1. Professor, Geotechnical Engineering Research Institute, Hohai Univ., Nanjing 210098, China (corresponding author).
2. Graduated Student, Geotechnical Engineering Research Institute, Hohai Univ., Nanjing 210098, China.
3. Geotechnical and Geoenvironmental Engineering Specialist, Michigan Dept. of Environmental Quality, Office of Waste Management and Radiological Protection, 525 West Allegan, Lansing, MI 48933.
4. Research Assistant, Geotechnical Engineering Research Institute, Hohai Univ., Nanjing 210098, China.