Main Aquifer Hydrogeology Characteristics And Evaluation On Safety Mining Lower-Group Coal Layers In The Eastern Xiezhuang Minefield

Floor water-inrush is main incipient fault that threat the deep coal layers(the deep coal layers of taiyuan group) safely mining about taishan energy Co. Ltdxiezhuang coal mines. Along with increasing of mining depth, hydraulic is high,the probability of floor water-inrush is more great. Bases on the water-leverdata of observation hole, the geophysical exploitation data, drilling data andpumping test data collection, associating the feature of regional terrain andlandform, stratum structure and geologic structure, the distribution of groundwater aquifer, the water-rich character, the recharge channels, flow off anddischarge, the characteristic of water chemical composition are analyzed in eastof mining area. Bases on the characteristic of aquifer lithological and thicknessvariation, the characteristic of groundwater storage in each aquifer is concluded.On the basis of analysis on hydrogeologic characteristics of xujiazhuanglimestone and Ordovician limestone, the hydrogeological condition of xujiazhuanglimestone and Ordovician limestone are generalized. According to available dataof level fluctuation of xujiazhuang limestone and Ordovician limestone,trial-and-error method is used to determine each portioned-parametric. UsingGroundwater Modeling System (GMS) software, underground seepage ofXujiazhuang-limestone and Ordovician limestone are simulated, dynamicalcharacteristic of ground water and the change law are analyzed, and the trendof water level in the future 1 year is forecasted By analyzing lithologicassociation and Thickness Variation of auifuge between Xujiazhuang limestone,Ordovician limestone and the lowest coal seam, a comprehensive evaluation of theblock-water performance is given. Considering aquifer water abundance,water-lever, hydraulic factors, using water bursting method, the danger zonesof water inrush from floor are classified, the possibility of water inrush fromfloor in each zone and the quantity of hydrophobic is predicted. When the dangerzones of water inrush from floor is drained and decreased pressure, Finally, thetechnical approaches about the preventing and treating water inrush from floor of Xu.jiazhuang-limestone and Ordovieian limestone are put forward.