Hydrochemical and environmental isotope analysis of mine water sources in permafrost regions
This paper takes the frozen soil area of Shengli Coal Mine in Wujiu Coalfield as the research object,and studies the source and supply characteristics of mine water in the frozen soil area.Seven groups of representative water samples selected from the field are studied utilizing hydrochemical analysis and four environmental isotopes of 13C,14C,D,and 18O.The content of each ion is determined by hydrochemical analysis,and the types of water samples are preliminarily classified.Then,the 11 indexes of hydrochemistry are reduced by principal component analysis,and the first two representative main factors are selected for subsequent hydrochemical analysis.The results show that surface water,Quaternary water,bedrock water,and goaf water cannot be clustered from the perspective of hydrochemistry.It is difficult to identify water sources by simple hydrochemical indicators,and it is still necessary to combine environmental isotopes for comprehensive analysis.The distribution characteristics and carbon isotope anomalies of 13C,14C,D,and 18O are analyzed to clarify the source and recharge characteristics of mine water.The results show that the identification of groundwater source is not obvious by 13C analysis alone,and D can be used as the identification mark of roof bedrock fissure water and Quaternary water and has good consistency with 18O,but the reliability is not as good as 14C.Surface water and Quaternary water receive rapid recharge from atmospheric precipitation,while bedrock fissure water and Quaternary permafrost ablation water receive trace recharge from shallow Quaternary water.The water supply of the mine is greatly affected by seasonality.The Quaternary seasonal frozen soil with shallow buried depth in summer is thawed,and the thawed water,surface water,and Quaternary water flow into the mine along the fissure.In winter,the temperature decreases,and the Quaternary permafrost fissures freeze again,re-forming a stable aquifuge and blocking the upper water into the mine;the average mixing ratios of Quaternary water in bedrock water(SLMK-6)and mine water(SLMK-4)are 17.14％and 11.50％,respectively,and the average mixing ratios of surface water are 9.48％and 1.57％,respectively.The research results are consistent with the actual situation,which provides a basis for the prevention and control of water disasters in Shengli Mine,and also provides a reference for the identification of similar mine water sources in permafrost regions.
safety engineeringenvironmental isotopeheadstream recognitionhydrated layer of Quaternary systemfrozen soil area
万方数据
维普
