采用压汞法对大同和屯留煤样进行微结构测试.根据煤岩孔隙不同半径范围内累积孔隙体积分数所占的比例大小对孔隙进行了大小分类.结合孔隙结构分形维数计算原理,通过线性回归计算了各类孔隙的分形维数.结果表明用分段回归方法计算煤中不同孔隙的分形维数能较好地反映复杂的孔隙结构.小孔分维数较小,中孑和大孔分维数较大,说明中孔和大孔孔隙结构很不均匀,煤岩孔隙在这个阶段的分布离散性较大.%Micro-structure of coal samples from Datong coal mine and Tunliu coal mine were respectively detected u-sing mercury intrusion method. According to cumulative porosity percentage of pores with various radius of coal, the pores with coal were classified into three categories, namely micro-pore, mesopore and macropore. Combined the calculation principle of fractal dimension of porous structure, the fractal dimensions of three types of pore were obtained by linear regression. The results showed that the fractal dimensions of different pore calculated by section linear regression were able to better describe the complex porous structure, where both fractal dimension of mesopore and macropore was more than that of micropore. It indicates that there exists inhomogeneous structure between mesopore and macropore,as well as obvious discreteness of pore distributed in the range from the mesopore to macropore.
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