1. Ph.D. Candidate, Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji Univ., Shanghai, 200092, P.R., China; and Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996 (corresponding author).
3. Research Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
4. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN, 37996.