1. Inner Mongolia Research Institute, China University of Mining and Technology (Beijing), Ordos 017001, China
2. National Engineering Research Center of Coal Mine Water Hazard Controlling, Beijing 100083, China
3. Key Laboratory of Mine Water Control and Resources Utilization, National Mine Safety Administration, China University of Mining and Technology, Beijing 100083, China
4. College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China