Modeling anisotropic, debonding and viscous behaviors of natural soft clays

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


A new viscoplastic model is developed extended from overstress theory of Perzyna. A scaling function based on the experimental results of constant strain-rate oedometer tests is adopted, which allows viscoplastic strain-rate occurring wherever the stress state is inside or outside of the reference surface. The inherent and induced anisotropy is incorporated using the formulations of yield surface and its rotation of S-CLAY1. The bonds are progressively destroyed by plastic straining by incorporating the concept of an intrinsic yield surface. No additional test is needed for determining all model parameters compared to the Modified Cam Clay model, and the parameters determination is straightforward. The experimental verification is carried out with reference to the constant strain-rate and creep tests on two natural clays.

Original languageEnglish
Title of host publicationSoil Behavior and Geo-Micromechanics - Proceedings of the 2010 GeoShanghai International Conference
Number of pages6
Edition200 GSP
Publication statusPublished - 6 Sep 2010
Externally publishedYes
Event2010 GeoShanghai International Conference - Soil Behavior and Geo-Micromechanics - Shanghai, China
Duration: 3 Jun 20105 Jun 2010

Publication series

NameGeotechnical Special Publication
Number200 GSP
ISSN (Print)0895-0563


Conference2010 GeoShanghai International Conference - Soil Behavior and Geo-Micromechanics


  • Anisotropy
  • Bonding
  • Clays

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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