1. Lecturer, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, SA 5005, Australia (corresponding author).
2. Lecturer, School of Civil Engineering, Tianjin Chengjian Univ., Tianjin, 300384, China; formerly, Graduate Student, Geotechnical Research Institute, MOE Key Laboratory for Geomechanics and Embankment Engineering, Hohai Univ., Nanjing, Jiangsu 210098, China.