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Effects of overconsolidation and the direction of principal stresses on liquefaction susceptibility of Fraser River sand

Mohammad Shahsavari, Siva Sivathayalan

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Soil Mechanics

ABSTRACT: The effect of overconsolidation ratio (OCR) on the cyclic response of Fraser River sand and its influence on correction factor are studied in this research. Cyclic triaxial tests were performed on overconsolidated samples that were prepared by water pluviation at three relative density states (19%, 40%, and 65%). Specimens were tested at a confining pressure of 100 kPa, but with different levels of initial static shear and OCR. It is observed that while overconsolidated sands have higher cyclic resistance, increasing OCR will adversely affect the correction factor. Also, a finegativefl initial static shear stress () could dramatically reduce the cyclic resistance and lead to flow failure of a soil which would fail due to cyclic mobility if the same amount of initial static shear stress is applied in the fipositivefl () direction.

RÉSUMÉ: L™effet du taux de surconsolidation (OCR) sur la réponse cyclique de sable du fleuve Fraser et de son influence sur le facteur de correction sont étudiés dans cette recherche. Essais triaxiaux cycliques ont été effectuées sur des échantillons surconsolidés qui ont été préparés par pluviation de l'eau à trois états de densité relative (19%, 40 % et 65 %). Les échantillons ont été testés à une pression de confinement de 100 kPa, mais avec différents niveaux de cisaillement statique initiale et OCR. On observe que, bien que les sables surconsolidés ont une résistance cyclique supérieure, augmentant OCR affecter le facteur de correction. En outre, une contrainte "négative" initiale de cisaillement statique () pourrait considérablement réduire la résistance cyclique et mener à couler l'échec d'un sol qui échouer en raison de la mobilité cyclique si la même quantité de contrainte initiale de cisaillement statique est appliqué dans le " positif " () direction.

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Cite this article:
Mohammad Shahsavari; Siva Sivathayalan (2014) Effects of overconsolidation and the direction of principal stresses on liquefaction susceptibility of Fraser River sand in GEO2014. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoRegina14Paper293, author = Mohammad Shahsavari; Siva Sivathayalan,
title = Effects of overconsolidation and the direction of principal stresses on liquefaction susceptibility of Fraser River sand,
year = 2014
}