关键词: 剪切破裂带, 尾端张、压性区, 有限元模拟, 应力集中

Abstract: En echelon shear rupture zone is of a common type of ruptures in the crust. Several models which contain one,two and three fanlts arranged in en echelon arrays are calculated by twe-dimensional finite element method. The result indicates that a shear rupture zone acts just as a single shear fault in kinematics. There exist tensile and compressive areas at both ends of a shear rupture zone. They are the products of the relative movement of two blocks along the shear rupture zone. The structure of rock bridge (pullapart basin or push-upward) and the meterial mechanical coefficient are two main factors affecting the concentration of the tensile and compressive stresses at the ends of a shear rupture zone. Moreover,the structural features and faulting types in tensile and compressible areas are discussed in the paper.

Key words: Shear rupture zone, Tensile or compressive area, Finite element simulation, Stress concentration