1. Vice Dean, State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing 100013, China; Rock Mechanics Specialist, Mining & Designing Branch, China Coal Research Institute, Beijing 100013, China (corresponding author).
2. Dean, State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing 100013, China; Vice Director, Mining & Designing Branch, China Coal Research Institute, Beijing 100013, China.