Numerical simulation of the quicksand phenomenon by a 3D coupled Discrete Element ‐ Lattice Boltzmann hydromechanical model

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  • Mouloud Mansouri
    Département de Génie Civil Université Ferhat Abbas Setif 1 Setif 19000 Algeria
  • Moulay Said El Youssoufi
    LMGC ‐ UMR 5508 Université de Montpellier ‐ CC048 163 rue Auguste Broussonnet Montpellier 34090 France
  • François Nicot
    Université Grenoble‐Alpes, IRSTEA Unité de Recherche ETNA, Domaine Universitaire BP 76, F38402 ‐ Saint Martin d'Hères France

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<jats:title>Summary</jats:title><jats:p>This paper deals with the numerical simulation of the quicksand phenomenon using a coupled Discrete Elements – Lattice Boltzmann hydromechanical model. After the presentation of the developed numerical model, simulations of ascending fluid flow through granular deposits are performed. The simulations show that the quicksand actually triggers for a hydraulic gradient very close to the critical hydraulic gradient calculated from the global analysis of classical soil mechanics, that is, when the resultant of the applied external pressure balances submerged weight of the deposit. Moreover, they point out that the quicksand phenomenon does not occur only for hydraulic gradients above the critical hydraulic gradient, but also in some cases with slightly lower gradients. In such cases, a more permeable zone is first gradually built at the bottom of the deposit through a grain rearrangement, which increases the hydraulic gradient in the upper zones and triggers the phenomenon. Copyright © 2016 John Wiley & Sons, Ltd.</jats:p>

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