1. Coal Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China
2. Engineering Geology and Resource Geotechnics Group, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada
3. State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, China
4. Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd., Beijing 100013, China
5. CCTEG Coal Mining Research Institute, Beijing 100013, China