1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, China
2. Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology), Huainan, China
3. College of Civil & Structural Engineering, Shandong University of Science and Technology, Qingdao, China
4. State Key Laboratory of Coal Mine Safety Technology, China Coal Technology & Engineering Group Shenyang Research Institute, Shenyang, China