1. Researcher, Chair of Soil Mechanics and Foundation Engineering, Rock Mechanics and Tunneling, Technical Univ. of Munich, Baumbachstraße 7, 81245 Munich, Germany (corresponding author).
2. Project Engineer, Motorway Directorate of Southern Bavaria, Munich office (Autobahndirektion Südbayern, Dienststelle München), Bahnhofstraße 23, 82216 Maisach, Germany.
3. Senior Lecturer, Dept. of Civil Engineering, Federal Univ. of Rio Grande do Sul, Av. Osvaldo Aranha 99, 90035-190 Porto Alegre, Brazil.