A rational approach to railway track foundation design with clay subgrade
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In planning the railway line, crossing low-lying area of high plasticity clay formation soil for straight line alignment may become necessary either for cost efficiency or shorter travelling time. This paper describes the new approach, which served to rationalize and reformulate the current state of design and management process of rail track substructure involved clay subgrade. It puts forward the concept of “Managing current lower-bound threshold stress” for clay subgrade on the premise that lower-bound threshold stress which represents subgrade capacity of the most vulnerable state, is not necessarily a constant material parameter and can potentially increase two folds which should be taken into consideration for economical design. The readily use of proposed theoretical model and design charts for predicting and re-assessing threshold stress offers a key advantage for the new approach over current practices.
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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)The aligning of railroad crossing lowland of high plasticity clay formation soil may at times become necessary despite it being technically undesirable. This has called for better understanding and extra engineering ...
Loh, Richard; Nikraz, Hamid (2011)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 ...