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dc.contributor.authorLoh, Richard
dc.contributor.authorNikraz, Hamid
dc.identifier.citationLoh, 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.

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.

dc.publisherKasetsart University, Thailand
dc.subjectcyclic loading
dc.subjectconstitutive modeling
dc.subjectthreshold stress
dc.titleCritical state modeling of lower-bound threshold stress for clay subgrade
dc.typeConference Paper
dcterms.source.titleProceedings of the 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011)
dcterms.source.seriesProceedings of the 5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011)
dcterms.source.conference5th Asia-Pacific Conference on Unsaturated Soils (AP-UNSAT 2011)
dcterms.source.conference-start-dateFeb 29 2012
dcterms.source.conferencelocationPattaya, Thailand
curtin.departmentDepartment of Civil Engineering
curtin.accessStatusOpen access

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