1. Associate Professor, School of Civil Engineering, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, China (corresponding author).
2. Ph.D. Candidate, School of Civil Engineering, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, China.
3. Researcher, Research Institute of Highway, Ministry of Transport, No. 8 West Tucheng Rd., Haidian District, Beijing 100088, China.
4. Professor, School of Civil Engineering, Beijing Jiaotong Univ., No. 3 Shangyuancun, Haidian District, Beijing 100044, China.
5. China Railway Fifth Survey and Design Institute Group Co., Ltd, No. 9 Kangzhuang Road, Daxing District, Beijing 102600, China.