In the stiff overconsolidated soil deposits anisotropy influences small and intermediate strain stiffness and hence it has important impact on the results of discplacement preditcions in soil-structure modelling. The authors developed a cross-anisotropic soil model which combines both stress dependent and micro-structural anisotropy. The model is based on the anisotropic hyperelastic kernel for small strain stiffness. Reference shear modulus is subjected to the stiffness degradation function of strain controlled by the Brick-type procedure. It allows to model stiffness degradation and its regaining after loading reversals in the intermediate strain range. The shear strength is controlled, however, by the conventional isotropic criterion. The main components of the model are presented with some element simulations. Finally the model is used in two example FE-analyses of tunnelling and excavation boundary value problems. Results with different degrees of microstructural cross-anisotropy and stress induced anisotropy are compared and discussed.
Autorzy
Informacje dodatkowe
- Kategoria
- Aktywność konferencyjna
- Typ
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Język
- angielski
- Rok wydania
- 2017
