Predicting the onset of static liquefaction of loose sand with fines / Rahman Md. Mizanur in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 8 (Août 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 1037–1041 Titre : Predicting the onset of static liquefaction of loose sand with fines Type de document : texte imprimé Auteurs : Rahman Md. Mizanur, Auteur ; S. R. Lo, Auteur Année de publication : 2012 Article en page(s) : pp. 1037–1041 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Sands Fines Instability Strain softening Equivalent state Résumé : Loose sandy soil subject to undrained shearing manifests deviatoric strain softening, and such a behavior has been referred to as collapse, static liquefaction, or instability. This paper uses the term instability and characterizes its triggering by the corresponding effective stress ratio, referred to as the instability ratio, ηIS. To capture the influence of fines on ηIS, the state parameter, ψ, as originally proposed by Been and Jefferies, was generalized to an equivalent granular state parameter, ψ∗. This is achieved simply by replacing the void ratio, e, with the equivalent granular void ratio, e∗. The conversion from e to e∗ was achieved by a predictive approach, and backanalysis is not required. It was hypothesized that, provided the fines content is less than the threshold value, ηIS and ψ∗, at the start of undrained shearing, can be described by a single relationship irrespective of the fines content. Two published databases and a series of undrained triaxial tests results are used to evaluate this hypothesis. The importance of this relationship is significant, because it can be used to predict ηIS for sand with different fines content. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000661 [article] Predicting the onset of static liquefaction of loose sand with fines [texte imprimé] / Rahman Md. Mizanur, Auteur ; S. R. Lo, Auteur . - 2012 . - pp. 1037–1041. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 1037–1041 Mots-clés : Sands Fines Instability Strain softening Equivalent state Résumé : Loose sandy soil subject to undrained shearing manifests deviatoric strain softening, and such a behavior has been referred to as collapse, static liquefaction, or instability. This paper uses the term instability and characterizes its triggering by the corresponding effective stress ratio, referred to as the instability ratio, ηIS. To capture the influence of fines on ηIS, the state parameter, ψ, as originally proposed by Been and Jefferies, was generalized to an equivalent granular state parameter, ψ∗. This is achieved simply by replacing the void ratio, e, with the equivalent granular void ratio, e∗. The conversion from e to e∗ was achieved by a predictive approach, and backanalysis is not required. It was hypothesized that, provided the fines content is less than the threshold value, ηIS and ψ∗, at the start of undrained shearing, can be described by a single relationship irrespective of the fines content. Two published databases and a series of undrained triaxial tests results are used to evaluate this hypothesis. The importance of this relationship is significant, because it can be used to predict ηIS for sand with different fines content. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000661

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