A Semi-micromechanical Framework for Anisotropic Sands
Bayraktaroglu, H. (TU Delft Geo-engineering)
Hicks, M.A. (TU Delft Geo-engineering)
Korff, M. (TU Delft Geo-engineering)
Barla, Marco (editor)
Insana, Alessandra (editor)
Di Donna, Alice (editor)
Sterpi, Donatella (editor)
In this paper, a state-dependent semi-micromechanical framework for anisotropic sands is proposed. A simple constitutive model based on critical state theory and bounding surface (BS) plasticity is used to describe idealized micro-level soil behaviour, and a slip theory based multilaminate framework employed to create a link between the micro and macro level responses of soil. A contact normal based second order fabric tensor is used to create a mathematical description of the anisotropic nature of sand. The proposed constitutive framework can reproduce various soil responses, stemming from both the inherent anisotropy which highly depends on the sample preparation method and induced anisotropy resulting from the applied stress path. This paper presents concise theoretical aspects of the multilaminate framework and the anisotropic elastoplastic constitutive formulation. Finally, the model's performance in predicting sand response is demonstrated under drained and undrained conditions at different stress states, relative densities and loading conditions by simulating Karlsruhe sand, and is examined through a comparison with two other sophisticated constitutive models for sand, namely the Dafalias and Manzari (2004) version of Sanisand and hypoplasticity with intergranular strain.
To reference this document use:
Challenges and Innovations in Geomechanics: Proceedings of the 16th International Conference of IACMAG, 3
6th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2022, 2022-08-30 → 2022-09-02, Turin, Italy
Lecture Notes in Civil Engineering, 2366-2557, 288 LNCE
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
© 2023 H. Bayraktaroglu, M.A. Hicks, M. Korff