Abstract: A coal mine in Shanxi Province is affected by the accumulation of water in the goaf of 15101 working face when the excavation 15102 is transported to 375 m.The roof of the roadway showed a large amount of water,which is leaked through the cracks of the K2 limestone and anchor rope and bolt.The amount of water in the roof of the roadway heading is nearly 30 m³/h,and the mining succession is seriously affected.According to the experience of water damage prevention and research analysis,a technical scheme of segmented grouting reinforcement is developed.The 15102 transport slot pass—through 375~660 m section and 720~1 705 m section are used for grouting reinforcement with sulphoaluminate cement composite;for the 660~720 m section,roof rock stratum tectonic development,three—dimensional sealing and reinforcement is done by using advanced chemical slurry.The practice show that the scheme can effectively prevent the roof from dripping water while improving the safety factor of the construction of working face,besides that,the threat of goaf water—rich area to working face can be avoided effectively.

Key words: Grouting reinforcement, Roof watering, Structural development, Water damage prevention