Affiliation: | 1.National Engineering Research Center of Coal Mine Water Hazard Control, China University of Mining and Technology, Beijing, 100083, China ;2.Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing, 101601, Yanjiao, China ;3.The 4th Geological Team of Hebei Geology and Mining Bureau, Chengde, 067000, China ;4.Northwest Nonferrous Survey Engineering Co. Ltd., Xi’an, 710054, China ; |