American Society of Civil Engineers


An Elasto-Viscoplastic Model for Soft Clay


by Z. Y. Yin, (Institut de Recherche en Génie Civil et Mécanique, GeM UMR CNRS 6183, Ecole Centrale de Nantes, BP 92101, 44321 Nantes Cédex 3, France E-mail: : zhenyu.yin@ec-nantes.fr and Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China), P. Y. Hicher, (Institut de Recherche en Génie Civil et Mécanique, GeM UMR CNRS 6183, Ecole Centrale de Nantes, BP 92101, 44321 Nantes Cédex 3, France), Y. Riou, (Institut de Recherche en Génie Civil et Mécanique, GeM UMR CNRS 6183, Ecole Centrale de Nantes, BP 92101, 44321 Nantes Cédex 3, France), and H. W. Huang, (Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China E-mail: huanghw@mail.tongji.edu.cn)
Section: Constitutive Modeling and Numerical Methods, pp. 312-219, (doi:  http://dx.doi.org/10.1061/40862(194)42)

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Document type: Conference Proceeding Paper
Part of: Soil and Rock Behavior and Modeling
Abstract: The purpose of this paper is to present the development of an elasto-viscoplastic model for normally consolidated clay. A three dimensional constitutive equation was derived based on the framework of Perzyna’s overstress theory and Modified Cam-Clay model. It was implemented in a finite element program, and applied to analyze time-dependent behavior of soft clay. The influence of two viscous parameters, which can be determined by undrained triaxial compression tests, was studied. The proposed model was verified using observed laboratory responses of several natural clays. The results showed that the model can satisfactorily describe the stress-strain-rate behavior such as strain rate effect, creep and stress relaxation.


ASCE Subject Headings:
Soft soils
Clays
Viscoplasticity
Elastoplasticity
Time dependence
Finite element method