Research On Hydrogeological Characteristics And Mine Water Inflow Forecasting For Cao Zhushan Iron Ore

Iron ore,as an important raw material for Industry in China,has been in increasing demand in recent years.With the continuous increase of mining depth and the continuous expansion of mining scale,safety accidents caused by mine water inrush and inrush occur from time to time.It has brought serious casualties and economic losses to mines and surrounding areas.Therefore,it is of great practical and economic significance to carry out detailed hydrogeological survey and hydraulic connection analysis in mining area and its surrounding areas for the prevention of underground water hazards.This paper takes Caozhushan Iron Mine in Cangshan County of Linyi City as the research object.The hydraulic characteristics of groundwater recharge,runoff and drainage in overlying strata of ore bodies are obtained based on the analysis of geological data and laboratory and field tests,the characteristics of hydraulic connection in mining area are deeply analyzed.Then the water inflow of the deposit is predicted and the corresponding water disaster prevention measures are put forward.The research contents and main conclusions are as follows:1.Atmospheric precipitation is the main source of groundwater recharge in mining areas.Shallow groundwater runoff along the aquifer to the northeast side of the mining area and discharged to the side of Huibaoling Reservoir2.Through the analysis of hydrogeological materials and field drilling results,it can be concluded that:There are three aquifers in Caozhushan Iron Mine.They are shallow Quaternary,quartz sandstone aquifer.intermediate limestone(siltstone)aquifer and ore-bearing country rock(biotite granulite fissure)aquifer.Water content and water supply capacity of aquifer gradually decrease from top to bottom,and water-rich is weak.3.Through field pumping test,tracer test and geophysical analysis,we can know that:The water-filling sources of Caozhongshan iron ore deposit are meteoric water infiltration,fissure recharge water,surrounding rock fissure aquifer and F5 fault water.4.F5 fault and the southeast part of the mining area pass through the orebody,through the aquifer and orebody,and the water conductivity is poor in the stable state.If disturbed by large artificial mining,the fault zone is likely to become a water diversion channel,threatening the safety of mines and workers.5.The water inflow of the deposit is predicted by the tunnel method and the large well method.The predicted results are as follows:Tunnel method:At 120 m level,the normal water inflow of tunnel is 1556 m~3/d,and the maximum water inflow is 2646 m~3/d;At 420m level,the normal water inflow is 4029 m~3/d and the maximum water inflow is 6849 m~3/d.Big well method:water inflow from elevation to 220m is 3900 m~3/d;water inflow from elevation-320m is 5317m~3/d;water inflow from elevation-420m is 6087m~3/d.