1. Associate Professor, Dept. of Civil Engineering, Aristotle Univ. of Thessaloniki, 54124 Thessaloniki, Greece Dept. of Civil Engineering, Univ. of Bristol, Bristol BS8 1TR, U.K. (corresponding author).
2. Ph.D. Student, Dept. of Civil Engineering, Aristotle Univ. of Thessaloniki, 54124 Thessaloniki, Greece.
3. Research Associate and Lecturer, Bauhaus-Univ. Weimar, Marienstrasse 15, 99421 Weimar, Germany.
4. Professor, Chair of Marine and Land Geomechanics and Geotechnics, Kiel Univ., Ludewig-Meyn St. 10, 24118 Kiel, Germany; formerly, Bauhaus-Univ. Weimar, Faculty Civil Engineering, Coudraystrasse 11C, 99423 Weimar, Germany.
5. Ph.D. Student, Bauhaus-Univ. Weimar, Coudraystrasse 11c, 99423 Weimar, Germany.
6. Head, Capital Maintenance Dept., Egnatia Odos S.A., 60km Thessaloniki-Thermi, 57001 Thermi, Greece.