1. Department of Civil Engineering, University of Bechar, Bechar, Algeria;
2. Laboratory of Materials and Hydrology (LMH), University of Sidi Bel Abbes, Sidi Bel Abbes, Algeria;
3. Mechanics Laboratory of Lille, CNRS UMR 8107, University of Lille 1, Villeneuve d’Ascq, France;
4. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia;
5. Department of Mathematics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt