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为探索孔隙压力对煤岩渗透特性的影响和瓦斯运移规律,以贵州六盘水矿区的煤样为研究对象,利用自带能量扩散X射线(EDX)扫描电镜(SEM)、比表面微孔分析仪,分析煤岩的孔隙特征,同时利用自主加工的三轴渗流装置,进行不同压差下孔隙压力变化的渗流试验研究。结果表明,煤岩孔隙特征、氮气吸附量与孔裂隙发育程度成正相关关系,且与孔径的孔连通率有关。压差一定时,随着孔隙压力增加,煤岩渗透率下降,呈指数函数规律;压差小时,煤岩渗透率的减小率随孔隙压力的增大而减小。煤岩渗透率随试件两端压差的增大呈指数函数减小。
In order to explore the influence of pore pressure on the permeability of coal and the law of gas migration, the coal samples from Liupanshui Mining Area in Guizhou Province were used as research objects. The energy dispersive X-ray diffraction (EDX) scanning electron microscopy (SEM) , The pore characteristics of coal and rock are analyzed. At the same time, the self-processing three-axis seepage device is used to study the seepage test of pore pressure under different pressure differences. The results show that the pore characteristics of coal and rock, and the amount of nitrogen adsorption are positively correlated with the development of pore fissures, and are related to the pore connectivity rate. With a certain pressure difference, with the increase of pore pressure, the permeability of coal and rock decreases exponentially. When the pressure difference is small, the decrease of permeability of coal and rock decreases with the increase of pore pressure. The permeability of coal rock decreases exponentially with the increase of pressure drop across the specimen.