1. Lecturer, Dept. of Geotechnical Engineering, Faculty of Civil Engineering, Univ. of Tabriz, 29 Bahman Blvd., Tabriz, Iran.
2. Professor, Dept. of Geotechnical Engineering, Faculty of Civil Engineering, Univ. of Tabriz, 29 Bahman Blvd., Tabriz, Iran.
3. Visiting Researcher, Dept. of Bioresource Engineering, McGill Univ., Sainte-Anne-de-Bellevue, QC, Canada H9X 3V9.
4. Professor, Dept. of Bioresource Engineering, McGill Univ., Sainte-Anne-de-Bellevue, QC, Canada H9X 3V9 (corresponding author).