1. Ministry of Education (MOE) Key Lab of Soft Soils and Geo-Environmental Engineering, Zhejiang Univ., Hangzhou, China.
2. Dept. of Mechanical and Aerospace Engineering, Univ. of Miami, Coral Gables, FL 33124.
3. Teledyne Scientific Co. LLC, Thousand Oaks, CA 91360.
4. Dept. of Mechanical and Aerospace Engineering, Univ. of Miami, Coral Gables, FL 33124 (corresponding author).