Strain-rate effects in Mexico city soil / J. Abraham Díaz-Rodríguez in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N°2 (Février 2009)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 135 N°2 (Février 2009) . - pp. 300–305 Titre : Strain-rate effects in Mexico city soil Type de document : texte imprimé Auteurs : J. Abraham Díaz-Rodríguez, Auteur ; J. José Martínez-Vasquez, Auteur ; J. Carlos Santamarina, Auteur Année de publication : 2009 Article en page(s) : pp. 300–305 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Undisturbed soils Soil structures Strain rate Deposition Triaxial compression Strength Mexico Résumé : Mexico City soil has very high specific surface, plasticity and void ratio; its natural structure is preserved until the yield pressure σ′y , which is typically above the in situ effective stress σ′v , and the mechanical response changes significantly when the effective confining stress σ′o exceeds the yield pressure σ′y . In this study, the effects of strain rate on the undrained response of Mexico City soil are explored using undisturbed specimens subjected to monotonic triaxial compression tests at a constant rate of deformation. Results show that strain-rate effects on undrained strength and mode of failure depend on σ′y/σ′o , hence, on the degree of natural structure preserved in the specimen. Undrained strength increase with strain rate, particularly in the more structured specimens (i.e., higher σ′y/σ′o ). The role of σ′y/σ′o on strain-rate effects in this unremolded natural soil resembles the effect of overconsolidation ratio on resedimented specimens. The limitations in using standard triaxial equipment for strain-rate effect studies are discussed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A2%2830 [...] [article] Strain-rate effects in Mexico city soil [texte imprimé] / J. Abraham Díaz-Rodríguez, Auteur ; J. José Martínez-Vasquez, Auteur ; J. Carlos Santamarina, Auteur . - 2009 . - pp. 300–305. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N°2 (Février 2009) . - pp. 300–305 Mots-clés : Undisturbed soils Soil structures Strain rate Deposition Triaxial compression Strength Mexico Résumé : Mexico City soil has very high specific surface, plasticity and void ratio; its natural structure is preserved until the yield pressure σ′y , which is typically above the in situ effective stress σ′v , and the mechanical response changes significantly when the effective confining stress σ′o exceeds the yield pressure σ′y . In this study, the effects of strain rate on the undrained response of Mexico City soil are explored using undisturbed specimens subjected to monotonic triaxial compression tests at a constant rate of deformation. Results show that strain-rate effects on undrained strength and mode of failure depend on σ′y/σ′o , hence, on the degree of natural structure preserved in the specimen. Undrained strength increase with strain rate, particularly in the more structured specimens (i.e., higher σ′y/σ′o ). The role of σ′y/σ′o on strain-rate effects in this unremolded natural soil resembles the effect of overconsolidation ratio on resedimented specimens. The limitations in using standard triaxial equipment for strain-rate effect studies are discussed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A2%2830 [...]

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