THE RESOURCES AND CONTROL OF ORDOVICIAN KARST WATER BURSTING IN XUZHOU COAL MINING AREA

In Xuzhou Coal Mining Area the groundwater hazard is serious due to the larger mining depth and complicated hydrogeological conditions.The causes of water bursting,which source is Ordovician(O) aquifer,are as follows:hidden collapse column in coal seam floor or the fault is transmissible for groundwater;the floor(roof) aquifer connects to O aquifer,fracture zone of coal seam roof conducts with O aquifte that is located in opposite side of the fault;O groundwater recharges the mine through buried outcrop of bedrock laterally.The measures of groundwater hazard control are as follows:the development regularity of O karst water should be explored by advance technique;mining by areas and perfecting drainage system;plugging water bursting points with grouting;combining drainage with water supply and synthetically utilizing water resources.