School of Resource and Safety;
Anhui University of Science and Technology;
Huainan 232001;
China;
Key Laboratory of High Efficiency Coal Exploitation and Gas Extraction of Anhui Province;
Huainan 232001;
China;
Key Laboratory of Integrated Coal Exploitation and Gas Extraction of Anhui Province;
Huainan 232001;
China;
Department of Mining Engineering;
West Virginia University;
Morgantown 26505;
USA;