本文运用连续介质力学中的“主轴”理论,对地质体非均匀有限应变场的研究提出一个近似计算方法。这一方法是以野外变形标志物的实际应变测量或岩石晶体组构研究所提供的某些信息和数据为基础,得出有限点的主应交方位,然后进行数学处理,得到两组光滑的正交主方位线,这两组正交曲线网格反映了岩石的变形特征,并满足应变的协调条件。 In this paper, the theory of “principal axis” in continuum mechanics is used to propose an approximate calculation method for the study of inhomogeneous finite strain field of geologic bodies. Based on some of the information and data provided by the actual strain measurements of the deformation markers in the field or the study of the crystal structure of the rock, this method derives the main due positions of finite points and then performs mathematical processing to obtain two sets of smooth Orthogonal principal azimuth line, these two sets of orthogonal curvilinear grids reflect the deformation characteristics of rocks and meet the coordination of strain.