1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesChina University of Mining and Technology Beijing 100083 China
2. School of Resource and Safety Engineering, China University of Mining and Technology Beijing 100083 China
3. State Key Laboratory Cultivation Base for Gas Geology and Gas ControlHenan Polytechnic University Jiaozuo 454000 China
4. Fire Corps of Henan Province Zhengzhou City 450008 Henan China