Research On The Groundwater Runoff Characteristics And Recharge Water Source Of The No.3 Limestone Aquifer In Longgu Coal Mine

Longgu coal mine is an oversize modern mine in juye mining area,mainly mining shanxi group No.3 coal seam.The direct discharge aquifers that affect mine safety is 3 coal seam roof and floor sandrock aquifer and No.3 limestone aquifer of taiyuan formation,which has the characteristics of large buried depth(over 800m)and high water pressure(over 8MPa).Since the establishment of the coal mine,the mine water inflow has been maintained at more than 1200m3/h,with the maximum reaching 1600m3/h.Water inflow of the No.3 limestone aquifer account for more than 50%of the total water inflow of the mine,which has a great impact on the mine production.This paper systematically analyzes the mine hydrogeological conditions and the characteristics of mine water inrush in more than ten years.The hydrogeological characteristics of the No.3 limestone aquifer and the water control discipline of the mine structure are summarizcd.The hydrological unit division of the No.3 limestone aquifer and the supply source and channel of No.3 limestone aquifer groundwater is analyzed.These studies serve as the basis for mine water disaster control.Based on the principles and methods of mine geology and hydrogeology,this paper analyzes the development rules of mine structure in detail,studies the water-control characteristics of geological structure,and divides the No.3 limestone aquifer into hydrogeological zones.This paper analyzes the drainage data of No.3 limestone aquifer for more than ten years,establishes the seepage field model of No.3 limestone aquifer groundwater with GMS software,and systematically studies the characteristics and changes of groundwater runoff in No.3 limestone aquifer over the years,and analyzes the effect of-810m level shaft station water inrush on the whole mine No.3 limestone aquifer groundwater.Founded on the principle and method of hydrochemistry,the discrimination model of recharge water source of No.3limestone aquifer was established.By analyzing the change of ion content in No.3 limestone aquifer water samples,the replenishment source and the channel of No.3 limestone aquifer groundwater were studied.Finally,the measures of reducing water inflow in-810m level shaft station is put forward.