GIS-Based Groundwater Environmental Characteristics Analysis And Discriminating Model Of Water-inrush Source-A Case Study Of The Panyi Coalfield, Huainan Coal Mine Corporation

Discriminating the source of coal mine water-inrush quickly and correctlly is the precondition of water control. Goegaphy information system is a database management system with functions of spatial data collection, storage, retrieval, analysis and visualization.The flow of underground water systems and chemical field are characterized with spatiality, so it has theoretical and practical significance to apply GIS to analysis the groundwater environment, to reasearch the groundwater evolution and to discriminate the water-inrush source with the perspective of space.After referring to lots of relative literature about the coalmine groundwater prevention and remedy, this article chooses the Panyi coalfield in Huainan as the research area, adopts the methods combined the theoretical analyzing and case study, collects and analyses the hydro-geological, hydro-geochemical and water chemical Information of the past years.Using MapGIS as the major research tools and platforms, combined with methods like multiple statistical analysis, water chemical analysis and isotope analysis,this dissertation studied the groundwater level dynamics and flow characteristics of Panyi Mine, and aslo reasearched the spatial distribution of water chemisty including the evolution law Along both horizontal and vertical plane , as well as the correlation between indicators,still typical indicators with more ability of identification were selected. Fuzzy Comprehensive method (FC), Degree of Grey Incidence method (DGI), and Bayes Stepwise Discrimination method (BSD) were disscussed .and the extension identification method (EI) was applied to the modeling of mine water-bursting source discrimination of Panyi Mine. The final results shows:(1) The groundwater level dynamics in the Cenozoic aquifers and limestone of Panyi Mine are coherent with that of precipitation. The water level funnel of the 4th Cenozoic aquifer locates at the northern mining area near the 7th exploration line. The sandstone aquifers are partly recharged by the 4th Cenozoic aquifer.The recharge area elevation and the sealing degree of the aquifers are different.(2) The groundwater in the 4th Cenozoic is sigle type of Cl-Na+K; along the direction of deviating the seam outcrop, Water-types in the sandstone aquifers changed gradually from Cl-Na+K to Cl-HCO₃-Na+K, water chemistry indicators change regularly correlatively. Water-types in the limestone aquifers are Cl-SO₄-Na+K, Cl -Na+K,Cl-HCO₃-Na+K; Water-types of the groundwater in mined areas are Cl-Na+K,Cl-HCO₃-Na+K,HCO₃-Cl-Na+k,which are caused by the different water-types of their recharge water.(3) Along the downward direction of the sandstone aquifer, concentration of Ca²⁺,Mg²⁺,total hardness,temporary hardness,SO₄^2- decrease and that of TDS,HCO₃-,K⁺+Na⁺,negative hardness,pH increased.Ca²⁺,Mg²⁺,SO4^2- and hardness are selected as typical indicators for identifying the water-inrush source because of their relatively stable development and larger concentration difference among aquifers. The selected indicators are the same with those selected through statistics method.FC method, DGI method, and BSD method still can be improved, comparing the EI method with them, the result shows: the retrospective discrimination accuracy of FC, DGI, BSD ,and EI are 95.8%,85.4%, 66.7% and 89.6%. The discrimination accuracy are all 83.3%.