Identifying parameters controlling soil delayed behaviour from laboratory and in situ pressuremeter testing

Zhenyu Yin, P.-Y. Hicher

Research output: Journal article publicationJournal articleAcademic researchpeer-review

82 Citations (Scopus)

Abstract

The aim of this paper is to present a methodology for identifying the soil parameters controlling the delayed behaviour from laboratory and in situ pressuremeter tests by using an elasto-viscoplastic model (EVP-MCC) based on Perzyna's overstress theory and on the elasto-plastic Modified Cam Clay model. The influence of both the model parameters and the soil permeability was studied under the loading condition of pressuremeter tests by coupling the proposed model equations with Biot's consolidation theory. On the basis of the parametric study, a methodology for identifying model parameters and soil permeability by inverse analysis from three levels of constant strain rate pressuremeter tests was then proposed and applied on tests performed on natural Saint-Herblain clay. The methodology was validated by comparing the optimized values of soil parameters and the values of the same parameters obtained from laboratory test results, and also by using the identified parameters to simulate other tests on the same samples. The analysis of the drainage condition and the strain rate effect during a pressuremeter test demonstrated the coupled influence of consolidation and viscous effects on the test results. The numerical results also showed that the inverse analysis procedure could successfully determine the parameters controlling the time-dependent soil behaviour. Copyright © 2008 John Wiley & Sons, Ltd.
Original languageEnglish
Pages (from-to)1515-1535
Number of pages21
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume32
Issue number12
DOIs
Publication statusPublished - 25 Aug 2008
Externally publishedYes

Keywords

  • Consolidation
  • Modified Cam Clay
  • Parameter identification
  • Pressuremeter test
  • Soft clay
  • Viscoplasticity

ASJC Scopus subject areas

  • Computational Mechanics
  • Materials Science(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials

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