1. State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing, PR China
2. College of Mining, Liaoning Technical University, Fuxin, PR China
3. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, PR China
4. College of Mechanics and Engineering, Liaoning Technical University, Fuxin, PR China;
5. College of Science, Liaoning Technical University, Fuxin, PR China