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Titre du document / Document title

CASM : A unified state parameter model for clay and sand

Auteur(s) / Author(s)

YU H. S. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Civil Engineering and Surveying, The University of Newcastle, N.S.W. 2308, AUSTRALIE

Résumé / Abstract

The purpose of this paper is to present a simple, unified critical state constitutive model for both clay and sand. The model, called CASM (Clay And Sand Model), is formulated in terms of the state parameter that is defined as the vertical distance between current state (v, p') and the critical state line in v-ln p' space. The paper first shows that the standard Cam-clay models (i.e. the original and modified Cam-clay models) can be reformulated in terms of the state parameter. Although the standard Cam-clay models prove to be successful in modelling normally consolidated clays, it is well known that they cannot predict many important features of the behavior of sands and overconsolidated clays. By adopting a general stress ratio-state parameter relation to describe the state boundary surface of soils, it is shown that a simple, unified constitutive model (CASM) can be developed for both clay and sand. It is also demonstrated that the standard Cam-clay yield surfaces can be either recovered or approximated as special cases of the yield locus assumed in CASM. The main feature of the proposed model is that a single set of yield and plastic potential functions has been used to model the behaviour of clay and sand under both drained and undrained loading conditions. In addition, it is shown that the behaviour of overconsolidated clays can also be satisfactorily modelled. Simplicity is a major advantage of the present state parameter model, as only two new material constants need to be introduced when compared with the standard Cam-clay models.

Revue / Journal Title

International journal for numerical and analytical methods in geomechanics    ISSN  0363-9061   CODEN IJNGDZ 

Source / Source

1998, vol. 22, no8, pp. 621-653 (68 ref.)

Langue / Language

Anglais

Editeur / Publisher

Wiley, Chichester, ROYAUME-UNI  (1977) (Revue)

Mots-clés anglais / English Keywords

Overconsolidated soil

;

Clay

;

Sand

;

Numerical simulation

;

State estimation

;

Stress analysis

;

Plasticity

;

Critical state

;

Parametric method

;

Preconsolidation

;

Pressure distribution

;

Dilatancy

;

Triaxial test

;

Forecast model

;

Constitutive equation

;

Mots-clés français / French Keywords

Sol surconsolidé

;

Argile

;

Sable

;

Simulation numérique

;

Estimation état

;

Analyse contrainte

;

Plasticité

;

Etat critique

;

Méthode paramétrique

;

Préconsolidation

;

Distribution pression

;

Dilatance

;

Essai triaxial

;

Modèle prévision

;

Equation constitutive

;

Mots-clés espagnols / Spanish Keywords

Suelo sobreconsolidado

;

Arcilla

;

Arena

;

Simulación numérica

;

Estimación estado

;

Análisis tensión

;

Plasticidad

;

Estado crítico

;

Método paramétrico

;

Preconsolidación

;

Distribución presión

;

Dilatancia

;

Ensayo triaxial

;

Modelo previsión

;

Ecuación constitutiva

;

Localisation / Location

INIST-CNRS, Cote INIST : 17699, 35400007276513.0020

Nº notice refdoc (ud4) : 2334588



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