Elastoplastic Model for the Long-Term Behavior Modeling of Unbound Granular Materials in Flexible Pavements
Publication: International Journal of Geomechanics
Volume 6, Issue 4
Abstract
The constitutive modeling of cyclic plasticity of soils has made great progress, especially in the area of sands liquefaction modeling. Nowadays, the problem of rutting of flexible pavements linked to permanent deformations occurring in the unbound layers is taken into account only by empirical formulas. This paper presents an elastoplastic model with both isotropic and kinematic hardening. The yield surface, plastic potential, and isotropic hardening are based on a model for sands, which takes into account the influence of the initial void ratio and of the mean stress on the mechanical behavior. A kinematic hardening has been added in order to take into account the mechanical behavior of the material for large cycle numbers. A complete model is then developed, simulations are presented, and comparisons with repeated load triaxial tests carried out on a subgrade soil (clayey sand), have been made. These comparisons underline the capabilities of the model to take into account the monotonic, cyclic, and ratchetting behavior of unbound materials for roads.
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Information
Published In
International Journal of Geomechanics
Volume 6 • Issue 4 • July 2006
Pages: 279 - 289
Copyright
© 2006 ASCE.
History
Received: Aug 2, 2004
Accepted: Sep 29, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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