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    Critical state modeling of lower-bound threshold stress for clay subgrade

    183383_183383.pdf (252.4Kb)
    Access Status
    Open access
    Authors
    Loh, Richard
    Nikraz, Hamid
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Loh, R.H. and Nikraz, H.R. 2012. Critical state modeling of lower-bound threshold stress for clay subgrade, in Jotisankasa, A. Sawangsuriya, A. Soralump S. and Mairaing W. (ed), Proceedings of the 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011), Feb 29-Mar 2 2012, pp. 301-306. Pattaya, Thailand: Kasetsart University.
    Source Title
    Proceedings of the 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011)
    Source Conference
    5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011)
    ISBN
    9786167522777
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/3311
    Collection
    • Curtin Research Publications
    Abstract

    Railway track foundation with fine-grained subgrade, under loading of cyclic nature, can build up excess pore pressure and results in progressive shear failure at a stress level less than its static undrained strength. It is widely accepted a threshold stress level exists, where loading above such level causes large deformation; otherwise stability of vertical track profile will be assured. This paper described the theoretical model that predicts the threshold stress of clay soil. The threshold stress so determined represents the lower-bound solution for bearing strength capacity of clay subgrade which normally exists in an unsaturated state. Developed from the “original Cam-clay” model and validated by series of undrained cyclic triaxial test data on reconstituted kaolin clay, the proposed theoretical model enables the prediction of threshold stress to be made from the fundamental properties of the soil, based on current state of stress and stress history of the sub-grade soil. The model reserved its ability to further expand into predicting the threshold stress of soil in its un-saturated state.

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