1. Lecturer, College of Civil Engineering and Mechanics, Lanzhou Univ., Lanzhou, Gansu 730000, PR China; Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou, 730000 Gansu, PR China.
2. Professor, College of Civil Engineering and Mechanics, Lanzhou Univ., Lanzhou, Gansu 730000, PR China; Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou, 730000 Gansu, PR China (corresponding author).
3. Professor, College of Civil Engineering and Mechanics, Lanzhou Univ., Lanzhou, Gansu 730000, PR China; Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou, 730000 Gansu, PR China.
4. Doctor, College of Civil Engineering and Mechanics, Lanzhou Univ., Lanzhou, Gansu 730000, PR China.
5. Graduate Student, College of Civil Engineering and Mechanics, Lanzhou Univ., Lanzhou, Gansu 730000, PR China.