1. Assistant Professor, Dept. of Engineering, Univ. of Palermo, Viale delle Scienze Ed. 8, 90128 Palermo, Italy (corresponding author). ORCID: .
2. Professor, Dept. of Engineering, Univ. of Palermo, Palermo, Italy; Dipartimento di Ingegneria, Università degli Studi di Palermo, Palermo, Italy; Laboratory of Soil Mechanics, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.