| Water disaster is one of the major coal mine disaster, not only affect the normal lifethreatening further industrial production, where the bottom water bursting is the main component of coal mine water damage. Numerical method for the study of objective things is prevalent in various disciplines and fields. Studying the movement of groundwater has been a hot spot on the hydrogeological numerical method. Water disaster-hit area of Fengfeng No.5 Coal Mine east area will be selected to be the research object which is a certain sense for exploration of drainage and decreasing pressure and production safety and provides reference for similar regions.This paper through a study for the measured data of east area of Fengfeng No.5 Coal Mine,relying on dewatering test measured data on east area of Fengfeng No.5 Coal Mine Daqing limestone to do the analysis,induction and generalization for geology and hydrogeology situation of aquifer- Daqing limestone and establish a similar mathematical model.Base on the mathematical model and a quotation from the world's advanced Visual Modflow and GMS groundwater numerical simulation software to carry out numerical simulation.According to the relationship between the confined aquifer water level and pressure and using water inrush coefficient method to evaluate the water inrush coefficient of No.5 Coal and No.6 Coal. On this basis, using the numerical model has been established and under the conditions of No.5 Coal and No.6 Coal production safety to predict the water needed drainage for Daqing limestone aquifer.The research gets some recognitions: 1) For eastern Daqing limestone aquifer,horizontal permeability coefficient is 516 m/d and vertical is one tenth of that. The value of water storage coefficient is 1.0×10-54.0×10-5 and the flow is 4×10-44×10-6. 2)The water level of the region decreased 20 m through the drain and the water level reached equilibrium in 1224 hours.Water level rapid recovery by closing discharge water wells indicating that Daqing limestone aquifer water is rich and easily dewater and buck. 3)The water inrush coefficient of No.5 Coal and No.6 Coal respectively is 0.0510.094 and 0.1020.499.If preventive measures are not taken,eastern group 5 # 6 # coal mining are subject to greater risk of water damage. 4)Daqing limestone aquifer through the appropriate amount of water distribution can reduce the water level of the aquifer and the water pressure on the roof.In summary, after carrying out the numerical simulationthe of aquifer drainage in study area and puting water predictive analysis based on numerical method study means,measured drainage data of wells and Visual Modflow, GMS groundwater numerical simulation software,consider that dewatering and bucking can effectively reduce No.5 Coal and No.6 Coal risks of floor groundwater bursting in this region. |
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