GIS-based Groundwater Chemistry Characteristics Analysis And Quickly Discriminating Forwater-inrush Source In Dingji Coalmine

Coamine water disaster is one of the major disasters which restrictits safe production,so exactly and quickly discriminating the source of water-inrush is the basis ofpreventing and governing water-inrush effectively.This paper chooses Dingjicoalmine in Huainan as the research area,defined the aquifers′water chemicaltypes, regularities of distribution and the characteristic ions by collecting andanalyzing the related data of Dingji’s prevention and management of water.Andthree models for water-inrush source discrimination were used to discriminate Dingjicoalmine′s water samples, and achieved good results. Finally the discriminationmodel of water-inrush source was integrated into the the system for quicklydiscriminating water-inrush source in Dingji coalmine.The main conclusions and results of this paper are as follows:(1)The main filling-water aquifers in Dingji coalmine are Cenozoic bottom aquiferand coal measure aquifer. The main water-types of Cenozoic bottom aquifer areCl-K+Na and Cl·SO4-K+Na; The main water-types of coal aquifer are Cl-K+Na andHCO3·Cl-K+Na.The concentration of SO42-in bottom aquiferis gradually increasedfrom the middle to east and west, and the water-type is transforms from Cl-K+Na toHCO3·Cl-K+Na.The concentration of HCO3-in coal measure aquiferis graduallyincreased from the east to west,and the water-type is transforms from Cl-K+Na toHCO3·Cl-K+Na.(2) The ion of Ca2+,Mg2+,HCO3-and SO42-can be used as the characteristic ions todistinguish the Cenozoic bottom aquifer and the coal measure aquifer,and thedistinguish rate are66.67%,75%,70.83%and62.50%.(3) The discrimination accuracy of Bayes stepwise siscrimination method, fuzzycomprehensive method and degree of grey incidence method are93.47%,86.96%and86.96%respectively.(4) By using C/S mode and C#language, a GIS-based quickly discriminating systemfor water-inrush source in Dingji coalmine was developed,realizing the basic function ofGIS and other functions such as management of the spatial data and attributing datawhich related to water prevention and control information,discriminating of minewater-inrush source, and having a high application value.