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煤层气开发、煤与瓦斯共采、煤层注水预防煤与瓦斯突出等工程应用研究均与煤层的渗透性密切相关,研究煤层的渗透率及其影响因素具有重要的工程意义.首先介绍了煤层的结构特征,总结了煤层渗透性的主要影响因素及测试方法;然后从煤层渗透率对地应力、有效应力、围压、轴压等因素的敏感性出发,阐述了煤层渗透率气测法的试验研究现状;最后指出:考虑到一般煤层的隔水性能,煤样渗透率水测法的研究成果较少,而气测法的试验成果相对丰富.
CBM development, coal and gas co-mining, coal seam water injection to prevent coal and gas outburst and other engineering applications are closely related to the permeability of coal seams, study the permeability of coal seams and its influencing factors has important engineering significance.First of all, Structural characteristics, the main influencing factors and testing methods of coalbed permeability are summarized. Based on the sensitivity of coalbed permeability to earth stress, effective stress, confining pressure and axial pressure, the experiment on gas permeability of coalbed permeability Finally, the author points out that considering the water-barrier properties of coal seams, there are few researches on the permeability of coal samples and the experimental results of gas-sensing methods are relatively abundant.