Technology Practice of Mining over Floor Limestone with Pressurized Water

For occurrence of confined water in floor limestone of 6 Coal Seam in Hengyuan Mine,this paper put forward applying additional geological exploration,optimization design for mining section and mining face,face exploration and test,local reinforcement with grunting into floor,pressure-relief by dewatering,changing floor aquifer by grunting from surface station to forming a set of water prevention methods including exploration,prediction,underground geophysical prospecting,evaluation,measure,inspection,monitoring and prevention.The application of these methods has eliminated effectively floor flood.