1. Professor, Civil Engineering Department, Federal University of Pernambuco, Av. Acadêmico Hélio Ramos, s/n, 50740-530, Recife-PE, Brazil.
2. Professor, Department of Geotechnical Engineering and Geoscience, Technical University of Catalonia, Campus Nord, Building D2, Jordi Girona 1-3, 08034, Barcelona, Spain.