Shear strength and retention models of a partially saturated riverbank silty soil Mariagiovanna Moscariello, Carmine Gerardo Gragnano, Sabatino Cuomo, Irene Rocchi and Guido Gottardi E3S Web Conf., 195 (2020) 01011 Published online: 16 October 2020 DOI: 10.1051/e3sconf/202019501011