Evaluation and Study on the Water Drainage Effect of Roof in the 232201 Working Face of Meihuajing Coal Mine
Aiming at the problem of roof sandstone water hazard faced by the 232201 working face in Meihuajing Coal Mine,a series of water prevention and control works are carried out before the stoping of the working face.By exploring the roof aquifer and carrying out water drainage engineering,the amount of water drained from the boreholes is observed.After the completion of the water drainage project,the attenuation rate and stable situation of the water volume in the drilling site are analyzed,and the effect of roof water drainage is evaluated combined with the static reserves of working face water inflow and predicted value of dynamic supply quantity.The results show that from the perspective of water volume changes in boreholes and drilling sites,the attenuation rate of most boreholes reaches 100%,and the water volume tends to stabilize.The water drainage volume of the roof water drainage drilling holes is greater than the static reserves,and the water drainage effect is good.By combining the predicted water inflow of the working face using the large well method with the actual observation data of drilling hole water drainage,the water drainage effect of the sandstone aquifer at the top of the coal seam is evaluated.This method is suitable for evaluating the hydrogeological conditions of similar working faces before mining,and provides important practical guidance for water hazard prevention and control and water resource management in mines.