1. Department of Geotechnics and Roads, Faculty of Civil Engineering, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
2. Faculty of Civil Engineering, Wroclaw University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland
3. GEART, s.r.o, P.O. Hviezdoslava 42A, 010 01 Žilina, Slovakia