乌东煤矿地下水水化学特征及其指示

为了研究乌东煤矿煤层顶板含水层之间的水力联系,采用了统计分析、Piper三线图、Gibbs图等方法定性分析了基岩地下水、第四系地下水以及地表水之间的水力联系.利用不同水体的Cl-浓度差异性,计算了相邻含水层之间的水力联系度,定量判别了它们之间的水力联系程度.结果发现,所有地下水样品的pH介于7.1～8之间,都为弱碱性水...

Hydrochemical Characteristics of Groundwater in Wudong Mine and Its Significance

The hydrochemical characteristics of groundwater are helpful to judge the hydraulic connection between adjacent aquifers. In this paper, Wudong Coal Mine is taken as the research object, and the hydraulic connections among bedrock groundwater, Quaternary groundwater and surface water are qualitatively analyzed by using general hydrochemical characteristics analysis, Piper three-line diagram and Gibbs diagram. Using the difference of Cl- concentration in different water bodies, the hydraulic connection degree between adjacent aquifers is calculated, and the hydraulic connection is quantitatively determined. The results showed that the pH of all groundwater samples ranged from 7.1 to 8, which were weakly alkaline water. As the depth of aquifer increases, the TDS of groundwater gradually increases, and the TDS of surface water and quaternary groundwater are lower than that of bedrock aquifer. The main hydrochemical types of bedrock groundwater, quaternary groundwater and surface water are Cl·SO4-Na, HCO3·SO4-Na·Ca, and SO4·Cl·HCO3-Na and SO4·Cl·HCO3-Na·Ca, respectively. Bedrock groundwater samples are affected by concentration, surface water and quaternary groundwater are affected by weathering and evaporation of rocks. At the same time, cation exchange occurred in groundwater and surface water in the study area. The connection degree between Quaternary groundwater and surface water is 0.361, which is medium. The connection degree between Quaternary and bedrock groundwater is 0.404, which is low. The results can provide a reference basis for the prediction of mine water inflow and the prevention and control of water inflow in the later period.