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Influence of anisotropic stiffness in numerical analyses of tunneling and excavation problems in stiff soils
Abstract
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.
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Details
- Category:
- Conference activity
- Type:
- publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
- Title of issue:
- Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul 2017, vol. 2 strony 719 - 722
- Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Cudny M., Partyka E.: Influence of anisotropic stiffness in numerical analyses of tunneling and excavation problems in stiff soils// Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul 2017, vol. 2/ ed. Woojin Lee, Jong-Sub Lee, Hyun-Ki Kim, Dong-Soo Kim Seoul: , 2017, s.719-722
- Verified by:
- Gdańsk University of Technology
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