School of Resource Environment&Safety Engineering Hunan University of Science&Technology Xiangtan 411201 China;
Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan University of Science&Technology Xiangtan 411201 China;
Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science&Technology Xiangtan 411201 China;
Work Safety Key Lab On Prevention and Control of Gas and Roof Disasters for Southern Coal Mines Hunan University of Science&Technology Xiangtan 411201 China;
School of Resource Environment&Safety Engineering Hunan University of Science&Technology Xiangtan 411201 China;
Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science&Technology Xiangtan 411201 China;