Evaluation of Drainage Effect of Roof Sandstone Aquifer of Coal Seam

ZHAO Baofeng

doi:10.3969/j.issn.1008-4495.2013.06.012

Abstract：In order to scientifically evaluate the drainage effect of roof sandstone aquifer of coal seams, a prediction method combining the static reserves amount with the dynamic supply amount was adopted for the prediction of water inrush in the working face, the analysis on the total drainage amount from the borehole and the residual water amount indicated that when the total drainage amount from the borehole was greater than the static reserves amount in the aquifer and the residual water amount in the borehole was equal to or less than the dynamic supply amount, the drainage effect of the roof sandstone aquifer was good. The case analysis showed that the prediction method combining the static reserves amount with the dynamic supply amount was tallied with the actual situation. When the total drainage amount from the borehole was greater than the static reserves amount in aquifer and the residual water in the borehole was less than the dynamic supply amount, the safe mining of the working face can be realized. The method by combining the prediction of water inrush in the working face with the observation data of borehole drainage was scientific and reasonable for evaluating the drainage effect of the roof sandstone aquifer of coal seams, and can be applied in safety evaluation of the hydrogeological conditions of similar working faces before mining.