Affiliation: | Ground Engineering Department, Civil Engineering School, Technical University of Catalonia, C/Jordi Girona, 1-3C, 08034-Barcelona, Spain. Present address: QuantiSci, S.L., Pare Tecnologic del Valles, 08290- Cerdanyola (Barcelona) Spain. E-mail:;phone: +34-3-5824410;fax: +34-3-5824412. |