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TitreExperimental and analytical study of seismic site response of discontinuous permafrost
AuteurDadfar, B; El, Naggar, M H; Nastev, M
SourceCanadian Geotechnical Journal vol. 53, 9, 2016 p. 1363-1375, https://doi.org/10.1139/cgj-2015-0223
Année2016
ÉditeurCanadian Science Publishing
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1139/cgj-2015-0223
Mediapapier; en ligne; numérique
ProgrammeÉvaluation rapide des risques, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
Seismic site response of discontinuous permafrost is discussed. The presence of frozen ground in soil deposits can significantly affect their dynamic response due to stiffer conditions characterized by higher shear-wave velocities compared to unfrozen soils. Both experimental and numerical investigations were conducted to examine the problem. The experimental program included a series of 1g shaking table tests on small-scale models. Nonlinear numerical analyses were performed employing FLAC software. The numerical model was verified using the obtained experimental results. Parametric simulations were then conducted using the verified model to study variations of the free-field spectral accelerations (on top of the frozen and unfrozen soil blocks) with the scheme of frozen-unfrozen soil, and to determine the key parameters and their effects on seismic site response. Results show that spectral accelerations were generally higher in frozen soils than in unfrozen ones. It was found that the shear-wave velocity of the frozen soil as well as the assumed geometry of the blocks and their spacing have a significant impact on the site response.
GEOSCAN ID310950