1. Geotechnical Dept., MOTA-ENGIL, Engenharia e Construção, Rua Rego do Lameiro, 38, 4300-454 Porto, PT
2. CONSTRUCT-GEO, Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, s/n 4200-465 Porto, PT (Corresponding author), e-mail: sara.rios@fe.up.pt
3. Transportation Dept., National Laboratory for Civil Engineering, Avenida do Brasil, 101, 1700-066 Lisboa, PT
4. Polytechnic Inst. of Guarda, Av. Dr. Francisco Sá Carneiro, 50, 6300-559 Guarda, PT
5. Faculty of Engineering, Univ. of Porto, Rua Dr. Roberto Frias, s/n 4200-465 Porto, PT