淮南煤田深部煤的孔隙特征及其意义

从压汞试验入手,对淮南煤田煤的孔隙结构随埋藏深度的变化进行分析,根据大量实验数据得到以下认识:随采样深度的增大,煤中总比孔容积呈减小趋势,其中大孔的比孔容积在总比孔容积中所占比率逐渐减小,微孔的比孔容积在总比孔容积中所占比率显示增大趋势;随埋藏深度增加,煤的孔隙率有减小迹象,煤的真密度和视密度呈线性增加。煤内微孔的增多使煤吸附瓦斯的容量相对增多。深部煤与其顶板和底板岩石的力学性质的差异减小,使深部煤层厚度的稳定性增加。

Pore Characteristics of Deep Part Coal and Significance in Huainan Coalfield

To start with mercury porosimetry, analyzed coal pore structural changing along with buried depth variation in the Huainan coalfield. Summarized a mass of tested data and found that along with sampling depth increasing, a decreasing trend of total specific pore volume presented, in which, specific pore volume proportion of macropore decreasing and mieropore increasing. Again, along with depth increasing, coal porosity factor is decreasing, while true density and apparent density increasing linearly. The mieropore increasing makes coal gas absorption volume increasing relatively. The narrowing of mechanical property differences between coal and its roof/floor rocks makes deep part coal seam thickness stability improved.