A comparative study of critical failure surface in unsaturated soil slopes Abderrahim Mihoubi, Abdelkader Houam, Samir Benmoussa, Mohamed Salah Laouar, Ali Fernane, Salah Messast and Saida Gueraidia MATEC Web Conf., 394 (2024) 01005 Published online: 26 April 2024 DOI: 10.1051/matecconf/202439401005