MINING UNDER SAFE WATER PRESSURE OF AQUIFER IN 750 LEVEL DIP OF DONGSHAN COAL MINE

After introducing the geological,hydrogeological and mining conditions,this paper discusses the condition of mining under safy water pressure of aquifer in No.15 coal seam of Dongshan mining area and change regularity of thickness of impermeable floor,divides the area of mining under safy water pressure into three divisions,and advances the proposals.