A Dissertation In Geological Engineering Suntuan Coal Mine Groundwater Chemical Composition Formation Characteristics And Its Cause Analysis

Suntuan coal mine has complex hydrogeological conditions,so water damage is one of the important hidden dangers affecting mine safety production.The mine is mainly affected by coal measure sandstone water and taiyuan formation limestone water.Water inrush accident occurred at coal face No.10 on 1028.In order to further understand the sun Tuan coal mine threatened by water disasters,guidance of coal mine safety production,in this paper,through investigating the geological tectonic environment,sort out the main aquifer conventional ion(Ca2+?Mg2+?K++Na+?HCO3-?SO42-?Cl-)content,TDS and pH data,the methods of statistics and theory analysis to analyze its chemical characteristics and evolution law of formation water come to the conclusion:1.Affected by mining activities,suntuan goldfield's main aquifer contains mainly K++Na+,while its anion content is mainly HCO3-.Most of the variation coefficients of ions in groundwater are greater than 0.5,and the chemical composition of groundwater is unstable.According to TDS distribution,the groundwater runoff direction of the mining area is:sandstone water from south to north,limestone water from south to northeast.The cumulative relationship between the main ionic components of aquifers and TDS indicates that the cationic migration rules of the four water-bearing,sandstone and grey water are as follows:K++Na+>Mg2+>Ca2+;The anion migration rules were HCO3->Cl->SO42-.2.Using the ion combination proportional coefficient method,it can be concluded that Mg2+ and Ca2+ are dissolved carbonate or sulfate in the migration field of groundwater during underground coal mining;The K++Na+ originated from the underground water of the mine,and cation exchange occurred.The formation of SO42-and HCO3-is affected by pyrite oxidation,carbonic acid dissolution equilibrium and desulfurization acid action.3.According to factor analysis and principal component analysis,the"desulphurizing acid" in the evolution of the four water-bearing plants showed a weakening trend;Sandstone water shows obvious "hardening" effect and runs through the whole evolution process.From the characteristics of "softening" before mining,the evolutiontrend of "hardening" gradually appears.Before and after mining,the oxidation of pyrite,dissolution of carbonate,sulfate and cation alternate adsorption of ordovician limestone water are relatively weak.Due to the positive correlation between Na+ and Cl-in the water samples of "four aquifers" and Taihui aquifers,the "salinization" effect of water quality is obvious,which acts on the whole process of evolution.Figure[31]Table[19]Reference[71]...