1. Department of Earth Sciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China (Corresponding author), e-mail: li.dennis@hotmail.com, https://orcid.org/0000-0002-2499-5714
2. Department of Earth Sciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3. Department of Geology and Geological Engineering, University of Mississippi, PO Box 1848, University, MS 38677, USA
4. Institut und Versuchsanstalt für Geotechnik, Technische Universität Darmstadt, Franziska-Braun-Str. 7 Gebäude L5|01, 4. Stock, Raum 42564287 Darmstadt, Germany