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通过对含瓦斯煤渗透特性的实验研究,系统分析了不同应力路径下含瓦斯煤的渗透率变化规律,建立了含瓦斯煤渗透率与轴向压力、围压及瓦斯压力等之间的定性与定量关系,探讨了不同应力路径下含瓦斯煤渗透性的控制机制和变化规律。结果表明应力路径对含瓦斯煤的渗透率有着重要影响:1)含瓦斯煤渗透率随着轴向压力和围压的增加而减小,随瓦斯压力的增加而增加。2)含瓦斯煤渗透率与轴向压力、围压和瓦斯压力呈指数关系变化。3)三轴压缩下全应力-应变实验过程中,含瓦斯煤的渗透率呈“V”字型走势;渗透率随煤样的应变先减小后增大,然后达到最大值,而且渗透率的增加速率小于其减小速率。
Based on the experimental study on the permeability characteristics of gas containing coal, the variation regularity of gas permeability of coal containing gas under different stress paths was systematically analyzed. The qualitative and quantitative relationship between gas permeability and axial pressure, confining pressure and gas pressure Quantitative relationship between the different stress path of coal gas permeability control mechanism and changes in law. The results show that the stress path has an important influence on the permeability of gas containing coal: 1) The permeability of gas containing coal decreases with the increase of axial pressure and confining pressure, and increases with the increase of gas pressure. 2) The permeability of gas containing coal varies with the axial pressure, confining pressure and gas pressure exponentially. 3) During the whole stress-strain experiment under triaxial compression, the permeability of coal containing gas is in the form of “V”. The permeability decreases first and then increases with the strain of coal sample, and then reaches the maximum value, and The rate of increase of permeability is less than its rate of decrease.