1. Lecturer, Dept. of Underground Engineering, College of Mining Engineering, Taiyuan Univ. of Technology, 79 Yingze West St., Taiyuan 030024, Shanxi, P. R. China; Shanxi Coal Import and Export Group Co., Ltd., Taiyuan 030032, Shanxi, P. R. China (corresponding author). ORCID: .
2. Graduate Student, Dept. of Underground Engineering, College of Mining Engineering, Taiyuan Univ. of Technology, 79 Yingze West St., Taiyuan 030024, Shanxi, P. R. China.
3. Associate Professor, Dept. of Underground Engineering, College of Mining Engineering, Taiyuan Univ. of Technology, 79 Yingze West St., Taiyuan 030024, Shanxi, P. R. China.
4. Graduate Student, Dept. of Underground Engineering, College of Mining Engineering, Taiyuan University of Technology, 79 Yingze West St., Taiyuan 030024, Shanxi, P. R. China.
5. Associate Professor, College of Safety and Emergency Management Engineering, Taiyuan Univ. of Technology, Jinzhong 030600, Shanxi, P. R. China.