1. Ph.D. Candidate, Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China.
2. Professor, Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China.
3. Assistant Professor, Engineering Geology, Underground Construction and Tunneling Dept. of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401.
4. Professor, Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China (corresponding author).
5. Senior Engineer, Beijing Urban Construction Development Group Co., Ltd., Beijing 100037, China.