Structure initiale et propriétés de liquéfaction statique d'un sableInitial structure and static liquefaction properties of sand. |
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Authors: | Nadia Benahmed Jean Canou Jean-Claude Dupla |
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Institution: | 1. Department of Civil Engineering, University of Bristol, Queen''s Building, Bristol BS8 1TR, UK;2. Centre d''enseignement et de recherche en mécanique des sols (CERMES), commun à l''École nationale des ponts et chaussées (ENPC) et au Laboratoire central des ponts et chaussées (LCPC), 6 et 8, avenue Blaise Pascal, cité Descartes/Champs-sur-Marne, 77455 Marne-la-Vallée cedex 2, France |
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Abstract: | 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). To cite this article: N. Benahmed et al., C. R. Mecanique 332 (2004). |
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Keywords: | Milieux granulaires Liquéfaction Sable Essai triaxial Pluviation Damage Instabilité Structure Dilatance Contractance Granular media Liquefaction Sand Triaxial test Pluviation Tamping Instability Structure Dilatancy Contractancy |
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