Formulation and implementation of a practical multi-surface soil plasticity model

This paper presents a new constitutive model for clay, for undrained monotonic and cyclic loading, that has been developed specifically for geotechnical design applications. The model employs a parallel Iwan approach, consisting of multiple elastic-perfectly-plastic micro models. Degradation of stif...

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Bibliographic Details
Published in:Computers and geotechnics 2020-01, Vol.117, p.103092, Article 103092
Main Authors: Whyte, S.A., Burd, H.J., Martin, C.M., Rattley, M.J.
Format: Article
Language:English
Subjects:
Calibration
Clay
Constitutive model
Constitutive models
Cyclic loading
Cyclic loads
Empirical analysis
Finite element method
Lateral loads
Mathematical models
Monopile
Offshore
Offshore foundation
Parallel Iwan model
Plasticity
Soil
Soil surfaces
Stiffness
Undrained clay
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Summary:This paper presents a new constitutive model for clay, for undrained monotonic and cyclic loading, that has been developed specifically for geotechnical design applications. The model employs a parallel Iwan approach, consisting of multiple elastic-perfectly-plastic micro models. Degradation of stiffness and strength during cyclic loading is incorporated using an empirical cyclic overlay method. The theoretical framework and calibration processes for the model are presented. An implementation of the model in a commercial finite element program is then described; this implementation is demonstrated via 3D finite element analyses of example offshore monopile foundations subjected to monotonic and cyclic lateral loading.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2019.05.007