1. Lecturer and Research Assistant, Laboratory of Civil Engineering and Geo-Environment, Polytech’Lille, Univ. Lille 1 Sciences and Technologies, Villeneuve d’Ascq 59655, France (corresponding author).
2. Professor, Laboratory of Civil Engineering and Geo-Environment, Polytech’Lille, Univ. Lille 1 Sciences and Technologies, Villeneuve d’Ascq 59655, France.
3. Assistant Professor, Laboratory of Civil Engineering and Geo-Environment, Polytech’Lille, Univ. Lille 1 Sciences and Technologies, Villeneuve d’Ascq 59655, France.
4. Professor, Laboratory of Engineering Geology, Dept. of Earth Sciences, Faculty of Science, Univ. of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon.