Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Résumé

Triaxial experiments have been carried out on atmospheric ice samples under various conditions. Samples have been obtained from ice accumulated on a rotating cylinder inside the INGIVRE (Canada Research Chair on Atmospheric Icing Engineering of Power Networks) icing wind tunnel. Samples were tested at the same temperature at which they had been accumulated: at − 5, − 10 and − 15 °C under three strain rates 10− 4, 10− 3 and 10− 2 s− 1. Tests were conducted under various confinement pressures. At a temperature close to the melting point, atmospheric ice strength increases up to a certain value of confinement, and then decreases significantly. In the case where atmospheric ice strength increases continuously with increasing confinement for lower temperatures, the Mohr-Coulomb and Hoek-Brown failure criteria have been investigated in order to predict the failure of atmospheric ice.