Abstract：The mining of No.50601 face in Tianan Mine was threatened by the water of upper Majiagou Formation limestone karst confined aquifer on the floor. In order to realize the safe mining of the working face, the geological and hydrogeological conditions of No.50601 face were analyzed. 83 drilling holes were arranged in the return air roadway and the belt roadway to carry out grouting reinforcement within 15 m of the top of the upper Majiagou Formation limestone aquifer. The sum of water volume of all drilling holes was 642 m3/h, and a total of 875.3 t of cement was injected. Finally, the safe mining of the working face was realized, which provided experience for the prevention and control of confined aquifer water in coal seam floor.
