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Influence of non/low-plastic fines and associated aging effects on liquefaction resistance / Takaji Kokusho in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 6 (Juin 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 747–756 Titre : Influence of non/low-plastic fines and associated aging effects on liquefaction resistance Type de document : texte imprimé Auteurs : Takaji Kokusho, Auteur ; Fumiki Ito, Auteur ; Yohta Nagao, Auteur Année de publication : 2012 Article en page(s) : pp. 747–756 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Liquefaction  resistance  Cone  resistance  Fines  content  Aging  effect  Triaxial  test  Cementation  Cement  content Résumé : The objective of the study presented herein is the development of an understanding of the influence of non/low-plastic fines and associated aging effects on the penetration resistance (qt) and liquefaction resistance (RL) of sandy soils. Towards this end, the authors performed a series of cyclic triaxial tests on samples having varying relative densities (Dr) and fines contents (Fc), wherein a miniature cone was incorporated into the triaxial apparatus. This allowed the penetration resistance and the liquefaction resistance to be determined directly for the samples. To simulate geologic aging effects, a small amount of cement was mixed in with the soil during sample preparation. From “unaged samples” without cement, it was found that although both RL and qt decrease as Fc increases, a unique relationship exists between RL and qt that is independent of Fc. However, from samples having the same Cc/Fc (i.e., simulating the same geologic age), it was found that RL increases as Fc increases for the same qt. This trend is consistent with field-based RL-qt correlations for natural soil deposits to which aging effects are intrinsic. Thus, it has been clarified that it is not the Fc-value by itself but rather the cementation effect associated with higher Fc that results in a higher liquefaction resistance for a given qt. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000632 [article] Influence of non/low-plastic fines and associated aging effects on liquefaction resistance [texte imprimé] / Takaji Kokusho, Auteur ; Fumiki Ito, Auteur ; Yohta Nagao, Auteur . - 2012 . - pp. 747–756. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 747–756 Mots-clés : Liquefaction  resistance  Cone  resistance  Fines  content  Aging  effect  Triaxial  test  Cementation  Cement  content Résumé : The objective of the study presented herein is the development of an understanding of the influence of non/low-plastic fines and associated aging effects on the penetration resistance (qt) and liquefaction resistance (RL) of sandy soils. Towards this end, the authors performed a series of cyclic triaxial tests on samples having varying relative densities (Dr) and fines contents (Fc), wherein a miniature cone was incorporated into the triaxial apparatus. This allowed the penetration resistance and the liquefaction resistance to be determined directly for the samples. To simulate geologic aging effects, a small amount of cement was mixed in with the soil during sample preparation. From “unaged samples” without cement, it was found that although both RL and qt decrease as Fc increases, a unique relationship exists between RL and qt that is independent of Fc. However, from samples having the same Cc/Fc (i.e., simulating the same geologic age), it was found that RL increases as Fc increases for the same qt. This trend is consistent with field-based RL-qt correlations for natural soil deposits to which aging effects are intrinsic. Thus, it has been clarified that it is not the Fc-value by itself but rather the cementation effect associated with higher Fc that results in a higher liquefaction resistance for a given qt. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000632