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Titre :
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The bearing capacity of footings on granular soils. I, Numerical analysis (2011)
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Auteurs :
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C. K. Lau, Auteur ;
M. D. Bolton, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Géotechnique (Vol. 61 N° 8, Août 2011)
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Article en page(s) :
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pp. 627–638
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Note générale :
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Génie Civil
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Langues :
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Anglais
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Index. décimale :
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624 (Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes)
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Tags :
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Stress analysis Bearing capacity Shear strength Footings/foundations Plasticity Numerical modelling
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Résumé :
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The method of characteristics has been used to determine the bearing capacity of shallow foundations, in either plane-strain or axisymmetric condition. Most previous solutions for granular soils were based either on a straight (c, φ ) envelope or simply on a constant angle of shearing, φ . For granular soils, sec φ usually varies linearly with the logarithm of mean effective stress. A new method of calculation permits φ to vary throughout the stress field as an arbitrary (or empirical) function of stress. This method is verified for both plane-strain and axisymmetric conditions by forcing a variation in sec φ equivalent to generating a constant-cohesion envelope, for which solutions already exist. The variable- φ analysis is used to demonstrate the highly significant effect of stress variation around and beneath a footing. Finally, it is shown that an equivalent constant value φ m can be derived empirically, using the new solutions to identify an equivalent mean effective stress p m. However, only the variable- φ solution can simultaneously capture the bearing capacity and the geometry of the bearing mechanism.
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DEWEY :
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624.15
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ISSN :
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0016-8505
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En ligne :
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http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00206
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