Modeling time-dependent behavior of soft sensitive clay

Zhen-Yu Yin, Minna Karstunen, Ching S. Chang, Mirva Koskinen, Matti Lojander

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

The paper focuses on investigating the destructuration process during time-dependent stress-strain evolution. For this purpose, various oedometer tests and triaxial tests on intact and reconstituted samples of soft sensitive Vanttila clay were carried out. Based on experimental observations, a new elastic viscoplastic model, extended from the overstress theory of Perzyna, is developed. The proposed model accounts for inherent and induced anisotropy, interparticle bonds and bond degradation, and viscosity. The determination of model parameters is discussed, demonstrating how all model parameters can be determined in a straightforward way and no additional test is needed for the proposed model compared to the modified Cam clay model. The model is implemented into a finite-element code, which enables coupled consolidation analyses. The model is used to simulate various strain-rate and creep tests under one-dimensional and triaxial conditions on the intact samples of Vanttila clay. The comparisons between experimental results and simulations show that the model has good predictive ability on the time-dependent behavior of a soft sensitive clay.

Original languageEnglish
Pages (from-to)1103-1113
Number of pages11
JournalJournal of geotechnical and geoenvironmental engineering
Volume137
Issue number11
DOIs
Publication statusPublished - Nov 2011

Keywords

  • creep
  • clays
  • time dependant
  • anisotropy
  • viscoplasticity

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