Documents disponibles écrits par cet auteur

Correlation between cyclic resistance and shear-wave velocity for providence silts / Christopher D. P. Baxter in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 37–46 Titre : Correlation between cyclic resistance and shear-wave velocity for providence silts Type de document : texte imprimé Auteurs : Christopher D. P. Baxter, Auteur ; Aaron S. Bradshaw, Auteur ; Russell A. Green, Auteur Année de publication : 2008 Article en page(s) : pp. 37–46 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Silts  Liquefaction  Cyclic  tests  Shear  waves  Velocity Résumé : As an alternative to a field-based liquefaction resistance approach, cyclic triaxial tests with bender elements were used to develop a new correlation between cyclic resistance ratio (CRR) and overburden stress-corrected shear-wave velocity (VS1) for two nonplastic silts obtained from Providence, Rhode Island. Samples of natural nonplastic silt were recovered by block sampling and from geotechnical borings/split-spoon sampling. The data show that the correlation is independent of the soils’ stress history as well as the method used to prepare the silt for cyclic testing. The laboratory results indicate that using the existing field-based CRR-VS1 correlations will significantly overestimate the cyclic resistance of the Providence silts. The strong dependency of the CRR-VS1 curves on soil type also suggests the necessity of developing silt-specific liquefaction resistance curves from laboratory cyclic tests performed on reconstituted samples. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2837 [...] [article] Correlation between cyclic resistance and shear-wave velocity for providence silts [texte imprimé] / Christopher D. P. Baxter, Auteur ; Aaron S. Bradshaw, Auteur ; Russell A. Green, Auteur . - 2008 . - pp. 37–46. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 37–46 Mots-clés : Silts  Liquefaction  Cyclic  tests  Shear  waves  Velocity Résumé : As an alternative to a field-based liquefaction resistance approach, cyclic triaxial tests with bender elements were used to develop a new correlation between cyclic resistance ratio (CRR) and overburden stress-corrected shear-wave velocity (VS1) for two nonplastic silts obtained from Providence, Rhode Island. Samples of natural nonplastic silt were recovered by block sampling and from geotechnical borings/split-spoon sampling. The data show that the correlation is independent of the soils’ stress history as well as the method used to prepare the silt for cyclic testing. The laboratory results indicate that using the existing field-based CRR-VS1 correlations will significantly overestimate the cyclic resistance of the Providence silts. The strong dependency of the CRR-VS1 curves on soil type also suggests the necessity of developing silt-specific liquefaction resistance curves from laboratory cyclic tests performed on reconstituted samples. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2837 [...]

Pore pressure generation models for sands and silty soils subjected to cyclic loading / Carmine P. Polito in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°10 (Octobre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°10 (Octobre 2008) . - pp. 1490–1500 Titre : Pore pressure generation models for sands and silty soils subjected to cyclic loading Type de document : texte imprimé Auteurs : Carmine P. Polito, Auteur ; Russell A. Green, Auteur ; Jongwon Lee, Auteur Année de publication : 2008 Article en page(s) : pp. 1490–1500 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Dynamic  analysis  Pore  pressure  Regression  models  Silts  Sands  Cyclic  loads Résumé : This paper discusses the applicability of two simple models for predicting pore water pressure generation in nonplastic silty soil during cyclic loading. The first model was developed by Seed et al. in the 1970s and relates the pore pressure generated to the cycle ratio, which is the ratio of the number of applied cycles of loading to the number of cycles required to cause liquefaction. The second model is the Green-Mitchell-Polito model proposed by Green et al. in 2000, which relates pore pressure generation to the energy dissipated within the soil. Based upon the results of approximately 150 cyclic triaxial tests, the writers show that both models are applicable to silty soils. A nonlinear mixed effects model was used for regression analyses to develop correlations for the necessary calibration parameters. The results show that the trends in both α and pseudoenergy capacity calibration parameters for the Seed et al. and Green et al. pore pressure generation models, respectively, differ significantly for soils containing less than and greater than ∼35% fines, consistent with the limiting fines content concept. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A10%281 [...] [article] Pore pressure generation models for sands and silty soils subjected to cyclic loading [texte imprimé] / Carmine P. Polito, Auteur ; Russell A. Green, Auteur ; Jongwon Lee, Auteur . - 2008 . - pp. 1490–1500. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°10 (Octobre 2008) . - pp. 1490–1500 Mots-clés : Dynamic  analysis  Pore  pressure  Regression  models  Silts  Sands  Cyclic  loads Résumé : This paper discusses the applicability of two simple models for predicting pore water pressure generation in nonplastic silty soil during cyclic loading. The first model was developed by Seed et al. in the 1970s and relates the pore pressure generated to the cycle ratio, which is the ratio of the number of applied cycles of loading to the number of cycles required to cause liquefaction. The second model is the Green-Mitchell-Polito model proposed by Green et al. in 2000, which relates pore pressure generation to the energy dissipated within the soil. Based upon the results of approximately 150 cyclic triaxial tests, the writers show that both models are applicable to silty soils. A nonlinear mixed effects model was used for regression analyses to develop correlations for the necessary calibration parameters. The results show that the trends in both α and pseudoenergy capacity calibration parameters for the Seed et al. and Green et al. pore pressure generation models, respectively, differ significantly for soils containing less than and greater than ∼35% fines, consistent with the limiting fines content concept. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A10%281 [...]