Critical states and soil modelling

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    Critical states play a central role in many constitutive models. Traditionally critical states have been defined as asymptotic states in which shearing continues without further change in stresses or density. However, such asymptotic states may not be easily observed in practice and devices in which part or all oldie sample can be sheared to large deformations are required. Laboratory tests combined with discrete element modelling show the effects of journeys towards the critical state and show that a steady mobilised strength is reached at a modest shear strain whereas other parameters, such as grading and density are still changing slowly at very large strains. A grading state index is defined and introduced into a constitutive model to demonstrate how changing grading can affect the response of geotechnical systems.

    Original languageEnglish
    Title of host publicationDeformational characteristics of geomaterials, Vols 1 and 2
    EditorsSusan E. Burns, Paul W. Mayne, J. Carlos Santamarina
    Place of PublicationAmsterdam
    PublisherI O S PRESS
    Number of pages22
    ISBN (Print)9781586039080
    Publication statusPublished - 2008
    Event4th International Symposium on Deformation Characteristics of Geomaterials - Atlanta, United States
    Duration: 21 Sept 200824 Sept 2008


    Conference4th International Symposium on Deformation Characteristics of Geomaterials
    Country/TerritoryUnited States
    Internet address


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