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http://dx.doi.org/10.7843/kgs.2020.36.4.5

Revision of Modified Cam Clay Failure Surface Based on the Critical State Theory  

Woo, Sang Inn (Dept. of Civil and Environmental Engrg., Hannam Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.36, no.4, 2020 , pp. 5-15 More about this Journal
Abstract
This paper proposes a revised Modified Cam Clay type failure surface based on the critical state theory. In the plane of the mean effective and von Mises stresses, the original Modified Cam Clay model has an elliptic failure surface which leads the critical-state mean effective stress to be always half of the pre-consolidation mean effective stress without hardening and evolution rules. This feature does not agree with the real mechanical response of clay. In this study, the preconsolidation mean effective stress only reflects the consolidation history of the clay whereas the critical state mean effective stress only relies on the currenct void ratio of clay. Therefore, the proposed failure surface has a distorted elliptic shape without any fixed ratio between the preconsolidation and critical state mean effective stresses. Numerical simulations for various clays using failure surfaces as yield surface provide mechanical responses similar to the experimental data.
Keywords
Clay; Constitutive model; Critical state; Modified cam clay; Triaxial conditions;
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