1. School of Science, Lanzhou University of Technology, Lanzhou, China
2. School of Civil and Transportation Engineering, Qinghai Minzu University, Xining, China
3. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, China
4. Key Laboratory of Rail Transit Service Environment and Intelligent Operation & Maintenance of Gansu Province, School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, China