Effects of stress history of sand on the shaft resistance of large displacement piles

Fabrizio Di Camillo, Rouzbeh Vakili, Adel Hanna

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Foundations V

ABSTRACT: An experimental investigation on the coefficient of earth pressure of overconsolidated cohesionless soil around large displacement model piles was conducted. Overconsolidation was achieved by placing the soil in the testing tank in layers applying a different compaction effort to each test series. The stresses in the sand mass were measured by way of pressure transducer units placed in the deposit. The instrumented pile was driven into the sand mass to a selected depth and unloaded. The pile load test was then started at a constant rate of penetration. The process was then repeated for different relative depths. The ultimate load capacity was determined from load-displacement curves. It is of interest to note that the shaft resistance and, hence, the coefficient of earth pressure around the pile showed significant dependency on the state of overconsolidation of the sand mass.

RÉSUMÉ: Une enquête expérimentale sur le coefficient de pression de la terre de sol pulvérulent surconsolidée autour de grands déplacements de pieux prototypes a été effectuée. La surconsolidation a été réalisée en plaçant les couches de sol dans le réservoir d'essai en appliquant un effort de compactage différent pour chaque série d'essais. Les contraintes dans la masse de sable ont été mesurées au moyen d'unités de transducteurs de pression placés dans le gisement. Le pieu pieu est ensuite commencé à une vitesse de pénétration constante. Le processus a ensuite été répété pour différentes profondeurs relatives. La capacité de charge limite a été déterminée à partir des courbes charge-déplacement. Il est oefficient de pression de la terre autour du pieu ont montré une dépendance importante sur l'état de surconsolidation de la masse de sable.

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Cite this article:
Fabrizio Di Camillo; Rouzbeh Vakili; Adel Hanna (2013) Effects of stress history of sand on the shaft resistance of large displacement piles in GEO2013. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GeoMon2013Paper335,author = Fabrizio Di Camillo; Rouzbeh Vakili; Adel Hanna,title = Effects of stress history of sand on the shaft resistance of large displacement piles ,year = 2013}