1. Assistant Professor, Dept. of Geotechnical Engineering, College of Civil Engineering, Tongji Univ., Shanghai 200092, China (corresponding author).
2. Engineer, Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Tongji Univ., Shanghai 200092, China.
3. Ph.D. Student, Dept. of Civil Engineering, University of Tokyo, Tokyo 113-8656, Japan.
4. Engineer, Kiso-Jiban Consultants Co., Ltd., Tokyo 102-8220, Japan.
5. Professor, Dept. of Civil Engineering, Univ. of Tokyo, Tokyo 113-8656, Japan.