Threshold stress and deformation characteristics of clay subgrade for railway tracks
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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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Loh, Beng Heng (2011)The railway track foundation of fine-grained soil subgrade, under repeated loading of cyclic nature, can gradually build up excess pore pressure and result in progressive shear failure at a stress level much lower than ...
Loh, Richard; Nikraz, Hamid (2012)This paper discussed the undrained triaxial testing of soft clay which may be encountered as subgrade soil in the alignment of railway track or road pavement. Several series of both static and cyclic undrained triaxial ...
Loh, R.; Nikraz, Hamid (2012)This paper discussed the undrained triaxial testing of soft clay which may be encountered as subgrade soil in the alignment of railway track or road pavement. Several series of both static and cyclic undrained triaxial ...