1. School of Civil Engineering and Architecture, Qingdao Huanghai University, Qingdao, Shandong, China
2. School of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an, China
3. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing, China
4. School of Safety Engineering, North China Institute of Science and Technology, Langfang, Hebei, China