1. Ph.D. Student and Graduate Research Assistant, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609.
2. Glenn L. Parker Professor of Geotechnical Engineering, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609 (corresponding author).
3. Professor, Dept. of Geotechnical Engineering, Tongji Univ., 1239, Shanghai 200092, China.
4. Ph.D. Candidate and Graduate Research Assistant, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609.