1. Researcher, Key Laboratory of Transportation Tunnel Engineering Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China; Chief Engineer, China Petroleum Pipeline Engineering Co., Ltd., No. 146 Heping Rd., Guangyang District, Langfang 065000, China.
2. Professor, Key Laboratory of Transportation Tunnel Engineering Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China (corresponding author).
3. Ph.D. Candidate, Key Laboratory of Transportation Tunnel Engineering Ministry of Education, Southwest Jiaotong Univ., Chengdu 610031, China.
4. Engineer, China Petroleum Pipeline Engineering Co., Ltd., No. 146 Heping Rd., Guangyang District, Langfang 065000, China.