| The 13th Mine of the Ping Dingshan Coal Industry Group Company is now mainly mining seamâ…¡1, the floor of this seam are Cambrian-limestone water-bearing strata and carboniferous-limestone water-bearing strata . In this coal mine, karst cranny is better developed, there is abundant confined water and the hydrogeological condition is very complicated. Since this coal mine was set up, water inrush accident frequently occurred, and with further mining operation the safety of this coal mine will be seriously threatened by water trouble. To ensure safety in mining operation and to take rational and effective measures to solve water trouble in mine coal, the water-inrush mechanism and water inflow were studied through the means of comprehensive analysis of hydrologic geology, analysis of hydrochemistry, analysis of water trouble, analysis of numerical modeling etc.Through data collection, hydrogeological investigation, the analysis of hydrochemistry, etc, the paper makes a comprehensive analysis of geologic conditions,hydro-geological conditions, full-water source of mining, the channel of full water and the mechanism of water inrush, and predicts water inflow in shaft through the use of analogy method in hydrogeology and time sequence model. Based on the aforesaid and also on Visual Modflow, the paper builds an underground-water simulation model which is in conformity with actual hydro-geological condition and is feasible, and by the way of modeling, predicts groundwater reservoir distribution and water inflow under future mining. It is revealed that the karst water is poor in deep aquifer, its greater impact on mine drainage.The mine normal and maximum water inflows are 586m3/h and 1172m3/h which provides data reference for future design of drainage and solving of groundwater problems in coal mine.
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