The condition of water gushing from floor of No.15 coal seam in Dongshan Coal Mine

Dongshan Coalfield is located in the western part of Niangziguan Spring Area.Ordovician karst water threatens mining No.15 coal seam safely.The possibility of karst water gushing is existed in weakness zone of water-resisting coal block and fractured zone of collapse-columns.This paper deals mainly with the condition of water gushing from coal seam floor and advances the control measure.