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Interpretation of creep of soils by rate process theory / J. Feda in Géotechnique, Vol. 39 N°4 (Decembre 1989) 

Public ISBD [article]  in Géotechnique > Vol. 39 N°4 (Decembre 1989) . - pp. 667 –677 Titre : Interpretation of creep of soils by rate process theory Type de document : texte imprimé Auteurs : J. Feda, Auteur Année de publication : 2007 Article en page(s) : pp. 667 –677 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Constitutive  relations  Clays  Shear  tests  Time  dependence  Sands  Fabric/structure  of  soils Résumé : The Author uses experimental data from four types of soils to analyse, in terms of effective stresses, distortional and volumetric creep on the basis of rate process theory. Both types of creep are governed by the same creep laws. In the course of creep, either time- (and strain) dependent structural hardening or softening occur, the first one being typical for volumetric creep, the second one for distortional creep. Some deviations are to be expected with anisotropic soil structure (for example, with presheared samples). Rate process theory, intended for the description of secondary creep rate, may be generalized by taking into account the structural changes of soils (hardening and softening of structure, as characterized by the increase or decrease of the number of structural bonds). In such a case, secondary creep results from the balance of strain-hardening and strain-softening (the first one typical for primary creep, the second one for tertiary creep), which is delicate enough for secondary creep to extend through more than a small time interval. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.4.667 [article] Interpretation of creep of soils by rate process theory [texte imprimé] / J. Feda, Auteur . - 2007 . - pp. 667 –677. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°4 (Decembre 1989) . - pp. 667 –677 Mots-clés : Constitutive  relations  Clays  Shear  tests  Time  dependence  Sands  Fabric/structure  of  soils Résumé : The Author uses experimental data from four types of soils to analyse, in terms of effective stresses, distortional and volumetric creep on the basis of rate process theory. Both types of creep are governed by the same creep laws. In the course of creep, either time- (and strain) dependent structural hardening or softening occur, the first one being typical for volumetric creep, the second one for distortional creep. Some deviations are to be expected with anisotropic soil structure (for example, with presheared samples). Rate process theory, intended for the description of secondary creep rate, may be generalized by taking into account the structural changes of soils (hardening and softening of structure, as characterized by the increase or decrease of the number of structural bonds). In such a case, secondary creep results from the balance of strain-hardening and strain-softening (the first one typical for primary creep, the second one for tertiary creep), which is delicate enough for secondary creep to extend through more than a small time interval. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.4.667