Polar Mohr diagram method and its application in calculating the shear displacements of general shear zones with volume loss——With the Sangshuyuanzi ductile shear zone as an example

作     者：李海 郭召杰 刘瑞洵 刘树文 张志诚 

作者机构：1. Department of Geology Peking University 100871 Beijing China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2000年第43卷第2期

页      面：151-157页

核心收录：

学科分类：0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：国家重大项目(96-915-05-02) the National Natural Science Foundation of China(49202035 ,49572149,49672152) 

主　　题：shear displacement volume change polar Mohr diagram. 

摘      要：The main problem, in determining the shear displacement of a general shear zone with volume change using the available formula, is that it is hard to know the initial angle between the planes (or lines) in the plane of shear. A planar deformation analysis of this kind of ductile shear zone is carried out with the polar Mohr diagram. If the volume change is induced by homogeneous contraction in the Z direction of the shear zone, there are sufficient conditions for constructing a polar Mohr diagram regardless of sequence of the simple shear and volume change. Therefore, the angle between a line and the shear direction before and after the deformation can be measured. Making use of these lines the shear strain and the volume change can be calculated and the shear displacement can be determined.