1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, PR China
2. Key Laboratory of Deep Geodrilling Technology, Ministry of Land and Resources, China University of Geosciences (Beijing), Beijing, PR China
3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil, Wuhan, PR China
4. China Academy of Safety Science and Technology, Institute of Occupational Hazards, Beijing, PR China