Non-convexity and stress-path dependency of unsaturated soil models

Title: Non-convexity and stress-path dependency of unsaturated soil models
Creator: Sheng, Daichao; Pedroso, Dorival M.; Abbo, Andrew J.
Relation: Computational Mechanics Vol. 42, Issue 5, p. 685-694
Publisher Link: http://dx.doi.org/10.1007/s00466-008-0268-0
Publisher: Springer
Resource Type: journal article
Date: 2008
Description: Yield surfaces for unsaturated soils are usually non-convex if the size of the yield surface has to increase with increasing suction. An expanding yield surface with increasing suction is crucial for modelling the volume collapse due to wetting. The non-convexity always exists at the transition between saturated and unsaturated states, irrespective of the stress variables used in the model. Some recent models for unsaturated soils also possess a stress path dependent hardening law. The non-convexity and stress-path dependency of the constitutive model make the implementation into finite element codes very challenging. This paper discusses aspects of stress integration schemes for non-convex and stress-path dependent models for unsaturated soils.
Subject: unsaturated soils; path dependent hardening; non-convex yield surface; differential algebraic system; Runge–Kutta method; numerical integration; stress update
Identifier: http://hdl.handle.net/1959.13/41335
Identifier: uon:4732
Identifier: ISSN:0178-7675
Language: eng
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