1. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, China
2. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
3. Xuzhou Coal Mining Group, Xuzhou 221000, China
4. Department of Energy and Mineral Engineering, G3 Center and Energy Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States