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Soil Mechanics: Modelling liquefaction of soils in FEM using elementary constitutive models

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awa5114

Structural
Feb 1, 2016
135
NL
I am a researcher working on modelling soil liquefaction due to induced seismic excitation. The FEM code I am using is Plaxis2D.

Plaxis2D can model the onset of liquefaction using advanced constitutive models such as UBC-SAND. I am however interested in doing this for more basic material models, specifically Linear Elastic and Mohr Coulomb. Of course, neither of these models can simulate post liquefaction behavior as the soil becomes a fluid. I am interested to find out if they can model the onset of liquefaction.

In addition to this I would like to figure out how to detect this onset. Research has shown to me that liquefaction due to cyclic loading, or "cyclic mobility" occurs when there is a buildup of pore water pressure over time from this cyclic loading. After a while the buildup may overcome the effective stress (since total stress = effective stress + pore pressure) and the model will perhaps fail to converge as this will effectively be the liquefaction point.

Does anyone know what I'm talking about? Is it possible to model liquefaction onset using Mohr Coulomb or Linear Elastic constitutive models?
 
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