Abstract:Based on the Chezy rule,which can describe crack water flow of bedrock,the mathematical model of confined aquifer is set up;and the formulae of water flow and water inrush according to Lagrangian method and Bernoulli energy equation are deduced. Calculating results indicate that the error of computed water inrush and actual in-situ water inrush is only 1.04%. Aiming at the situation of water from flooding to floor of coal seam at a majority of coal mines in Jiaozuo mining area,the method of reinforcement of floor aquifer by grouting to prevent water inrush disasters is put forward. The grouting holes are mainly arranged according to developing extent of fractures and its directions on the strike;and the spaces between grouting holes are determined by diffusing radius of grouting. Grouting parameters such as grouting pressure and grouting quantity are also analyzed;and high pressure water-stopping device is manufactured,which can solve the problem of water-stopping in advancing flow at grouting hole.