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    Threshold stress and deformation characteristics of clay subgrade for railway tracks

    Access Status
    Fulltext not available
    Authors
    Loh, Richard
    Nikraz, Hamid
    Date
    2011
    Type
    Conference Paper
    
    Metadata
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    Citation
    Loh, Richard B.H. and Nikraz, Hamid R. 2011. Threshold stress and deformation characteristics of clay subgrade for railway tracks, in Chung, C. and Kim, H. and Lee, J. and Jung, Y. and Kim, D. (ed), Deformation characteristics of geomaterials: Proceedings of the Fifth International Symposium on Deformation Characteristics of Geomaterials, (IS-Seoul 2011), Sep 1-3 2011, pp. 620-626. Seoul, Korea: Korean Geotechnical Society.
    Source Title
    Proceedings of the Fifth International Symposium on the Deformation Characteristics of Geo-Materials (IS-Seoul 2011)
    Source Conference
    Fifth International Symposium on the Deformation Characteristics of Geo-Materials (IS-Seoul 2011)
    ISBN
    9781607508212
    9781607508229
    School
    Department of Civil Engineering
    URI
    http://hdl.handle.net/20.500.11937/11552
    Collection
    • Curtin Research Publications
    Abstract

    Clay subgrade beneath railway track experiences stress of cyclic nature that can result in progressive shear failure at a stress level lower than the clay monotonic strength. This paper described the effective stress analysis of threshold stress and the deformation characteristics from a series of cyclic undrained triaxial tests carried out on reconstituted kaolin clay, which simulates the behavior of clay subgrade under cyclic loading conditions due to the loading of passing trains/vehicles. Cyclic loading frequency typical to that experienced by railway track foundations near subgrade surface was employed. In addition, a critical state model is proposed for predicting threshold stress of saturated clay under undrained cyclic compression without resorting to lengthy laboratory testing. Validated by observed tests data, the model provides a lower-bound solution of the threshold stress of clay subgrade for rail tracks, from the measured values of fundamental soil properties, based on consolidation history and current state of stress.

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