突出区煤的孔隙结构特征研究

Study on Porous Structure Characteristics of Colal in Outburst Zone

用压汞法和ＣＯ２吸附法对突出区煤的孔隙结构特征进行了研究。结果表明，突出区煤的孔隙率、孔容、比表面积等均随其碳原子摩尔分数Ｘｃ的增大而增大，且上述参数均与煤样点的位置有关；研究了煤样存在两个分形维数Ｄ２和Ｄ３，Ｄ２随Ｘｃ和孔隙率的增大而增大，而Ｄ３和ΔＤ却正好相反。由煤样的采点位置和开采中的实际情况可认为：煤的孔隙率、压汞曲线滞后程度、中孔孔容和分维数Ｄ２及ＣＯ２比表面积越大，分形维数Ｄ３和ΔＤ越小，煤的突出危险性越大。

Abstract Porous structure characteristics of coal in outburst zone was studied by pressurized mercury method and CO2 absorption method. It was shown by the results that porosity, pore volume, specific surface area of coal in outburst zone increased with the increase of its carbon atom mole fraction, and the above mentioned parameters were related to the position of coal sampled. Through research it was known that there are two fractal dimensions, D2 and D3 existing in coal samples, D2 increases with the increase of Xc and porosity, the condition of D3 and D is contrary to the former. It can be considered from the coal sampling location and the practical condition in mining that the larger the coal porosity, delay degree of pressurized mercury curve, volume of medium pores, fractal dimensions D2, absorbed volume of CO2, and specific area of pores, the smaller of D3 and D, the greater the outburst risk of coal.