1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, China
2. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, China
3. Department of Civil Engineering, University of Bristol, Bristol, UK
4. Department of Earth Sciences, Western University, London, Ontario, Canada
5. Department of Statistical and Actuarial Sciences, Western University, London, Ontario, Canada