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随着矿井开采深度的增加,地应力、瓦斯压力、煤体特性等因素的变化对瓦斯渗流的影响越来越明显。根据钻孔抽放瓦斯的渗流特性与固体变形的基本理论,引入了固体力学和多孔介质流耦合的控制方程,同时考虑了分子滑脱效应对渗流的影响。建立了考虑抽放钻孔在不同的地应力、不同初始渗透率和不同抽放负压条件下,瓦斯运移与煤体变形相耦合作用的数学模型。通过研究钻孔抽放瓦斯过程中,在不同地应力和瓦斯压力的影响下,得出煤层渗透率和瓦斯运移的变化规律。
With the increase of mining depth, the influence of the changes of geostress, gas pressure and coal characteristics on gas seepage is more and more obvious. According to the seepage characteristics of drilling drainage gas and the basic theory of solid deformation, the governing equations governing the coupling of solid mechanics and porous media are introduced, and the influence of molecular slippage on seepage is also considered. A mathematical model was established to consider the coupling between gas migration and coal deformation under different ground stress, different initial permeability and different suction pressure. Through studying the process of gas drainage in borehole, the variation rules of coalbed permeability and gas migration are obtained under the influence of different local stress and gas pressure.