Practices and Study on Coal Mining in Shallow Depth Seam Passing Through River Bed

In order to prevent the surface water rushed into the mine through the water flow fissure zone during the seam mining operation to threaten the mine saf ety, based on the hydrological investigation conducted on the watery zone of Xinmingou Area for No.1201 coal mining face in Ningtiaota Mine of Shenfu Mining Area, th e calculation with the experience formula showed that after the mining of the coal mining face, the river section of the surface ground above the coal mining face would be formed as a subsidence area. After the subsidence occurred, the height of the water flow cracking zone would be about 60 m and the water flow from the surface gro und to the coal mining face would be connected.The SF6 gas experiment showed that the water drainage sump set in the underground mine, the water drainage pipelin e set on the surface ground, the excavation and backfill of the river course and other comprehensive technology could be applied to prevent the surface ground water ru nning into the underground mine.The results showed that during the mining process, the water inrush value in the coal mining face was 4.7 m3/h higher than the previo us coal mining face.Thus a safety mining in the shallow depth seam was conducted passing through the river bed.