1. Ph.D. Candidate, Dept. of Civil and Geological Engineering, Univ. of Saskatchewan, 57 Campus Dr., Saskatoon SK, Canada S7N 5A9. E-mail: hoa251@mail.usask.ca
2. Professor, Dept. of Civil and Geological Engineering, Univ. of Saskatchewan, 57 Campus Dr., Saskatoon SK, Canada S7N 5A9. E-mail: Jim.Kells@usask.ca