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conference paper

Advanced hydro-mechanical coupling for unified constitutive modelling of unsaturated soils

Nuth, Mathieu  
•
Laloui, Lyesse  
Toll, David G.
•
Augarde, Charles E.
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2008
Unsaturated Soils: Advances in Geo-Engineering
1st European Conference on Unsaturated Soils, E-Unsat

A new unified constitutive hydro-mechanical model named ACMEG-s is formulated to improve modelling of unsaturated soils in free or constrained conditions. Indeed, due to particular mechanical and hydraulic boundary conditions, some natural and engineered fine grained soils are highly constrained. When submitted to in-situ wetting-drying cycles, such soils are prone either to collapsing or to generating swelling pressures. The proposed unified framework provides a direct explanation for complex confined behaviour of unsaturated soils. A sophisticated saturated model based on two coupled plastic mechanisms has been extended to deal with partially saturated states. The adopted stress framework includes a Bishop-type effective stress for the mechanical part and the matric suction for the hydraulic part. Some simplifications brought by the socalled generalised effective stress representation versus conventional net stress and suction representation are overviewed and related to the definition of the ‘Loading Collapse’ yield curve. Other implications of the unique mechanical stress associated with suction couplings are shown to be essential in prediction. The most pioneering results from the model validation by integration via a custom numerical tool are exposed. The combination of the advanced yet simple stress framework and the adapted yield locus is used for the prediction of oedometric and constant volume tests, leading to a straightforward interpretation of swelling pressure tests.

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Type
conference paper
DOI
10.1201/9780203884430.fmatt
Web of Science ID

WOS:000268178300075

Author(s)
Nuth, Mathieu  
Laloui, Lyesse  
Editors
Toll, David G.
•
Augarde, Charles E.
•
Wheeler, Simon J.
Date Issued

2008

Publisher

Taylor & Francis

Publisher place

London

Published in
Unsaturated Soils: Advances in Geo-Engineering
Start page

559

End page

565

Subjects

partial saturation

•

constitutive modelling

•

effective stress

URL

URL

http://www.e-unsat.dur.ac.uk/
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMS  
Event nameEvent placeEvent date
1st European Conference on Unsaturated Soils, E-Unsat

Durham

July 2-4, 2008

Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/26918
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