Study on method of mine water inrush for inverse calculation of hydrogeological parameters

In order to accurately analyze the cause of the mine water inrush occurred and study on the hydrogeological conditions,a mine water inrush accident was Co nsidered as a mine water drainage test. With the comprehensive application of the hydrogeological drilling exploration,geophysical exploration,mine hydrology monitoring a nd measuring system and other means,a recovery technology of the underground water original flow field was provided. The technology was applied to restore the undergr ound water initial flow field status of the aquifer in weathered bedrock aquifer of Zhiluo Formation in overburden strata above No. 2-2seam of Ningtiaota Mine,and the mine water inrush monitoring and measuring data were applied to the inverse calculation on the hydrogeological parameters of the aquifer. With the water pumping tests of the t wo boreholes at the surface ground,the permeability cofficients of the aquifer obtained were 2. 13 and 2. 15 m 1 d individually. With the inverse calculation of the mine wat er inrush,the permeability coefficients of the aquifer obtained was 6.88 m 1 d. The influence radius from the two borehole pumping test was 106 and 89 m individually. The i nfluence radius obtained with the mine water inrush inverse calculation was 1 941 m. The results showed that the hydrogeological parameters from the mien water inrush i nverse calculation would be higher than hydrogeological parameters from the surface ground water pumping test and the data would be more accurate and reliable.