Modelling the cyclic ratcheting of sands through memory-enhanced bounding surface plasticity

H Liu, J A Abell, Andrea Diambra, F Pisano

Research output: Contribution to journalArticle (Academic Journal)peer-review

13 Citations (Scopus)
51 Downloads (Pure)

Abstract

The modelling and simulation of cyclic sand ratcheting is tackled by means of a plasticity model formulated within the well-known critical state, bounding surface SANISAND framework. For this purpose, a third locus - termed the 'memory surface' - is cast into the constitutive formulation, so as to phenomenologically capture micro-mechanical, fabric-related processes directly relevant to the cyclic response. The predictive capability of the model under numerous loading cycles ('high-cyclic' loading) is explored with focus on drained loading conditions, and validated against experimental test results from the literature - including triaxial, simple shear and cyclic loading by oedometer test. The model proves capable of reproducing the transition from ratcheting to shakedown response, in combination with a single set of soil parameters for different initial, boundary and loading conditions. This work contributes to the analysis of soil-structure interaction under high-cyclic loading events, such as those induced by environmental and/or traffic loads.

Original languageEnglish
Pages (from-to)783-800
Number of pages18
JournalGéotechnique
Volume69
Issue number9
Early online date13 Aug 2019
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • constitutive relations
  • numerical modelling
  • offshore engineering
  • plasticity
  • sands
  • stiffness

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