| Taoyuan Coal Mine's hydrogeological conditions are complex,and the threat of water hazards is serious.There are many water hazard accidents.Water hazards are one of the important hidden dangers affecting mine safety.The main sources of water inrush for mine water hazards are too grey water and sandstone fissure water.The main research object of this paper is the Taoyuan Coal Mine.Through the collection of geological and hydrogeological data of the coal mine,according to the main water-filled aquifers of the mine,the fourth aquifer of the Quaternary loose layer,the coal-measure roof sandstone fissure water,and the limestone water of Taiyuan Formation are conventional Ion(K++Na+,Ca2+,Mg2+,CO32-,HCO3-,Cl-,SO42-),TDS,PH value and other data,using methods including Piper three-line graph method,ion combination ratio and principal component analysis to study Taoyuan Coal Mine The characteristics of water chemistry and the reasons for its formation are as follows:(1)Using mathematical statistical correlation methods,the conventional water chemical ions of the main aquifers of Taoyuan Coal Mine were analyzed.The results showed that the relationship between the percentage of cations is K++Na+>Ca2+>Mg2+,and the relationship between the percentage of anions is SO42->HCO3->Cl-,the ions with a coefficient of variation greater than 0.5:four water contains SO42-and CO32-,coal water contains Ca2+and CO32-,and too gray water only has CO32-.(2)Using Piper three-line diagram and corresponding chart analysis method to study the water chemical characteristics of different aquifers in Taoyuan Coal Mine,the results show that the main water chemical type exhibited before the four-aquifer mining is the SO4-Na type,while the main water chemical type after mining The water chemistry type is HCO3-Ca type;the water chemistry type of coal-measure water before mining is mainly SO4-Na type;the main water chemistry type of coal-measure water after mining is HCO3-Na·Ca type;The main hydrochemical types are Cl-Na and SO4-Na,and the main hydrochemical types of the ash water after mining are Cl·SO4·HCO3-Na,Cl-Na and Cl·SO4-Ca.(3)Using ion combination ratio and principal component analysis to study the reasons for the formation of conventional water chemical ions before and after the mining of different aquifers in Taoyuan Coal Mine,the results show that the formation of cation K++Na+is mainly due to the alternate cation adsorption,and there are also some local sources.The dissolution of salt rock is the same in the three aquifers,but the alternate cation adsorption of the four aquifers and too gray water is weaker than that of coal measure water;Ca2+ and Mg2+ in the three aquifers are mainly derived from the dissolution of salt rock.Mainly the dissolution of carbonate,the anion SO42-mainly comes from the dissolution of sulfate and the oxidation of pyrite,and the source of HCO3-mainly comes from the dissolution of carbonate and desulfurization;(4)Through the analysis of water sample data of the Taoyuan Coal Mine in the past 30 years,the desulfurization and hardening effects of the four waters are not obvious.With the passage of time,the Cl-content gradually increases,and the salinization effect becomes more and more obvious;the water in each aquifer-Rock action is affected by mining activities to a certain extent,so the trend of evolution over time has a certain direction.Figure[31]table[14]reference[71]... |
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