演化的条件下,构建了煤层瓦斯流动的气固耦合模型,利用COMSOL-Multiphysics数值模拟软件对该矿条件下水力冲孔的增透卸压的影响范围进行模拟。得到了不同冲出煤量情况下煤层瓦斯压力及地应力的分布与变化,从而确定了水力冲孔在不同出煤量时的有效半径和影响半径。
In order to explore the effect of hydraulic punching on the pressure relief and penetration enhancement of the outburst coal seam, the typical serious outburst coal seam working face is selected as the object. By analyzing the action mechanism of hydraulic punching on the seepage and pressure relief of the coal seam, the effective stress and coal Matrix contraction and the dynamic evolution of permeability, a gas-solid coupling model of gas flow in coal seam was constructed. The influence range of hydraulic penetration and pressure relief by hydraulic punching in this mine was simulated by COMSOL-Multiphysics numerical simulation software . The distribution and change of gas pressure and in-situ stress of coal seam under different outflow of coal are obtained, and the effective radius and the influence radius of hydraulic punching at different coal output are determined.