1. Dept. of Civil, Geological and Mining Engineering, École Polytechnique, P.O. Box 6079, Stn. CV, Montreal, Quebec, CA, H3C 3A7, e-mail: robert.chapuis@polymtl.ca
2. Laboratory for Geotechnical and Geoenvironmental Engineering (LG2), École de Technologie Supérieure, 1100 Notre-Dame Ouest, Montreal, Quebec, CA, H3C 1K3, e-mail: francois.duhaime@etsmtl.ca