淮北矿区许疃矿构造煤类型及其孔隙特征研究

Study on Types of Tectonic Coal from Xutuan Coal Mine in Huaibei Coalfield and Its Pore Characteristics

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。

Tectonic coal in the study area was observed by hand specimen and electron microscope, and the differences were significant between different types of tectonic coal in macroscopic and microscopic deformation characteristics. The fractal theory is used to study the pore characteristics of tectonic coal based on the experimental data of mercury intrusion. The results show that the total pore volume and porosity increase with the increase of deformation degree, especially in the ductile deformation stage, but the pore connectivity is gradually getting worse. The response of pore characteristics to the deformation of the tectonic becomes weaker with the decrease of pore size. Fractal dimension based on pressure mercury data can only represent the characteristics of the pore structure of the macropore and mesopore effectively. The fraetal dimension increases with the increase of the deformation degree of coal, and the pore structure becomes more diversified and complicated, macropore volume or the proportion of seepage holes shows positive linear correlation with fraeta] dimension, but mesopore volume shows positive exponential correlation with fraetal dimension.