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Experiments on the failure of slopes made of loose sand due to the rise in water level

Reza Imam, Vahid Masumi Fard

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: M3-C

ABSTRACT: A rise in pore water pressure in a soil mass leads to a decrease in the mean effective normal stress, while the vertical gravitational loads may change only slightly. Very loose sand may contract substantially under such loading as failure is approached and, under poor drainage, this can lead to the increase in pore pressure, loss of strength and, consequently, failure of the soil mass. Using results of experiments carried out in a test tank, this paper shows that slope instability resulting from rises in water level is controlled by sand density, pore pressure distribution, and rate of rise in water level.

RÉSUMÉ: Une hausse de la pression interstitielle dans une masse de sol conduit à une diminution de l'efficacité moyenne des efforts, alors que des charges verticales de gravité peut varier légèrement. Très sable meuble peut contracter sensiblement sous chargement tels que la défaillance est abordé et, sous un mauvais drainage, ce qui peut entraîner une augmentation des pressions interstitielles, perte de force et, par conséquent, l'échec de la masse du sol. Utilisation des résultats des expériences réalisées dans un réservoir d'essai, ce document montre que l'instabilité des pentes résultant de l'élévation du niveau d'eau est contrôlée par la densité du sable, de la distribution de la pression interstitielle, et le taux d'élévation du niveau de l'eau.

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Cite this article:
Reza Imam; Vahid Masumi Fard (2010) Experiments on the failure of slopes made of loose sand due to the rise in water level in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO2010_132, author = Reza Imam; Vahid Masumi Fard,
title = Experiments on the failure of slopes made of loose sand due to the rise in water level,
year = 2010
}