A GIS-Based Hydrogeochemical Characteristic Analysis And Discriminating Model For The Source Of Water-inrush: A Case Study In Kongji Coalmine, Huainan

Discriminantion of the source of the water-inrush is the precondition of the coalmine groundwater remedy,and GIS software could supply the analysis and management flat roof for the discriminant model and hydrogeochemical information database,so this article choose the title:"A GIS-Based hydrogeochemical characteristic analysis and discriminanting model for the source of water-inrush: A case study in Kongji Coalfield, Huainan" for the research,have theory and practical significance.After referring to many relative literature about the coalmine groundwater prevention and remedy,this article choose the Huainan Kongji coalfield as the research area,adopt theoretical analyzing method and case study.After collect the hydrogeological and hydrogeochemical literature of the past years,and ploted the water-level contours of the main aquifers, then analysis their recharge-discharge correlation,Created the hydrogeochemical databases; analysed the TDS distribution characteristics of the main aquifers.then created the discriminant model about the source of the water-inrush which based on the GIS technical;Choose the main six ions as the ingredient and choose the main aquifers as the evaluation classes,then created the fuzzy-comprehensive evaluation model about the source of the water-inrush,then use the existanced sample to check the model.The finally result shows:(1) The Access-based database can assist the discriminating models, and the GIS-based visualized database can make the coalfield's hydrogeochemical information more intuitionistic;(2) The general tendency of the aquifers'water levels is declined because of the mining drainage activities, despite recharged a lot during water abundant period;(3) By the regional drawdown-cones in the east part of Kongji coalmine, part of the Ordovician limestone aquifer'water flux spontaneously discharged to the quicksand aquifer and the Huai river then turned to the the Taiyuan Formation limestone artificially;(4) As the main aquifers of the coalfield have its original recharge-discharge condition and groundwater dynamic condition under coal mining condition,so each aquifer's TDS distribution have its own characteristics.(5) Using the SO₄^2-,Ca²⁺can discriminate the section-I of the Taiyuan Formation limestone aquifer and Ordovician limestone aquifer; and using the Na⁺+K⁺ can discriminate the quicksand aquifer and Ordovician limestone aquifer except the south area of the "West No.2"and "West No.3"mining areas;(6) The fuzzy comprehensive evaluation model for the Source of the Water-inrush based on the general hydrochemical ions have an acceptable accuracy, the combination of the GIS model and mathematic model will gain a satisfactory discrimination result; and the elevation of the accuracy need the further research henceforth.