1. Professor, Geotechnical Research Institute, Hohai Univ., Nanjing 210098, China. E-mail: hliu@mailsvr.hhu.edu.cn
2. Professor, Dept. of Civil Engineering, Hong Kong Univ. Science and Technology, Clear Water Bay, Kowloon, HKSAR. E-mail: cecwwng@ust.hk
3. Associate Professor, Geotechnical Research Institute, Yangzhou Univ., Yangzhou 225009, China. E-mail: fei_kang@sohu.com