Study On The Evolution Of Groundwater Flow Field In Concentrated Coal Mining Area Of Changzhi Basin

High intensity of coal development resulted in the variation of aquifer structure in the mining area,especially in the groundwater level.Direct cause of coal mining area near wells dried up rivers,frequent water inrush accidents,people's lives and property safety is a great threat.Therefore,it is very important and profound significance to study the dynamic characteristics of groundwater flow field under mining conditions,and to understand the objective law of groundwater circulation.In this paper,through the full collection of geological data and previous studies of the experimental data,the use of hydrological geology method from the aquifer structure variation analysis.On this basis,the indoor simulation test of similar materials for underground water mining condition of Yushe mining area a working surface field simulation;through computer simulation experiment to simulate the whole study area in water circulation dynamic conditions.This will provide a scientific basis for the prevention of water inrush accidents of mining enterprises,reduce the loss of lives and property;at the same time also have a clear understanding of how to change,the groundwater flow field after mining of groundwater resources to re distribution,provide technical support for the prevention and treatment of late.(1)Based on the comprehensive analysis of geological data in the study area,previous research and experimental data,the structural variation of aquifer under the condition of coal mining was analyzed comprehensively.The results show that the mining development dynamic collapse,fault and fracture under the influence of rock accords with Qian Minggao [1-2] proposed the "three zones" theory,and to determine the structure of aquifer thickness is about 96 m.(2)Through the use of indoor simulation test of similar materials,with two kinds of mining scheme(scheme 1: vertical flow direction mining,scheme two: consistent with the direction of flow mining)Comparative Study of changes of groundwater flow,determine the radius and the drawdown and linear distance relationship,and linear under certain conditions the scope of the fitting equation.Finally determine the scheme of a maximum influence radius of 1040 m,scheme two,the maximum influence radius of 532 m,comprehensive analysis and the direction of the water flow to maintain a consistent pattern of mining the best.(3)Through the computer simulation experiment,the change of groundwater flow field and the water cycle situation of the coal mining area in Changzhi basin are simulated by using MODFLOW software.The results show that there is a significant change in the groundwater flow after mining,and the whole area is flowing to the coal mining area.