Using Coal Mine Water Inrush to Calculate Hydrogeological Parameters

In order to accurately analyze the reason of coal mine water inrush and study on coal mine hydrological condition, this paper takes coal mine water inrush as an aquifer dewatering test. Integrating hydrogeological drill, hydrogeological prospecting, hydrological monitoring system, etc. the paper provides an original groundwater seepage field recovery technique. And this technique was successfully applied to recover the original seepage field of the weathered Zhiluo Group roof aquifer of the 2(-2) coal seam of the south panel of Ningtiaota coal mine. Based on the water inrush data collected by the hydrogeological monitoring system, this paper did an inverse calculation of the parameters of the aquifer. The permeability coefficients calculated from pumping test are 2.13m/d and 2.15m/d, while the coefficient from inverse calculation is 6.88m/d. The influence radiuses calculated from pumping test are 106m and 89m, while the influence radius from inverse calculation is 1941m. The results shows that the hydrogeological parameters calculated from water inrush inverse calculation are apparently bigger and more accurate compared to the parameters calculated from pumping test.