煤层瓦斯流动规律与煤的孔隙结构密切相关。为揭示贵州地区突出煤层微观孔隙结构特征及对其瓦斯流动特性的影响，以贵州地区6个典型矿井突出煤层为研究对象，采用高压容量法测试了6个煤样的吸附能力。同时，根据高压压汞试验，利用分形方法获得煤样分形维数，并分析样品的微观孔隙结构分形特征及其与煤质参数的关系。在此基础上，探讨多尺度孔隙中瓦斯流动规律，分析吸附作用对瓦斯流动特性的影响。结果表明，贵州突出煤层以微孔为主，微孔为比表面积和孔隙体积的主要贡献者。同一煤样微孔分形维数D1、小孔分形维数D2和中孔分形维数D3依次增大，且分形特征明显。D1和综合分形维数Dk与水分呈负相关，挥发分与D2、D3呈负相关，灰分和D3呈负相关。突出煤层中瓦斯扩散模式主要为Knudsen型和过渡型。在Knudsen扩散区和过渡扩散区，渗透率受温度和压力影响较小；Fick扩散区，在相同Kn和温度条件下，渗透率随压力增大而减小，随温度增高而降低；压力越高，孔径越小，渗透率受吸附作用影响越大

The gas flow law of coal seam is closely related to the pore structure of coal. In order to reveal the micropore structure characteristics of outburst coal s eams in Guizhou and its effect on gas flow,six outburst coal seams in typical mines in Guizhou Area were taken as the research objects, and the adsorption capacity of s ix coal samples was tested by the high pressure capacity method. At the same time, according to the high-pressure mercury test,the fractal dimension of the coal sample was obtained by the fractal method,and the fractal characteristics of the micropore structure of the coal and its relationship with the coal material composition were anal yzed. On this basis,the law of gas flow in multi-scale pores was discussed, and the effect of adsorption on gas flow was analyzed. The results show that Guizhou outbur st coal seams are dominated by micropores,which are the main contributors to the specific surface area and pore volume. The micropore fractal dimension D1 ,small por e fractal dimension D2 and mesopore fractal dimension D3 of the same coal sample increase sequntially,and the fractal characteristics are obvious. D1 and the integra ted fractal dimension Dkare negatively correlated with moisture,the volatile matter is negatively correlated with D2 and D3,and the ash yield is negatively correlated with D3. The gas diffusion mode in outburst coal is mainly Knudsen type and transition type. In the Knudsen difusion zone and transition difusion zone,the permeabllity is le ss affected by temperature and pressure; in the Fick diffusion zone,under the same Knudsen number( Kn) and temperature,the permeability decreases with increasing p ressure and decreases with increasing temperature. The higher the pressure,the smaller the pore size,and the more the permeability is affected by adsorption.