Microstructural modeling of rate-dependent behavior of soft soil

Z. Y. Yin, C. S. Chang, P. Y. Hicher, M. Karstunen

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

3 Citations (Scopus)

Abstract

The aim of this paper is to model the rate-dependent behavior of soft soil by means of a microstructural approach. A new microstructural elasto-viscoplastic model was developed, based on the granular mechanics approach and the overstress theory of Perzyna. The deformation of a representative volume of the material is generated by mobilizing particle contacts. Thus, the stress-strain relationship can be derived as an average of the mobilization on these local contact planes. The local behavior is assumed to follow a Hertz-Mindlin's elastic law, a Mohr-Coulomb yield criterion for shear sliding and a cone-shaped yield function for normal compression. Only a few triaxial tests, with a stage of isotropic consolidation followed with an undrained shearing up to failure at critical state, are required to calibrate the model parameters. Undrained triaxial tests on Lower Cromer Till are simulated by the proposed model. An investigation also considers the rate-dependent behavior. All test simulations, compared to experimental results, demonstrate the ability of the proposed model to reproduce accurately the rate-dependent behavior of soft soil.

Original languageEnglish
Title of host publication12th International Conference on Computer Methods and Advances in Geomechanics 2008
Pages862-868
Number of pages7
Publication statusPublished - 1 Dec 2008
Externally publishedYes
Event12th International Conference on Computer Methods and Advances in Geomechanics 2008 - Goa, India
Duration: 1 Oct 20086 Oct 2008

Publication series

Name12th International Conference on Computer Methods and Advances in Geomechanics 2008
Volume2

Conference

Conference12th International Conference on Computer Methods and Advances in Geomechanics 2008
CountryIndia
CityGoa
Period1/10/086/10/08

Keywords

  • Elasto-viscoplasticity
  • Microstructure
  • Rate-dependency
  • Soft clay

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Applied Mathematics

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