1. Ph.D. Candidate, Civil, Geological and Mining Engineering Dept., Ecole Polytechnique of Montréal, P.O. Box 6079, Station Centre-ville, Montreal, QC, Canada H3C 3A7.
2. Professor, Civil, Geological and Mining Engineering Dept., Ecole Polytechnique of Montréal, P.O. Box 6079, Station Centre-ville, Montreal, QC, Canada H3C 3A7 (corresponding author).