1. Senior Geotechnical Engineer, Wood E & ISCalgary, AB, Canada T2E 7T8; Assistant Professor, Dept. of Civil Engineering, Faculty of Engineering (Shoubra), Benha Univ., Benha 11672, Egypt (corresponding author). Email: melkasab@alumni.uwo.ca
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Western Ontario, London, ON, Canada N6G 1G8.