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Correcting liquefaction resistance for aged sands using measured to estimated velocity ratio / Ronald D. Andrus in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 6 (Juin 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 735–744 Titre : Correcting liquefaction resistance for aged sands using measured to estimated velocity ratio Type de document : texte imprimé Auteurs : Ronald D. Andrus, Auteur ; Hossein Hayati, Auteur ; Nisha P. Mohanan, Auteur Année de publication : 2009 Article en page(s) : pp. 735–744 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Aging  Sand  Cone  penetration  tests  Earthquakes  In  situ  tests  Soil  liquefaction  Wave  velocity  Penetration  tests Résumé : Factors for correcting liquefaction resistance for aged sands using ratios of measured to estimated shear-wave velocity (MEVR) are derived in this paper. Estimated values of shear-wave velocity (VS) are computed for 91 penetration resistance- VS data pairs using previously published relationships. Linear regression is performed on values of MEVR and corresponding average age. Age of the sand layer is taken as the time between VS measurements and initial deposition or last critical disturbance. It is found that MEVR increases by a factor of about 0.08 per log cycle of time, and time equals about 6years on average when MEVR equals 1 for the recommended penetration resistance- VS relationships. The resulting regression equation is combined with the strength gain equation reported by Hayati et al. 2008 in “Proc., Geotechnical Earthquake Engineering and Soil Dynamics IV,” to produce a MEVR versus deposit resistance correction relationship. This new corrective relationship is applied to create liquefaction resistance curves based on VS , standard penetration test blow count, and cone tip resistance for sands of various ages (or MEVRs). Because age of natural soil deposits is usually difficult to accurately determine, MEVR appears to be a promising alternative. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000025 [article] Correcting liquefaction resistance for aged sands using measured to estimated velocity ratio [texte imprimé] / Ronald D. Andrus, Auteur ; Hossein Hayati, Auteur ; Nisha P. Mohanan, Auteur . - 2009 . - pp. 735–744. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 735–744 Mots-clés : Aging  Sand  Cone  penetration  tests  Earthquakes  In  situ  tests  Soil  liquefaction  Wave  velocity  Penetration  tests Résumé : Factors for correcting liquefaction resistance for aged sands using ratios of measured to estimated shear-wave velocity (MEVR) are derived in this paper. Estimated values of shear-wave velocity (VS) are computed for 91 penetration resistance- VS data pairs using previously published relationships. Linear regression is performed on values of MEVR and corresponding average age. Age of the sand layer is taken as the time between VS measurements and initial deposition or last critical disturbance. It is found that MEVR increases by a factor of about 0.08 per log cycle of time, and time equals about 6years on average when MEVR equals 1 for the recommended penetration resistance- VS relationships. The resulting regression equation is combined with the strength gain equation reported by Hayati et al. 2008 in “Proc., Geotechnical Earthquake Engineering and Soil Dynamics IV,” to produce a MEVR versus deposit resistance correction relationship. This new corrective relationship is applied to create liquefaction resistance curves based on VS , standard penetration test blow count, and cone tip resistance for sands of various ages (or MEVRs). Because age of natural soil deposits is usually difficult to accurately determine, MEVR appears to be a promising alternative. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000025