1. Ph.D. Candidate, Dept. of Highway and Railway Engineering, Beijing Jiaotong Univ., No. 3 Shangyuancun, Beijing 100044, PR China. ORCID: .
2. Professor, Dept. of Highway and Railway Engineering, Beijing Jiaotong Univ., No. 3 Shangyuancun, Beijing 100044, PR China (corresponding author).
3. Associate Research Fellow, Railway Engineering Research Institute, China Academy of Railway Sciences Co. Ltd., No. 2 Daliushu Rd., Beijing 100044, PR China.
4. Research Fellow, Infrastructure Inspection Research Institute, China Academy of Railway Sciences Co. Ltd., No. 2 Daliushu Rd., Beijing 100044, PR China.