| Titre : | Strain-rate effects in Mexico city soil (2009) |
| Auteurs : | J. Abraham Díaz-Rodríguez, Auteur ; J. José Martínez-Vasquez, Auteur ; J. Carlos Santamarina, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of geotechnical and geoenvironmental engineering (Vol. 135 N°2, Février 2009) |
| Article en page(s) : | pp. 300–305 |
| Note générale : | Geotechnical and geoenvironmental engineering |
| Langues : | Anglais |
| Tags : | 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%28300%29 |
