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Published October 2013 | public
Journal Article

Criterion for flow liquefaction instability


This study 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 onset of liquefaction flow is a state of instability occurring under both monotonic and cyclic tests, and coincides with loss of controllability. (2) The criterion proposed herein clearly and naturally differentiates between liquefaction flow (instability) and cyclic mobility. (3) 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.

Additional Information

© 2013 Springer-Verlag Berlin Heidelberg. Received: 7 September 2012; Accepted: 18 February 2013; Published online: 12 March 2013. AMR acknowledges the financial support given to this work by Pontificia Universidad Javeriana by grant number 004705 'Numerical and experimental research of diffuse instability in granular matter.' Support for JEA's work was partially provided by NSF grant number CMMI-1060087. This support is gratefully acknowledged. The authors thank Ivan Vlahinic and Utkarsh Mital from Caltech for proofreading this manuscript.

Additional details

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