宽沟煤矿地下水化学特征及其指标

Underground water hydrochemical characteristicsand indexes of Kuangou Coal Mine

地下水水化学特征及其演化规律在煤矿开采和防治水害中占有重要地位,以宽沟煤矿为研究对象,综合使用Piper三线图,Gibbs图和离子比例系数法等方法对宽沟煤矿地表水、地下承压水和矿井水化学特征及来源进行研究,并且以宽沟煤矿各水体的Cl^(-)浓度为度量,定量计算它们之间的水力联系程度。研究表明,地表水化学类型为HCO_(3)-Ca型和SO_(4)-Ca型,矿井水和地下承压水的水化学类型为HCO_(3)-Na型;3种水体水化学成分的形成作用主要受岩石风化控制,还受阳离子交替吸附作用的影响,其中地表水主要离子来源于碳酸盐矿物的溶解,而承压水和矿井水的主要离子来源为硅酸盐矿物的溶解,并且研究区地层中有一定量的硫酸盐矿物;地表水与地下承压水水力联系、地表水与矿井水水力联系分别为0.283和0.276,联系程度中等,而地下承压水和矿井水水力联系为0.0095,可以确定矿井水来源于地下承压水。

The characteristics and evolution of groundwater chemistry play an important role in coal mining and water disaster control.Taking Kuangou Mining area as the research object,we studied the chemical characteristics and sources of surface water,confined water and mine water in the mine by comprehensively using Piper trilinear diagram,Gibbs chart and ion ratio.The degree of hydraulic relation between them was quantitatively calculated by measuring the Cl^(-)concentration of each type of water.The results show that the chemical types of surface water are HCO_(3)-Ca and SO_(4)-Ca,and that of mine water and confined water is HCO_(3)-Na.The formation of the three types of water chemical composition is mainly controlled by rock weathering.In addition,it is also affected by the alternating adsorption of cations.The main ion source of surface water is from the dissolution of carbonate minerals,while the main ion source of confined water and mine water is from the dissolution of silicate minerals,and there is a certain amount of sulfate minerals in the strata of the study area.The hydraulic relation between surface water and confined water,and between surface water and mine water are 0.283 and 0.276,respectively,indicating a moderate degree of connection.The hydraulic relation between confined water and mine water is 0.009,which is very close,indicating that mine water is from the confined water.