1. College of Civil Engineering and Mechanics, Lanzhou University, 222 Tianshui South Rd., Chengguan District, Lanzhou, Gansu 730000, PR China
2. Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education of China, Lanzhou, Gansu 730000, PR China
3. College of Civil Engineering and Mechanics, Lanzhou University, 222 Tianshui South Rd., Chengguan District, Lanzhou, Gansu 730000, PR China (Corresponding author), e-mail: zhangjink@lzu.edu.cn, https://orcid.org/0000-0002-7421-3979