Hydrochemical Characteristics Of Karst Water And Identification Of Water Inrush Source In Linhuan Mining Area

Water inrush is one of the common disasters that restricts the safe and sustainable production of coal mines.It also poses a threat to the safe production of mines and also threatens the life safety of workers.Therefore,the rapid and accurate identification of mine water inrush has important practical significance for mine prevention and control work and water hazard prevention..In this paper,taking the Linhuan mining area as the research object,on the basis of the collection,collation and analysis of the geological and hydrogeological data of the mining area,the water chemistry conventional ions,TDS,and pH of the aquifer samples were analyzed,and thehydrochemical characteristics of karst water in the mining area was studied.A variety of discriminative models of limestone water inrush in mining areas have been established.The main results are as follows:?1?The analysis of K⁺+Na⁺,Ca²⁺,Mg²⁺,Cl^-,SO₄^2-,HCO₃^-,TDS and burial depth of limestone led to that as the depth of burial increases,the contents of K⁺+Na⁺,Ca²⁺,Mg²⁺,Cl^-,SO₄^2-and TDS increase,while the content of HCO₃^-decreases.?2?Using the piper three-line map to analyze the conventional ion contents of K⁺+Na⁺,Ca²⁺,Mg²⁺,Cl^-,SO₄^2-,HCO₃^-and other aquifers in the mining area,and obtain the water quality types of each aquifer:The fourth aquifer is type Na-Cl and Ca·Mg-Cl·SO₄;Stratum sandstone aquifer in coal-bearing strata is type Na-HCO₃ and Na-Cl;The Archaean era limestone aquifer is type Ca·Mg-SO₄ and Na-Cl;Aquifer in Ordovician limestoneis Ca·Mg-SO₄ type and Ca·Mg-Cl·SO₄ type.The limestone karst fissure water in the mining area has hydraulic relations with the four water-bearing and coal-bearing sandstone fissure waters to a certain extent.?3?Factor analysis is used to extract eigenvalues to clarify the main hydrochemical formation in the process of groundwater chemical evolution.?4?Using K⁺+Na⁺,Ca²⁺,Mg²⁺,Cl^-,SO₄^2-,HCO₃^-,and TDS as research indicators,three models of Fisher,fuzzy comprehensive evaluation,and BP were established in the study area.Comparison of the three models shows that:BP neural network has better discrimination effect.