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On the Numerical Implementation of a Multi-Mechanism Cyclic Plasticity Model Associated to a Dilation Second Gradient Model Aiming Strain Localization Mitigation

  • A. FoucaultEmail author
  • F. Voldoire
  • A. Modaressi
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG, volume 11)

Abstract

This paper deals with numerical simulations of granular soils, idealized by a cyclic multi-mechanism anisotropic non-associated plasticity constitutive model (Aubry et al. 1982; Hujeux 1985) coupled to a dilation second gradient model (Fernandes et al. 2008), under a finite elements method framework. This constitutive model is integrated through an implicit scheme into the Finite Element software Code_Aster(Foucault 2009). The use of this constitutive model, in case of strain localization, exhibits mesh sensitivity as for any strain-softening model. First we verify the ability of the dilation second gradient model to (1) circumvent the problem of mesh sensitivity with this model and to (2) describe the post-peak behaviour of the studied loading process. We studied a biaxial laboratory test, on Hostun sand, under drained conditions and monotonic loading. Second we develop a methodology to determine the values of the second gradient parameter – i.e. characteristic length – for different sets of soil model parameters. We have adapted a 1-D theoretical approach proposed by Chambon et al. (2001), applied to our constitutive model, whose comparison with our numerical results provides a characteristic length. To check the ability of the dilation second gradient model to ensure objective results with this soil constitutive model, we performed an extensive validation on a bearing capacity case with excavation.

Keywords

Soil cyclic behavior model Multi-mechanism plasticity Softening Strain localization Second gradient dilation model 

References

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Laboratoire MSSMatCNRS UMR 8579, École Centrale ParisChâtenay-MalabryFrance
  2. 2.Laboratoire LaMSIDUMR EDF/CNRS 2832ClamartFrance
  3. 3.Département Analyses Mécanique et AcoustiqueEDF Recherche et DéveloppementClamartFrance

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