许疃矿深层煤系水水化学成分演变规律与水环境质量评价

Chemical Composition Evolution and Water Environment Quality Evaluation of Deep Coal Water in Xutuan Mine

淮北煤田深层煤炭资源的开采,二叠纪煤系砂岩裂隙水(简称“煤系水”)的防治是煤矿防治水的重要对象。同时,煤系水在矿井水中所占比例较大,矿井水资源化利用有必要弄清煤系水的水文地球化学特征。为此,该研究于淮北煤田许疃煤矿采取了煤系砂岩水样,获取常规水化学组分测试数据,通过水样的Piper三线图与离子比例图分析,揭示矿井深层煤系水水化学演变规律及主要的水文地球化学作用(以阳离子交换作用与溶解作用为主);并选取灌溉水作为矿井水资源化途径之一,利用水质指数法与Wilcox图解进行灌溉用水水质评价。结果表明,深层煤系水直接用于灌溉水时存在潜在的盐碱害风险。研究结果为煤矿煤系水识别与矿井水资源化利用提供了水文地球化学方面的依据。

For the exploitation of deep coal resources in Huaibei coalfield,the prevention and control of Permian coal measure sandstone fissure water(hereinafter referred to as“coal measure water”)is an important object of coal mine water prevention and control.At the same time,coal measure water accounts for a large proportion in mine wa⁃ter.It is necessary to clarify the hydrogeochemical characteristics of coal measure water for resource utilization of mine water.Therefore,Xutuan coal mine in Huaibei coalfield took coal measures sandstone water samples to obtain conventional hydrochemical component test data.Through the analysis of Piper three line diagram and ion proportion diagram of water samples,the hydrochemical evolution law and main hydrogeochemical effects(mainly cation ex⁃change and dissolution)of deep coal measures in the mine are revealed;Irrigation water is selected as one of the ways of mine water resource utilization,and the water quality of irrigation water is evaluated by using water quality in⁃dex method and Wilcox diagram.The results showed that there is a potential risk of salt and alkali damage when deep coal measure water is directly used for irrigation water.This study provides a hydrogeochemical basis for the identification of coal measure water and the resource utilization of mine water.