1. Associate Professor, Dept. of Civil Engineering, Shanghai Jiao Tong Univ., 800 Dongchuan Rd., Shanghai 200240, China (corresponding author).
2. Chief Engineer, Shanghai Tunnel Engineering Co., Ltd., 118 Dalian Rd., Shanghai 200082, China.
3. Ph.D. Student, Dept. of Civil Engineering, Shanghai Jiao Tong Univ., 800 Dongchuan Rd., Shanghai 200240, China.
4. Senior Engineer, Shanghai Tunnel Engineering Co., Ltd., 118 Dalian Rd., Shanghai 200082, China.