1. Institute of Superconductors Mechanics, Lanzhou University 1 , Gansu 730000, China
2. Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Lanzhou University 2 , Lanzhou, Gansu 730000, China
3. Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University 3 , Lanzhou, Gansu 730000, China