Influencia de la orientación de la anisotropía en el desarrollo de shear bands: estudio experimental

Abstract

Shear bands are geologic structures widely used as kinematic indicators. Despite the large amount of studies about these structures, their mechanical development is not yet well known. This work presents an experimental study of shear band localization and evolution under coaxial deformation. Particular attention is given to the influence of the obliquity of anisotropy planes on the orientation of shear bands. During deformation, two conjugate sets of shear bands develop symmetrically for models with layers parallel to the extension axis, while for oblique orientations one set dominates. Anisotropy planes have a strong influence on the local stress field around conjugate fracture systems, which deviates from the applied boundary conditions