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根据瓦斯渗流与煤体变形的基本理论,引入煤体变形过程中应力、损伤与透气性演化的耦合作用方程,建立了含瓦斯煤岩破裂过程固气耦合作用模型。应用该模型模拟分析了深部采动影响下瓦斯抽放过程中煤层透气性的演化和抽放孔周围瓦斯压力的变化规律,认清了开采卸压瓦斯瞬态渗流的力学机制。模拟结果表明,采动影响使得处于其上部67m的煤层卸压,透气系数增大了2000多倍,卸压范围70m左右,同现场实际观测结果比较吻合。这对于进一步深入理解开采过程远程卸压瓦斯渗透性的演化、瓦斯抽放渗流的机制具有重要的理论和实践意义。
According to the basic theory of gas seepage and coal deformation, the coupling action equation of stress, damage and permeability evolution during the deformation process of coal is introduced, and the model of solid-gas coupling is established. The model was used to simulate and analyze the evolution of coal seam gas permeability and the variation of gas pressure around the drainage hole during gas drainage under the influence of deep mining. The mechanics mechanism of mining transient pressure seepage was studied. The simulation results show that the influence of mining can make the coal seam in the upper 67m depressurized, the air permeability coefficient increased more than 2000 times and the relief pressure range is about 70m, which is in good agreement with the actual observation results in the field. This is of great theoretical and practical significance for further understanding of the evolution of gas permeability and gas drainage due to remote relief during the mining process.