Water hazard prevention technology and effect evaluation on the working face roof of Nalinhe No.2 Coal Mine

The coal mines in the Dongsheng coalfield are generally threatened by roof sandstone water, which affects the safety of mine production. Taking the 31105 working face of Nalinhe No. 2 Coal Mine as an example, a set of effective roof sandstone water exploration and treatment methods is provided. Sedimentary facies analysis and underground geophysical prospecting were used to explore the water-rich anomaly area of roof sandstone, and the key exploration areas were delineated, and the key exploration areas were explored and dredged through the construction of roof drainage water boreholes. At the same time, the drainage effect of roof sandstone water is tested by the water inflow of a single hole and the water pressure of the borehole, which ensures the safe mining of the working face.