1. Professor, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Univ. of Science and Technology, Xiangtan 411201, China; Professor, State Key Laboratory of Coal Resources and Safety Mining, China Univ. of Mining and Technology, Xuzhou 221008, China (corresponding author).
2. Delbert R. Lewis Distinguished Professor, Dept. of Civil Engineering and Engineering Mechanics, Univ. of Arizona, Tucson, AZ 85721.
3. Professor, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Univ. of Science and Technology, Xiangtan 411201, China.
4. Master Student, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan Univ. of Science and Technology, Xiangtan 411201, China.