1. Research Assistant, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634; Institute of Geotechnical Engineering, Nanjing Tech Univ., Nanjing 210009, China.
2. Assistant Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634; Institute of Geotechnical Engineering, Nanjing Tech Univ., Nanjing 210009, China.
3. Professor, Nanjing Tech Univ., Nanjing 210009, China; Institute of Geotechnical Engineering, Nanjing Tech Univ., Nanjing 210009, China.
4. Glenn Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.