| The influence of coal mined for underground water is a dynamic and continuous process.It broke intrinsic state for supply,flow and drain.The underground water system became more and more complex.Emptiness of different depth and size were formed.Rock stratum of empty top tray successively inbreak,subside and appear fracture fissure,take shape diversion fissure zone,cause water of top aquifer shift to lower,lead to swallet,safety production was effected.Therefore,it is significant to deeply analysize hydrogeology condition,to forecast swallet for preventing malignance accident like preventing water inrush and flood well,reducing production cost and guaranteeing mine safety.Choose No.2 mining area of Dong Huantuo in Kai Luan for study area.Collected by the numbersgeological and hydrological data through mine explore and production explore.Hydrogeology condition of 5thcoal mining in No.2 mine area were roundly analysizedcombined field investigation.By means of comprehensively studying pumpingtest data,lithology and thickness of drill,water level,water inflow,geological structure,minedestroy,grasped rules like supply and boundary conditions,heterogeneous distribution,transmissibility of 0~100m aquifer 5th coal mining roof,diversion fissure zone of 8th coal mining.Established underground waternumerical model of major roof aquifer,simulated steady flow by long-term flow,acquired initial water level and stream before mining.Realized drain away water by mine face with method of pumping well were replacedby drainage ditch,simulated variation of water level in unsteady flow during the period of mining.According toobservation data from DG27 and DG39 of 5th coal mine roof,fitted and checked the model,obtained change over time fitted curve of the two observations and osmotic coefficientpartition of simulation area.By model of fitted and checked,simulated and predicted mine face water inflow of 5th coal mine.The result indicated 0~100m aquifer of 5th coal mine roof was main full water aquifer of mining 5th and 8th coal mine,units-inflow was 0.016~1.507l/sm,osmotic coefficient was 0.369~10.492m/d,crack were very much,watery was very strong,and unevenness.Accept supply from alluvium,the water level and water inflow were effect by construction.Structural fracture leaded to heterogeneity of osmotic coefficient,format six partitions.DG27 and DG39 were better fitted through adjusting parameter.The simulated result showed that forecasting maximum water inflow was 5852.97m3/d,minimum water inflow was 1352.1 m3/d of 5th coal mine. |
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