构造煤孔隙结构特征研究——以阳泉矿区二矿15煤为例

Pore Structure Characteristics of Tectonic Coal—Taking 15 Coal of the Second Mine in Yangquan Mining Area as an Example

本文以阳泉矿区二矿15煤层为研究对象,通过压汞、液氮和二氧化碳吸附实验,探讨阳泉矿区二矿主采煤层15煤层构造煤不同孔径阶段(大孔、介孔、微孔)孔隙结构特征。结果表明:阳泉矿区15煤原生结构煤和构造煤的压汞曲线主要为平行型和双S型;构造煤(尤其是强变形的碎粒煤)的孔体积和比表面积显著高于原生结构煤;随着煤体变形强度的增加,大孔各阶段孔体积都有增加趋势,优势孔径呈现出逐渐减小的趋势,孔隙吼道发育增多,退汞效率下降,介孔结构孔径趋于连续和均匀分布,而构造变形对于煤的微孔结构影响甚微。

This paper takes the 15 coal seam of Yangquan Mine No.2 as the research object, and explores the pore structure characteristics of tectonic coal in different pore size stages (macroporous, mesoporous, and microporous) in the 15 coal seam of the main coal seam of Yangquan Mine No.2 by means of pressure mercury, liquid nitrogen, and carbon dioxide adsorption experiments. The results indicate that the pressure mercury curves of primary structural coal and structural coal in Yangquan Mine Area 15 are predominantly of a parallel type and a double S type. Furthermore, the pore volume and surface area of structural coal, particularly crushed coal that has undergone significant deformation, are significantly greater than that of primary structural coal. As the deformation strength of the coal increases, it can be observed that the pore volume of macropores in each stage tends to increase, while the dominant pore diameter is now decreasing. The pore roar development increases, and the mercury retreating efficiency decreases. The pore diameter of mesopore structure tends to be continuous and uniform. The pore size is observed to be continuous and uniformly distributed, and the tectonic deformation is found to have a minimal effect on the microporous structure of coal.