A Constitutive Model for Soft Clays
Vasantha Wijeyakulasuriya
In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical ConferenceSession: Soil Mechanics
ABSTRACT: For deformation analyses in soft clays involving nearly monotonic loading paths, the Cambridge critical state constitutive models (CCM) have been particularly successful. These isotropic volumetric work hardening models (original Cam clay (OCC) and the modified Cam clay (MCC)) which are based on associative plasticity, invoke different empirical plastic work equations to define the shape of the respective yield curves. These models depend only on three material constants M, and . The predictive capability of these models for strain prediction varies along anisotropic compression paths and drained paths. This paper reports a model applicable for monotonic loading paths based on the simulation of an incremental stress path as being made up of an incremental undrained path and an incremental anisotropic compression path, using the same three material constants as the CCM. The shear behaviour of soft Bangkok clay is well documented in the literature. The proposed model was applied on a previously published drained stress path. Improved predictions compared to CCM were observed for the investigated test results for soft Bangkok clay.
RÉSUMÉ: Pour les analyses de déformation dans les argiles molles impliquant les courbes de chargement presque monotones, les modèles des états critiques ont été particulièrement réussies. Ces modèles développés au Cambridge sur écrouissage volumétrique isotrope (la Cam-Clay originale et la Cam Clay modifié) qui sont basés sur la plasticité associative invoquent équations empiriques différentes de travail de base dans la zone plastique pour définir la forme de la courbe des taux respectifs. La présente sur la simulation d'une courbe de contrainte incrémental comme étant composé d'une courbe non drainée incrémentale et une courbe de compression anisotrope incrémentale à l'aide des trois mêmes constantes matérielles comme les modèles de Cam-littérature et les valeurs des constantes matérielles sont bien établies. La modèle proposée améliorée la capacité prédictive par rapport aux modèles de Cam-Clay a été observée pour les résultats expérimentales déjà publiés pour
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Vasantha Wijeyakulasuriya (2014) A Constitutive Model for Soft Clays in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.
@article{GeoRegina14Paper237,
author = Vasantha Wijeyakulasuriya,
title = A Constitutive Model for Soft Clays ,
year = 2014
}
title = A Constitutive Model for Soft Clays ,
year = 2014
}