1. Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, College of Mining and Safety Engineering; Shandong University of Science and Technology; Qingdao 266590 China
2. College of Mining and Safety Engineering; Shandong University of Science and Technology; Qingdao Shandong 266590 China
3. Research Center of Coal Resources Safe Mining and Clean Utilization; Liaoning Technical University; Fuxin 123000 China