1. Lecturer, Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong Univ., Beijing 100044, China.
2. Professor, Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong Univ., Beijing 100044, China (corresponding author).
3. Professor, Shenzhen Metro Group Co., Ltd., No. 1016, Fuzhong Rd., Shenzhen 518038, China.
4. Professor, Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong Univ., Beijing 100044, China.