众所周知,受到构造应力作用的地质体将发生变形。根据力学上的定义,当变形体表面上各点的位移分量与变形体在同方向上的尺寸相比不是小很多的情形时,称之为大变形或有限变形,相对应的应变通常与1相比不是小很多,则称为有限应变,目前地学中所泛指的有限应变是指在渐进变形过程中若干增量应变的总和或是总应变大于1％—3％。在研究和分析地质构造变形的 It is well known that geologic bodies subject to tectonic stress will deform. According to the mechanical definition, when the displacement of each point on the surface of the deformed body is not much smaller than that of the deformed body in the same direction, it is called large deformation or limited deformation. The corresponding strain is usually the same as that of 1 phase The finite strain, which is generally referred to in geosciences, refers to the sum of several incremental strains or the total strain greater than 1% -3% during progressive deformation. In studying and analyzing the deformation of geological formations