1. Professor, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology (Beijing), Beijing 100083, China (corresponding author).
2. Graduate Student, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology (Beijing), Beijing 100083, China.
3. Lecturer, School of Mechanics and Civil Engineering, China Univ. of Mining and Technology (Beijing), Beijing 100083, China.
4. Senior Engineer, General Contract Dept. of Rail Transit and Municipal Engineering, Beijing Uni-Construction Group Co. Ltd, Beijing 100029, China.