Taehoon Koh
International Journal of Railway, vol. 3, no. 4, pp.117-122, 2010

Abstract : In transportation geotechnical engineering, stress-strain behavior of earth structures has been analyzed by numerical sim¬ulations with the implemented plasticity constitutive model. It is a fact that many advanced plasticity constitutive mod¬els on predicting the mechanical behavior of soils have been developed as well as experimental research works for geotechnical applications in the past decades. In this study, recently developed, a unified constitutive model for both clay and sand, which is referred to as CASM (clay and sand model), was compared with a classical constitutive model, Cam-Clay model. Moreover, integration methods of stress-strain rate equations using CASM were presented for simulation of undrained and drained triaxial compression tests. As a conclusion, it was observed that semi-implicit integration method has more improved accuracy of capturing strain rate response to applied stress than explicit integration by the multiple correction and iteration.

Keyword : CASM (clay and sand model), Cam-Clay model, Semi-implicit integration, Explicit integration, Stress-strain rate equation