构造变形对煤孔隙发育特征影响的研究

摘要

为了研究构造变形作用对煤孔隙发育程度和结构特征的影响,采用压汞法对不同构造变形程度的煤样进行了试验,分析煤的孔容、孔隙度、中值孔径、退汞效率、饱和度中值压力以及孔径分布和孔隙形态特点.通过对不同构造变形程度的煤进行相互对比,以及与原生结构煤对比分析.试验结果表明:随着构造变形程度加深,煤的总孔容、孔隙度、中值孔径逐渐增大,而退汞效率和饱和度中值压力逐渐减小;中孔和大孔增多,而微孔和过渡孔没有明显变化;微孔占比降低,中孔所占比升高,过渡孔和大孔占比变化不明显;开放孔逐渐增多,半封闭孔减少.%In order to study the effect of tectonic deformation for porosity development degree and structure characteristics of coal,mercury injection experiment was carried out on coal samples with different tectonic deformation degree.Total intrusion volume,porosity,median pore diameter,retro-mecurometric efficiency,saturation median pressure,as well as the characteristics of pore size distribution and pore morphology were analyzed.The comparison of coal with different tectonic deformation degree was made,and they were also compared with the primary structure coal.According to the experiment,it can be shown that as tectonic deformation degree deepening,the total intrusion volume,porosity,median pore diameter increase gradually,and retro-mecurometric efficiency and saturation median pressure decreases,mesopore and macropore increases,and the changes of micropore and transition pore are no significant;the proportion of micropore is reduced,mesopore increases,the proportion of transition pore and macropore accounted does not change obviously.quantity of open-type pore increase,and the quantity of semi-closed pore is reduced.