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Abstract
The paper deals with the anisotropic extension of an inherently isotropic hypoplastic constitutive model. Inherent transverse isotropy is incorporated into the model with the help of an operator of anisotropy which is determined by the orientation of the bedding plane and three constitutive parameters. The approach is rather general and is not connected with any specific type of constitutive model. In the present study, two possible extensions of the hypoplastic equation are considered: the application of the anisotropy operator to the nonlinear part of the equation and to the whole equation. The two modifications are exemplified by numerical calculations of simple shear.