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通过手标本及电子显微镜对研究区发育的构造煤进行观测,不同类型构造煤在宏观及微观变形特征方面差异性显著。利用分形理论结合压汞实验数据对构造煤孔隙特征进行了研究。研究结果表明:随构造变形程度增强,总孔容、孔隙度整体呈增大趋势,韧性变形阶段尤为显著,而孔隙连通性逐步变差;孔隙特征对构造变形作用的响应程度随孔隙尺度的减小而变弱;基于压汞数据的分形维数仅能有效表征大孔及中孔的孔隙结构特征,分形维数随煤体变形程度的增强而增大,孔隙结构呈现多样化及复杂化;大孔孔容和渗流孔比重与分形维数呈正线性相关,而中孔孔容与分形维数呈正指数相关。
The tectonic coal developed in the study area was observed by hand specimens and electron microscopes. The differences of the macro-and micro-deformation characteristics of different types of tectonic coal were significant. Fractal theory and mercury injection experimental data were used to study the pore structure of coal. The results show that: with the increase of tectonic deformation, the total pore volume and porosity show an overall trend of increasing, ductile deformation stage is particularly significant, while the pore connectivity gradually deteriorates; the response of pore features to tectonic deformation decreases with pore scale Small and weak; the fractal dimension based on mercury intrusion data can only effectively characterize the pore structure of macropores and mesopores, the fractal dimension increases with the degree of deformation of the coal, the pore structure is diversified and complicated; The proportion of macropore pore volume and seepage pore is positively correlated with the fractal dimension, while the pore volume of mesopore is positively correlated with the fractal dimension.