Anisotropic creep model for soft soils

Martino Leoni, Minna Karstunen, Pieter Vermeer, University of Stuttgart, University of Strathclyde, EC MRTN-CT-2004–512120 (Funder), Academy of Finland Grant 210744 (Funder)

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In this paper a new anisotropic model for time-dependent behaviour of soft soils is presented. The formulation is based on a previously developed isotropic creep model, assuming rotated Modified Cam Clay ellipses as contours of volumetric creep strain rates. A rotational hardening law is adopted to account for changes in anisotropy due to viscous strains. Although this will introduce some new soil parameters, they do not need calibration as they can be expressed as functions of basic soil parameters through simple analytical expressions. To start with, the one-dimensional response of the model is discussed, making it possible to explore how the model is capable of capturing key features of viscous soft soil behaviour. Subsequently, the three-dimensional generalisation of the model is presented, followed by comparison with experimental data, showing good agreement in both triaxial undrained compression and extension. In the authors' opinion, the simple formulation of the model makes it attractive for use in engineering practice.
Original languageEnglish
Pages (from-to)215-226
Number of pages12
Issue number3
Publication statusPublished - 1 Apr 2008


  • sedimentary rocks
  • clastic rocks
  • soils
  • compressibility
  • extension
  • compression
  • calibration
  • strain
  • anisotropy
  • strain rates
  • clay
  • soft soils
  • models
  • creep

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