Print Email Facebook Twitter A state-dependent multilaminate constitutive model for anisotropic sands Title A state-dependent multilaminate constitutive model for anisotropic sands Author Bayraktaroglu, H. (TU Delft Geo-engineering) Hicks, M.A. (TU Delft Geo-engineering) Korff, M. (TU Delft Geo-engineering) Galavi, Vahid (DIANA FEA) Date 2023 Abstract Experimental studies show that initial fabric and its evolution under different stress paths highly influence soil behaviour. Even though different sample preparation methods create different inherent anisotropies and cause different material responses, the same initial fabric structure under different stress paths also results in different material behaviours. In this paper, a simple state-dependent, bounding surface-based elastoplastic constitutive model, that can simulate the anisotropic nature of sands including the effect of principal stress rotation, is described. The model is developed based on a semi-micromechanical concept within the multilaminate framework and, to include the inherent anisotropy of sand, a deviatoric fabric tensor describing the initial microstructure is introduced. In addition, a fabric evolution rule compatible with anisotropic critical state theory (ACST) is employed to describe the evolving fabric structure and induced anisotropy towards the critical state (CS). In contrast to the classical strain-driven formulation for fabric evolution, a micro-level evolution rule is proposed. This paper presents concise theoretical aspects of the multilaminate framework and the anisotropic elastoplastic constitutive formulation. The model's capability under drained and undrained monotonic loading conditions at different stress states, relative densities and principal stress orientations is demonstrated by simulating experimental data for Toyoura sand. Subject anisotropyconstitutive relationsfabric/structure of soilsplasticitysands To reference this document use: http://resolver.tudelft.nl/uuid:2c28cc89-d36a-4ec6-bd99-789c6088c8f1 DOI https://doi.org/10.1680/jgeot.22.00165 ISSN 0016-8505 Source Geotechnique: international journal of soil mechanics Part of collection Institutional Repository Document type journal article Rights © 2023 H. Bayraktaroglu, M.A. Hicks, M. Korff, Vahid Galavi Files PDF jgeot.22.00165.pdf 2.78 MB Close viewer /islandora/object/uuid:2c28cc89-d36a-4ec6-bd99-789c6088c8f1/datastream/OBJ/view