1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.
3. School of Civil Engineering and Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China.