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Micromechanical Origin of Static and Dynamic Liquefaction in Granular Soils
Liquefaction instabilities have been studied extensively for the last five decades. Since then, a number of models to predict the onset and the evolution of liquefaction have been proposed. Also, recently, some theoretical criteria have been proposed and used to predict the onset of static and dynamic liquefaction, based on plasticity theory and the concept of diffuse instabilities. However useful these criteria might be, they only predict liquefaction as a macroscopic phenomenon and cannot explain why it happens from micromechanical processes. The objective of this work is to take a first step into opening the hood behind the macroscopic process of liquefaction instability, by looking at the corresponding underlying micromechanical processes. In this way, we will unravel the micromechanical origin of liquefaction. To do this, we use continuum elastoplasticity at the macro scale and discrete element methods at the granular scale to simulate particle mechanics under undrained conditions. We hope this work will shed further insight into the origin of instabilities in general and would result in more predictive physics-based models in the near future.
Micromechanical Origin of Static and Dynamic Liquefaction in Granular Soils
Liquefaction instabilities have been studied extensively for the last five decades. Since then, a number of models to predict the onset and the evolution of liquefaction have been proposed. Also, recently, some theoretical criteria have been proposed and used to predict the onset of static and dynamic liquefaction, based on plasticity theory and the concept of diffuse instabilities. However useful these criteria might be, they only predict liquefaction as a macroscopic phenomenon and cannot explain why it happens from micromechanical processes. The objective of this work is to take a first step into opening the hood behind the macroscopic process of liquefaction instability, by looking at the corresponding underlying micromechanical processes. In this way, we will unravel the micromechanical origin of liquefaction. To do this, we use continuum elastoplasticity at the macro scale and discrete element methods at the granular scale to simulate particle mechanics under undrained conditions. We hope this work will shed further insight into the origin of instabilities in general and would result in more predictive physics-based models in the near future.
Micromechanical Origin of Static and Dynamic Liquefaction in Granular Soils
Andrade, J. E. (Autor:in) / Mital, U. (Autor:in) / Mohammadnejad, T. (Autor:in)
Fifth Biot Conference on Poromechanics ; 2013 ; Vienna, Austria
Poromechanics V ; 527-532
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
| British Library Online Contents | 2014
Static Liquefaction of Granular Soils: The Role of Grain Shape and Size
| Springer Verlag | 2014