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

Sheng, Daichao, Pedroso, Dorival M. and Abbo, Andrew J. (2008) Non-convexity and stress-path dependency of unsaturated soil models. Computational Mechanics, 42 5: 685-694. doi:10.1007/s00466-008-0268-0

Author Sheng, Daichao
Pedroso, Dorival M.
Abbo, Andrew J.
Title Non-convexity and stress-path dependency of unsaturated soil models
Journal name Computational Mechanics   Check publisher's open access policy
ISSN 0178-7675
Publication date 2008-10
Sub-type Article (original research)
DOI 10.1007/s00466-008-0268-0
Volume 42
Issue 5
Start page 685
End page 694
Total pages 10
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract 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.
Keyword Unsaturated soils
Path dependent hardening
Non-convex yield surface
Differential algebraic system
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 18 Mar 2011, 16:39:42 EST by Jeannette Watson on behalf of School of Civil Engineering