Study On Characteristics Of Hydrogeology In Yimin Hedong Coalfield

Given the fact that it lacks of hydrogeological condition research in Yimin Hedongcoal, for instance, dividing aquifer and water-resisting layer with its spatial distributioncharacteristics, the groundwater runoff, dynamic characteristics of groundwater, theconnection between the aquifer, water-richness of aquifers, the basic hydrogeologyresearch of coal is forward looking. Guided by the theories of hydrogeology,sedimentology, and combined with regional geological data, the research of aquifer andwater-resisting layers division with its spatial distribution characteristics,hydrogeological feature and sedimentary facies of the black of Yimin Hedong coalthrough pumping test, hydrogeological characteristics and sedimentary analysis, and themine inflow is predicted.The spatial distribution pattern of the aquifer and water-resisting layer of YiminHedong coal is ascertained. The study shows that on the longitudinal the first andsecond of the bottom of Yimin grounp have general aquifer thickness and16-3coalseam have large water-resisting layer between its roof and floor. In contrast, the thirdand fourth of the top of Yimin grounp have large thickness and wide area and15-5coalseam have large aquifer.Horizotally, the northwest of aquifers have large thickness, thethinner the closer to the southeast. And the interval water-resisting layers increase.The size and discharge conditions of groundwater mastered is that it get supplyfrom southeast, southwest and migrates from south to north, along the strike of the strata.Meawhile, the analysised characteristics of groundwater flow field shows that theaquifers between15coal seam and16coal seam direct from southeast to the northwest,however, the aquifers of the roof of16coal seams direct from southwest to northeast.Moreover, the grounp of hole pumping test is adopted to define the hydrogeologyparameters. Then, by using the method of groundwater dynamic characteristics andwater quality analysis, it revealed that between15-16and16coal seam aquifers haveclosed connection.On the basis of the research of sedimentary facies, the rich water area is determined.The coalfield is divided into sections abounding with groundwater mostly,partially andrarely. Because the area of the northwest and southwest of fluvial facies braided river delta system is strong water-richness, it is devided into strong rich water. The braidedriver delta in central plain phase has less water content, which results from distributarychannel sand body size is fine and vertically superimposed, so it is devided into mediumrich water. Southeast of delta and shallow lake facies that is argillaceous sedimentaryand poor water-richness is divided into weak rich water.Mine water inflow is calculated through the big well, long and narrow roadway and3D seepage numerical simulation. Compared three kinds of method to calculate resultswith actual situation, and recommend big well method for this mine inflow. Calculationresult is:15-16coal seam aquifers of the normal mine water inflow is4890m3/h. Whileresults of16coal seam aquifers is2750m3/h.The two aquifers have big water inflow,which is considered as important research object for isolating water and preventing andcontrolling water disasters.