新街台格庙矿区首采井田矿井水水化学特征及数值模拟预测

Hydrochemical characteristics and numerical simulation prediction of mine water in the first mining field of Xingjie Taigemiao mining area

基于内蒙古新街台格庙矿区首采井田中地下水和岩石样品取样分析,探讨了矿区充水含水层水化学特征及空间分布规律,并利用地下水模型系统(GMS)软件对矿井水中典型水化学组分进行了预测。研究结果表明,新街台格庙矿区首采井田充水含水层为直罗组延安组,地下水阳离子以钠离子为主,组分平均含量为906.4 mg/L;阴离子以硫酸根为主,其含量均值为2289.3 mg/L。直罗组延安组砂岩去离子水反应使得pH值增加,逐渐趋于碱性,且离子组分浓度逐渐增大,其中阳离子中增幅较大的为钙离子和钠离子。阴离子中增幅较大的为重碳酸根离子和硫酸根离子,最终水化学类型为SO_(4)·HCO_(3)Ca·Na型。通过模型预测了台格庙矿区首采井田矿井水涌水水质,阳离子包括钾离子、钠离子、钙离子和镁离子,浓度分别为3.2~15.8、385~765、143.6~194.5、30.5~45.5 mg/L;阴离子包括硫酸根离子和氯离子,浓度范围分别为1170~1900、82.07~91.08 mg/L。

Based on the sample analysis of groundwater and rock from the first mining field in Xinjie Taigemiao mining area in Inner Mongolia,the hydrochemical characteristics and spatial distribution patterns of the aquifer in the mining area were explored,and the typical hydrochemical components in the mine water were predicted using groundwater model system(GMS)software.The results indicated that the water filled aquifer of first mining field in the Xingjie Taigemiao mining area was from the Zhiluo-Yan'an Formation,the groundwater cations were mainly sodium with an average component content of 906.40 mg/L,while the anions were mainly sulfate ions with an average content of 2289.3 mg/L.The reaction between the sandstone and deionized water in Zhiluo-Yan'an Formation increased the pH value and the groundwater gradually tended towards alkalinity;the concentration of ion components gradually increased,with calcium ions and sodium ions showing a larger increase in the cations.The anions with larger increase were bicarbonate ions and sulfate ions,and the final hydrochemical type was SO_(4)·HCO_(3)-Ca·Na.The water quality of the first mining field of the Taigemiao mining area was predicted through a model,and the concentrations of cations including potassium ions,sodium ions,calcium ions,and magnesium ions were 3.2-15.8,385-765,143.6-194.5,and 30.5-45.5 mg/L,respectively;Anions included sulfate ions and chloride ions,with concentrations range of 1170-1900 and 82.07-91.08 mg/L.