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Abstract The water conducting channel formed by geological structure was always one of the causes of water disaster accidents in coal mines, and its manifestations were different. Among them, due to the influence of mining, the original non-water-conducting structure was transformed into the water-conducting structure, which formed lagging water outflow. Because of its certain concealment and suddenness, it is particularly harmful to mine production. In order to ensure the safe production of coal mine, the large drop fault should be explored and reinforced in advance when it was near the working face of coal mine and reduced the thickness of effective aquifuge. This paper took the advance reinforcement control project of non-water-conducting fault with large drop near No.2225 Face of Dongpang Mine as an example, and put forward specific prevention and control countermeasures for lagging water outflow.
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