The application of “three maps-two predictions” method based on GIS

To evaluate mine roof water inrush in coal seam No.1 in Daqiang mine of Tiefa Coal Group, the AHP-type "three maps-two predictions" method based on GIS is employed. Through comprehensive analysis of 5 geologic factors such as the thickness of aquifers, total core recovery, volumetric flow rate, permeability coefficient and faults which influence the water abundance of the roof of coal seam No.1 in Daqiang mine, the water-richness distribution maps of aquifers in coal roof were obtained, and the research on safety division of the breaking zone was conducted. The final comprehensive division program on water bursting conditions of coal seam No.1 in Daqiang mine was presented through overlapping of multiple source geo-information on the basis of the above studies. Finally, water bursting inflow of mining faces 2-202 and the 3rd mining area was predicted by utilizing advanced professional software Visual Modflow.