[article] 
inJournal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 941–953

Titre :	Strain rate, creep, and stress drop-creep experiments on crushed coral sand
Type de document :	texte imprimé
Auteurs :	Poul V. Lade, Auteur ; Carl D. Liggio Jr., Auteur ; Jungman Nam, Auteur
Année de publication :	2009
Article en page(s) :	pp. 941–953
Note générale :	Geotechnical and geoenvironmental engineering
Langues :	Anglais (eng)
Mots-clés :	Creep Granular materials Sand Soil properties Strain rate Time dependence Triaxial tests
Résumé :	The part of sand behavior that is affected by time, such as creep, relaxation, and loading rate effects are not similar to those observed for clay. To throw more light on the time effects in sand, many series of drained triaxial compression experiments have been performed on crushed coral sand. These tests were all performed with a constant effective confining pressure of 200kPa . The test series included experiments with specimens loaded at five different strain rates with a 256-fold ratio between the extreme rates, tests with sudden changes in strain rate from slow to fast and vice versa, and tests in which axial and volumetric creep strains were observed at stress differences of 500, 700, and 900kPa . Creep creates structuration and this has to be overcome to produce further plastic straining. Experiments were also performed in which the stress difference was dropped quickly from three different values of 500, 700, and 900kPa followed by creep. In these stress drop-creep tests five different magnitudes of stress drops were employed: 0, 100, 200, 300, and 400kPa . The results involving conventional creep effects and stress drop-creep effects are presented and analyzed.
En ligne :	http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000067

[article] Strain rate, creep, and stress drop-creep experiments on crushed coral sand [texte imprimé] / Poul V. Lade, Auteur ; Carl D. Liggio Jr., Auteur ; Jungman Nam, Auteur . - 2009 . - pp. 941–953.
Geotechnical and geoenvironmental engineering
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 941–953

Mots-clés :	Creep Granular materials Sand Soil properties Strain rate Time dependence Triaxial tests
Résumé :	The part of sand behavior that is affected by time, such as creep, relaxation, and loading rate effects are not similar to those observed for clay. To throw more light on the time effects in sand, many series of drained triaxial compression experiments have been performed on crushed coral sand. These tests were all performed with a constant effective confining pressure of 200kPa . The test series included experiments with specimens loaded at five different strain rates with a 256-fold ratio between the extreme rates, tests with sudden changes in strain rate from slow to fast and vice versa, and tests in which axial and volumetric creep strains were observed at stress differences of 500, 700, and 900kPa . Creep creates structuration and this has to be overcome to produce further plastic straining. Experiments were also performed in which the stress difference was dropped quickly from three different values of 500, 700, and 900kPa followed by creep. In these stress drop-creep tests five different magnitudes of stress drops were employed: 0, 100, 200, 300, and 400kPa . The results involving conventional creep effects and stress drop-creep effects are presented and analyzed.
En ligne :	http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000067