Formation And Evolution Characteristics Of Groundwater In Xinji No.1 Coal Mine

The hydrogeological conditions of the Xinji No.1 Coal Mine are complex.There have been 39 sudden?out?water accidents in the mine production process.Water damage is one of the important hidden dangers affecting mine safety.The mine is mainly affected by coal-bed roof sandstone water,nappe aquifer water,limestone karst water and old air water damage.This paper takes Xinji No.1 Mine as the research object,and systematically collects the geological and hydrogeological data of the mine.According to the main water-filled aquifer of the mine,the coalbed roof sandstone water,the nappe aquifer water and the limestone karst water groundwater sample conventional ion(K⁺+Na⁺,Ca²⁺,Mg²⁺,CO₃^2-,HCO₃^-,Cl^-,SO₄^2-),TDS,pH values,etc.,using Piper three-line graph analysis and principal component analysis to study the formation of groundwater hydrochemistry in the mining area.evolutionary features.The main conclusions are as follows:?1?Affected by mining activities,the groundwater of the three aquifers in the mine is alkaline,and the relationship of cation content is K⁺+Na⁺>Ca²⁺>Mg²⁺,and the relationship of anion content is Cl^->HCO₃^->SO₄^2-,the coefficient of variation ofconventional ions in water samples is generally greater than 0.5;?2?Affected by mining activities,The main water chemical types of coal-based water is type Cl-Na,andCl-Na·Mg;The Archaean era limestone aquifer is type Cl·HCO₃-Na,HCO₃-Ca and Cl·HCO₃-Ca;the water chemistry type of the napped aquifer water is mainly Cl-Na type;?3?By the ratio of different ions of ion combination ratio and the characteristic value extraction of factor analysis,the dissolution and cation adsorption interaction of K⁺and Na⁺formed in coal-series water,too gray water and nappe water in Xinji No.1Mine were determined,Ca²⁺and Mg²⁺are mainly derived from the dissolution of carbonates and sulfates.The formation of SO₄^2-and HCO₃^-not only the dissolution of sulfates and carbonates but also the desulfurization;?4?Affected by mining activities,the coal-based water shows obvious"hardening"effect and"desulfurization"characteristics due to the influence of mining activities;The Archaean era limestone aquifer has obvious"softening"The trend,along with the"desulfurization"effect of the water supply of the grey water and the clips,is partially affected;the alternating action of the water cation adsorption of the nappe is obvious,and the water sample shows the"hardening"characteristic.Since the three aquifer water samples show a good positive correlation with Na⁺and Cl^-,the"salting"effect is obvious and runs through the entire evolution process.The paper discusses the formation mechanism and evolution characteristics of groundwater hydrochemistry in Xinji No.1 Mine by traditional water chemistry method,which provides a reference for mine water disaster prediction and prevention and water resources utilization.Figure[25]table[12]reference[67]...