1. Researcher, Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr-Univ. Bochum, Bochum 44780, Germany (corresponding author).
2. Researcher, Institute of Hydrogeology, Engineering Geology, and Applied Geophysics, Charles Univ., Prague, Czech Republic.Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. de la Costa, Barranquilla 12800, Colombia.
3. Professor, Institute of Hydrogeology, Engineering Geology and Applied Geophysics, Charles Univ., Prague 12800, Czech Republic.
4. Professor, Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr-Univ. Bochum, Bochum 44780, Germany.