Research Article
Apr 1979
Viscoplasticity of Normally Consolidated Clays
Authors: Atilla M. Ansal, AM.ASCE, Raymond J. Krizek, M.ASCE, and Zdeněk P. Bažant, M.ASCEAuthor Affiliations
Publication: Journal of the Geotechnical Engineering Division
Volume 105, Issue 4
Abstract
A constitutive law is developed to model the behavior of normally consolidated isotropic cohesive soils under multidimensional stress or strain paths. This law represents the endochronic form of viscoplasticity and involves a number of material variables that are defined in terms of semi-empirical expressions and model: (1)Strain softening and hardening; (2)densification and dilatancy; (3)frictional aspects; and (4)strain rate dependence of the response. Furthermore, by considering saturated soils as two-phase media, the model accounts for the development of pore pressures due to the volumetric strain in the solid skeleton. Data reported in the literature are used to demonstrate the applicability of the approach, and approximate correlations between material parameters are established to predict the stress-strain-pore response of normally consolidated clays.
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Published In
Journal of the Geotechnical Engineering Division
Volume 105 • Issue 4 • April 1979
Pages: 519 - 537
Copyright
© 1979 American Society of Civil Engineers.
History
Published in print: Apr 1979
Published online: Feb 11, 2021
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Atilla M. Ansal, AM.ASCE
Asst. Prof. of Geotechnical Engrg.; Macka Civ. Engrg. School, Istanbul Technical Univ., Istanbul, Turkey; formerly, Post-doctoral Research Fellow, Dept. of Civ. Engrg., Northwestern Univ., Evanston, Ill
Raymond J. Krizek, M.ASCE
Prof. of Civ. Engrg.; Northwestern Univ., Evanston, Ill
Zdeněk P. Bažant, M.ASCE
Prof. of Civ. Engrg.; Northwestern Univ., Evanston, Ill
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