Anisotropic model of sedimentary rocks

An anisotropic model of sedimentary rocks is presented. The inherent anisotropy of this kind of material is described with an anisotropy parameter. A microstructure tensor and loading orientation are incorporated in the distribution functions of anisotropy parameter and uniaxial compressive strength. A complete plasticity model describing the deformation process in anisotropic sedimentary rocks is given. Several triaxial tests are simulated with the anisotropic model. The results show that the inherent anisotropy in sedimentary rocks can be efficiently described with the model.