1. Civil and Environmental Building, Dept. of Civil Engineering, Beijing Jiaotong University, Shangyuancun 3rd, Beijing 100044, China
2. China Railway Fifth Survey and Design Institute Group Co.,Ltd., Beijing 102600, China
3. Subway Operation Technology R & D Center of Beijing Subway, Beijing 102208, China
4. Beijing Municipal Commission of Housing and Urban-Rural Development, Beijing 101107, China