A partir de deux modes de reconstitution bien différenciés d'éprouvettes triaxiales de sable, le damage humide et la pluviation à sec, on met en évidence, sur un sable de référence, des différences de comportement mécanique associées significatives vis-à-vis du phénomène de liquéfaction « statique ». Le damage humide favorise l'initiation de l'instabilité de liquéfaction alors que la pluviation favorise un comportement plus stable, moins liquéfiable. L'observation microscopique des matériaux sableux correspondants permet de mettre en évidence deux structures bien différenciées, à savoir, pour le damage humide, une structure irrégulière dans laquelle prédominent des agrégats (grains agrégés) et des macropores, très contractante et instable et, pour la pluviation, une structure plus régulière, sans macropores, plus dilatante et plus stable. Ces observations montrent l'importance qu'il y aurait à caractériser, à l'aide de paramètres appropriés, la structure initiale des matériaux sableux, directement liée à leur mode de formation (naturel ou artificiel).
Based on the use of two different preparation procedures for reconstituting triaxial samples of sand, i.e. wet tamping and dry pluviation, significant differences in associated mechanical behaviour are observed on a reference sand with respect to the phenomenon of ‘static’ liquefaction. Wet tamping favours the initiation of liquefaction instability, whereas dry pluviation favours a more stable behaviour, less susceptible to liquefaction. Microscopic observation of corresponding sand specimens allows us to identify two well differentiated structures, i.e., for wet tamping, an irregular structure with predominance of aggregates (aggregated grains) and macropores, very contractant and unstable and, for dry pluviation, a more regular structure, without macropores, more dilatant and more stable. These observations show the importance of further characterization, based on the introduction of appropriate parameters, of the initial structure of sandy materials, strongly dependant upon their mode of formation (natural or artificial).
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Keywords: Granular media, Liquefaction, Sand, Triaxial test, Pluviation, Tamping, Instability, Structure, Dilatancy, Contractancy
Nadia Benahmed 1 ; Jean Canou 2 ; Jean-Claude Dupla 2
@article{CRMECA_2004__332_11_887_0,
author = {Nadia Benahmed and Jean Canou and Jean-Claude Dupla},
title = {Structure initiale et propri\'et\'es de liqu\'efaction statique d'un sable},
journal = {Comptes Rendus. M\'ecanique},
pages = {887--894},
publisher = {Elsevier},
volume = {332},
number = {11},
year = {2004},
doi = {10.1016/j.crme.2004.07.009},
language = {fr},
}
TY - JOUR AU - Nadia Benahmed AU - Jean Canou AU - Jean-Claude Dupla TI - Structure initiale et propriétés de liquéfaction statique d'un sable JO - Comptes Rendus. Mécanique PY - 2004 SP - 887 EP - 894 VL - 332 IS - 11 PB - Elsevier DO - 10.1016/j.crme.2004.07.009 LA - fr ID - CRMECA_2004__332_11_887_0 ER -
Nadia Benahmed; Jean Canou; Jean-Claude Dupla. Structure initiale et propriétés de liquéfaction statique d'un sable. Comptes Rendus. Mécanique, Volume 332 (2004) no. 11, pp. 887-894. doi : 10.1016/j.crme.2004.07.009. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.07.009/
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