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自变形岩石的有限应变分析用于构造地质学研究以来,如何表示有限应变是构造地质工作者一直在讨论研究的问题之一。国外已经研究出了一整套表示方法。在国内这项研究工作还刚刚开始,部分构造地质工作者对于有限应变分析和图解的表示方法还不十分熟悉。为了使大家对有限应变图解表示法有一个较清楚的了解,本人谈一谈我们学习和研究过程中的点滴体会,以希起抛砖引玉之用。由于我们水平有限,文中难免有错误,乞望读者指正。归纳起来,有限应变的表示法有两类:一类是数字表示法,一类是图解表示法。如一个单位立方体受均匀有限变形后成为一个长柱体,其有限应变为: 三个主应变为ex,er和ez(ex≥er≥ez),用自然(或对数)应变表示则为:
Since finite strain analysis of self-deformed rocks was used to construct geology studies, how to express finite strain is one of the issues that structural geologists have been discussing. A set of representation methods has been researched abroad. In China, this research work has just begun. Some structural geologists are not very familiar with finite strain analysis and graphical representation. In order to make everyone have a clearer understanding of the graphical representation of limited-strain, I talk about our experience in the process of learning and research and use it as a reference. Due to our limited level, the text will inevitably have errors, hope readers correct me. To sum up, there are two types of finite strain representations: one is a digital representation, and the other is a graphical representation. If a unit cube is subjected to uniform finite deformation and becomes a long cylinder, its finite strain is: The three principal strains are ex, er, and ez (ex≥er≥ez), and the natural (or logarithmic) strain is: