Criterion for flow liquefaction instability

José E. Andrade, Alfonso M. Ramos, Arcesio Lizcano

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

This paper describes a general liquefaction flow instability criterion for elastoplastic soils based on the concept of loss of uniqueness. We apply the criterion to the general case of axisymmetric loading and invoke the concepts of effective stresses and loss of controllability to arrive at a general criterion for the onset of liquefaction flow. The criterion is used in conjunction with an elastoplastic model for sands to generate numerical simulations. The numerical results are compared with experimental evidence to give the following insights into predicting liquefaction. 1) The criterion proposed clearly and naturally differentiates between liquefaction flow (instability) and cyclic mobility. 2) Flow liquefaction not only depends on the potential of the material to generate positive excess pore pressures, but more importantly, it also depends on the current state of the material, which is rarely predicted by phenomenology.

Original languageEnglish
Title of host publicationConstitutive Modeling of Geomaterials
Subtitle of host publicationAdvances and New Applications
PublisherSpringer Verlag
Pages167-172
Number of pages6
ISBN (Print)9783642328138
DOIs
StatePublished - 2013

Publication series

NameSpringer Series in Geomechanics and Geoengineering
ISSN (Print)1866-8755
ISSN (Electronic)1866-8763

Keywords

  • Elastoplasticity
  • Flow liquefaction
  • Sands
  • Undrained instabilities

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