为研究不同变质程度煤孔隙结构分形特征及其对瓦斯吸附特性的影响，通过压汞试验测试了9组不同变质程度煤样孔隙结构，利用Menger海绵模型分析了不同变质程度煤孔隙结构分形特征，结合煤样吸附常数，研究了孔隙结构分形特征对瓦斯吸附特性的影响。研究结果表明，煤孔隙在不同孔径段具有不同的分形特征，渗流孔分形维数D₁和吸附孔分形维数D₂均随变质程度的增加呈线性增大。煤孔隙分形特征对瓦斯吸附特性具有一定的影响，渗流孔分形维数D₁与吸附常数b呈良好的线性关系，与极限吸附瓦斯量a的关联性不大，表明渗流孔分形维数D₁对吸附瓦斯速率影响较大，对吸附能力影响较小；吸附孔分形维数D₂与极限吸附量a呈正相关关系，与吸附常数b关联关系不明显，说明吸附孔分形维数D₂对瓦斯吸附能力影响较大，对吸附瓦斯速率影响不明显。

In order to study the fractal characteristics of coal pore structure with different metamorphic degrees and its effect on gas adsorption characteristics， the pore structure of nine different metamorphic coal samples were tested by mercury injection experiments.The Menger sponge model was used to analyze the fractal characteristics of coal pore structure with different metamorphism.Combined with the adsorption constant of coal samples， the influence of fractal characteristics of pore structure on gas adsorption characteristics was studied.The results show that coal pores have different fractal characteristics in different pore sizes， and the fractal dimensions D1 of seepage pores and the fractal dimension D2 of the adsorption pores increase linearly with the increase of metamorphism.Fractal characteristics of coal pores have certain influence on gas adsorption characteristics.The fractal characteristics of coal pores have a certain influence on the gas adsorption characteristics.The fractal dimension D1 of seepage pores has a good linear relationship with adsorption constant b，and has little correlation with limit adsorption gas quantity a， indicating that fractal dimension D1 of seepage pores has greater influence on gas adsorption rate and less influence on adsorption capacity.The fractal dimension D2 of the adsorption pore is positively correlated with the ultimate adsorption amount a and has no obvious correlation with the adsorption constant b， which indicates that the fractal dimension of the adsorp-tion pore D2 has an effect on the gas adsorption capacity and has no obvious influence on the gas adsorption rate.