Tay creep: a multi-mechanism model for rate-dependent deformation of soils

Zhenhao Shi (Lead / Corresponding author), David Muir Wood, Maosong Huang, James P. Hambleton

Research output: Contribution to journalArticlepeer-review

Abstract

Constitutive models constructed within the combined framework of kinematic hardening and bounding surface plasticity have proved to be successful in describing the rate-independent deformation of soils under non-monotonic histories of stress or strain. Most soils show some rate-dependence of their deformation characteristics, and it is important for the constitutive models to be able to reproduce rate-or time-dependent patterns of response. This paper explores a constitutive modelling approach that combines multiple viscoplastic mechanisms contributing to the overall rate-sensitive deformation of a soil. A simple viscoplastic extension of an inviscid kinematic hardening model incorporates two viscoplastic mechanisms applying an overstress formulation toa 'consolidation surface' and a 'recent stress history surface'. Depending on the current stress state and the relative 'strength' of the two mechanisms, the viscoplastic mechanisms may collaborate or compete with each other. This modelling approach is shown to be able to reproduce many observed patterns of rate-dependent response of soils.

Original languageEnglish
Number of pages13
JournalGeotechnique
Early online date15 Dec 2021
DOIs
Publication statusE-pub ahead of print - 15 Dec 2021

Keywords

  • constitutive model
  • elasto-viscoplasticity
  • kinematic hardening
  • rate dependence
  • soils

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