Prediction Methods of Water Inflow in Coal Face Based on Comparison of Water-filled Conditions

In view of the complex hydrogeological conditions and the difficulty in the arrangement of drainage and prevention systems in Nalinhe No. 2 mine in the bordering area of Inner Mongolia and Shanxi Province, the method for predicting the water inflow in the working face is studied. Based on the deep analysis and research on the water-filled source, water-filled channel and water-filled strength of 31121 working face of the mine, the dynamic prediction of water-filled amount of the working face is carried out by using big well method, single wide flow method and hydrogeological comprehensive comparison method respectively, and a comparative study is carried out on the methods and predicted results. The results show that the water inflow prediction results based on hydrogeological comprehensive comparison method are most accurate, which can be used as the basis for the construction of the water drainage systems in the coal faces to ensure the coal safety recovery.