SHORT AND LONG TERM COMPRESSIBILITY OF ROCK PARTICLE ASSEMBLAGES

Vincent Cormier, Jean-Marie Konrad

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Embankments and Dams / Remblais et barrages

ABSTRACT: During construction and first impoundment of rockfill dams, significant deformations can occur due to crushing of highly stressed rock particles. In order to improve the general understanding of this phenomenon, short term and long term compressibility of assemblages of rock particles was studied with one-dimensional compression tests in a large oedometer cell. The main results from the test program revealed that short term compressibility tends to be more important for samples with a wide grain size distribution curve, a low density and when the samples were wetted or saturated prior to loading. With respect to long term compressibility, it appears that the ratio between the time-dependent compressibility index and the compressibility index, C/C, tends toward a constant of about 0.02 for dry rock particles and 0.03 for saturated samples. Furthermore, the compressibility was successfully related to a breakage factor, highlighting the importance of particle breakage on deformations of rockfill.

RÉSUMÉ: que la granulométrique plus étalé, de faible masse volumique et pour des assemblages préalablement saturés ou humidifiés. Il a également été démontré que le ratio en,t/C,, est de 0,02 pour les échantillons secs et de 0,03 pour les échantillons humides. Finalement léchantillons testés a confirmé la relation entre la fragmentation des particules et la compressibilité .

Please include this code when submitting a data update: GEO2015_572

Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.

Cite this article: