1. Ph.D. Candidate, Laboratory of Geotechnics, Ghent Univ., Technologiepark 905, B-9052 Zwijnaarde, BE (Corresponding author), e-mail: shenhao.geo@gmail.com
2. Professor, Laboratory of Geotechnics, Ghent Univ., Technologiepark 905, B-9052 Zwijnaarde, BE, e-mail: wim.haegeman@ugent.be
3. Professor, Laboratory of Geotechnics, Ghent Univ., Technologiepark 905, B-9052 Zwijnaarde, BE, e-mail: herman.peiffer@ugent.be