关键词: 侏罗纪, 顶板砂岩含水层, 水害区域治理, 长距离定向钻孔, 可控疏放

Abstract: Mining deep Jurassic coal seams in the Ordos Coalfield are seriously threatened by overlying sandstone fissure confined aquifers of Yanan Formation and Zhiluo Formation. During roadway excavation and working face mining of Jurassic coal seams in many mines, the water inrush accidents happened, these seriously influenced the safe production of mines. Took the Jurassic 3-1 coal seam mining in the 302 area of the Muduchaideng Coal Mine as research background, and based on the full analysis of the geological and hydrogeological conditions of the mine, combined with the application situation of the long-distance directional drilling technology for gas control and water prevention and control in coal mines in China, we put forward the technology of regional control for roof thick sandstone aquifer, whose cores are using boreholes in outer roadways of working face for diversion, using boreholes in adjacent working face for closure, using double side goafs for closure and using long distance directional drilling to trace and release water. The application results show: the technology is economical and feasible, during the roadway excavation of the working face, it has less impact on the roadway excavation construction; it can realize the “regionalization prevention and control, separating coal and water separation, diverting clean water and turbid water, regional treatment” for the roof water of the coal mining face; the water hazard of the water-rich roof sandstone aquifer is well solved, under the condition of the water inflow from single roof water discharge hole more than 200 m3/h and the water inflow of the working face more than 600 m3/h, the safe production and an average recovery efficiency of over 12 000 t/d were realized in the full mining thick coal seam. The technology of regional control for roof thick sandstone aquifer explored a feasible treatment method of regional control for thick roof sandstone aquifer in Jurassic coal seam in Ordos Coalfield, it can provide a guarantee for mine safety, high efficiency and green mining.