Comptes Rendus
Unexpected collapses during isotropic consolidation of model granular materials
Comptes Rendus. Mécanique, Volume 344 (2016) no. 2, pp. 69-77.

This paper reports the unexpected instantaneous instabilities of idealized granular materials under simple isotropic drained compression. Specimens of monosized glass beads submitted to isotropic compression exhibit a series of local collapses under undetermined external stress with partial liquefaction, experience sudden volumetric compaction and axial contraction of various amplitude. Short-lived excess pore water pressure vibrates like an oscillating underdamped system in the first dynamic transient phase and rapidly disperses in the subsequent longer dissipation phase. However, very dense samples maintain a collapse-free behaviour below a threshold void ratio e30col at 30 kPa of stress. The potential mechanisms that could explain these spontaneous collapses are discussed.

Cet article concerne les instabilités instantanées et inattendues des milieux granulaires modèles en simple consolidation isotrope. Les échantillons de billes de verre monodisperses soumis à une compression isotrope montrent une série d'effondrements locaux à des contraintes externes indéterminées, avec une liquéfaction partielle, une compaction volumétrique et une contraction axiale d'amplitude variable. Les très courts excès de pression interstitielle vibrent comme un système oscillant sous-amorti pendant une première phase dynamique transitoire, puis rapidement se dispersent pendant une phase de dissipation plus longue. Néanmoins, les échantillons très denses en dessous d'un seuil d'indice des vides e30col à 30 kPa de contrainte sont exempts d'instabilités. Les mécanismes potentiels pouvant expliquer ces effondrements spontanés sont discutés.

Received:
Accepted:
Published online:
DOI: 10.1016/j.crme.2015.11.001
Keywords: Consolidation, Instability, Partial liquefaction, Pore pressure, Granular media
Mot clés : Consolidation, Instabilité, Liquéfaction partielle, Pression interstitielle, Milieux granulaires

Thiep Doanh 1; Alain Le Bot 2; Nouha Abdelmoula 1; Lassad Gribaa 1; Stéphane Hans 1; Claude Boutin 1

1 École nationale des travaux publics de l'État, LGCB, LTDS (UMR 5513), Vaulx-en-Velin, France
2 École centrale de Lyon, LTDS (UMR 5513), Écully cedex, France
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Thiep Doanh; Alain Le Bot; Nouha Abdelmoula; Lassad Gribaa; Stéphane Hans; Claude Boutin. Unexpected collapses during isotropic consolidation of model granular materials. Comptes Rendus. Mécanique, Volume 344 (2016) no. 2, pp. 69-77. doi : 10.1016/j.crme.2015.11.001. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2015.11.001/

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