1. Engineer, Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, 2500 Chemin de Polytechnique, Montreal, QC, Canada H3C 3A7 (corresponding author).
2. Engineer, Hydro-Québec Production, 75 Blvd. René-Lévesque Ouest, Montreal, QC, Canada H2Z 1A4.
3. Associate Professor, Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, 2500 Chemin de Polytechnique, Montreal, QC, Canada H3C 3A7.