1. State Key Laboratory of Production Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2. Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
3. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
4. China Minmetals Corporation, Jinan 271100, China