A large oedometer cell to study assemblages of rock particles

Vincent Cormier, Jean-Marie Konrad

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

Session: Earth Walls and Dams III

ABSTRACT: A special oedometer cell has been developed to study the behavior of rockfill during construction and impoundment of rockfill dams. One of the major difficulties of one-dimensional compression testing is that a part of the vertical load applied on a specimen is transferred to the inside walls of the oedometer cell by friction. Thus, the vertical stress distribution along the specimen depth is not constant. The friction component was measured for specimens of different heights and different grading in order to highlight the influence of those two parameters. The results show that friction increases with increasing height of specimen while unit shear stress at the wall decreases with increasing height. The results also show that the friction appears to increase with increasing void ratio. It is observed that the presence of water induces vertical deformations that slightly influence side friction.

RÉSUMÉ: Une cellule oedométrique a été énients majeurs des essais de compression uniaxiale dans une cellule e frottement. Par conséquent, la distribution de la contrainte verticale sconstante. La force de frottement a été mesurée pour différents échantillons de hauteur et de granulométries différentes. Les résultats démontrent que le frottement augmente et que le frottement unitaire diminue à mesure que la hauteur de Il a également été observé que le frottement tend à être plus élevé pour des échantillons dont . ence sur le frottement.

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