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Correcting liquefaction resistance of unsaturated soil using wave velocity / Akhter M. Hossain in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 277-287 Titre : Correcting liquefaction resistance of unsaturated soil using wave velocity Type de document : texte imprimé Auteurs : Akhter M. Hossain, Auteur ; Ronald D. Andrus, Auteur ; William M. CampIII, Auteur Année de publication : 2013 Article en page(s) : pp. 277-287 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : compression;  wave  velocity;  soil  liquefaction;  penetration  tests;  shear  waves;  unsaturated  soils Résumé : Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity (VP) and shear wave velocity (VS) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on VP exhibit less scatter than the test data based on the ratio VP/VS. For this reason, the VP-based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average VP is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with VP<1,200 m/s in the critical layers are corrected and plotted on penetration- and VS-based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000770 [article] Correcting liquefaction resistance of unsaturated soil using wave velocity [texte imprimé] / Akhter M. Hossain, Auteur ; Ronald D. Andrus, Auteur ; William M. CampIII, Auteur . - 2013 . - pp. 277-287. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 277-287 Mots-clés : compression;  wave  velocity;  soil  liquefaction;  penetration  tests;  shear  waves;  unsaturated  soils Résumé : Explicit empirical relationships for correcting liquefaction resistance of unsaturated soil below the groundwater table using compression wave velocity (VP) and shear wave velocity (VS) are derived and evaluated in this paper. The relationships are derived using published laboratory test data for four different sands and one silt material. The laboratory test data based on VP exhibit less scatter than the test data based on the ratio VP/VS. For this reason, the VP-based relationship is recommended for correcting the liquefaction resistance of unsaturated soil. The influence of loading cycles and relative density on the recommended relationship is investigated. From a review of 40 field case history sites, it is found that in the critical layers at 20% of the sites, average VP is less than 1,400 m/s, indicating unsaturated conditions. Liquefaction resistances computed for eight field case histories with VP<1,200 m/s in the critical layers are corrected and plotted on penetration- and VS-based liquefaction evaluation charts. The results support the use of the correction for unsaturated conditions below the groundwater table. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000770