电镜图像在黄土结构性研究中应用的几个问题

Several Problems on Application of SEM Image in the Structure Properties Study of Loess

摘要:

镜结构性图像是认识黄土结构特征,分析黄土土力学特性的重要方法.本文对不同研究目的情况下如何利用黄土电镜微结构图像的问题进行了探讨,并指出随着观察放大倍数的不同,黄土的结构性图像显示出明显的尺度效应.定义了黄土结构性的分类以避免因笼统使用"微结构"这一词所带来的指代不准确性.根据土力学研究的需要对黄土孔隙划分标准提出了新的认识,建立一套新的分类标准以便利于研究运用.最后综述了在研究中选用黄土电镜结构性图像的原则.

Abstract:

SEM microstructure images of loess, used properly, can be important means for the explanation of soil mechanics properties of loess. In this paper, the proper selection to SEM microstructure images under different studing purpose is discussed. It is also believed that the fabric of loess has a ＂scale effect＂, which makes the fabrics revealed with different magnification times for image and so does their physical substantiality. The authors define the classification of loess fabric to avoid the uncertainty in description the nature of the fabrics at different scale due to the using of the generalized term ＂microstructure＂. For the convenience of soil mechanics study, the authors also propose a new classification of pores to reflect the reality of pores, to reflect nature of their formation mechanism and their relationship with the classification of grains. Finally, some general ideas on selection of SEM images in study are summarized.