1. Research Assistant, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
2. Assistant Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
3. Professor, MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang Univ., Hangzhou 310027, China; and College of Architecture and Civil Engineering, Wenzhou Univ., Wenzhou 325035, China.
4. Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634; and National Central Univ., Jungli, Taoyuan 32001, Taiwan (corresponding author).