摘要
通过扫描电镜与X射线衍射仪对不含蒙脱石的华北中生代煤系地层泥岩的微观结构与物质组成进行分析,研究了该泥岩遇水软化过程中微观结构随时间变化的动态特征.研究表明:泥岩中的矿物颗粒在水的作用下,颗粒间的连结将逐渐破坏,使水分进入层状颗粒之间,从而在岩石内部产生不均匀内应力以及大量的微孔隙.这些微孔隙的出现及其吸附效应的影响,进一步破坏了岩石的内部结构体系,使泥岩在宏观上产生软化崩解的现象.可见,泥岩内部结构体系的特点是其软化崩解的真正原因,而是否含有蒙脱石并非泥岩软化崩解的决定性因素.
A series of tests on the interaction between mudstone and water were conducted to research features of mudstone without montmorillonite from the Mesozoic coal-bearing strata of North China. The microstructure characteristics of mudstone in saturated state at different time were studied by means of scanning electron microscopy and X-ray diffraction analysis. The study shows that water will gradually undermine the cohesiveness between the mineral particles of mudstone in saturated state and enter the pores between the chip-shaped particles. Subsequently, it will result in uneven inner-stress and a lot of micropores in mudstone and induce softening and degradation. Results show that the decisive factor of mudstone softening and degradation in water is not the montmorillonite in the mudstone but the feature of mudstone microstructure.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第7期866-870,共5页
Journal of Tongji University:Natural Science
关键词
泥岩
软化
泥化
微观机理
mudstone
softening
argillitization
micromechanism
