Hydrogeochemical Characteristics And Genetic Pattern Of Karst Under Concealed Conditions

Huainan mining area is located in the southern margin of the North China Plate.It is one of the typical northern karst areas.Under the influence of tectonic geology,the carboniferous,ordovician and Cambrian strata of huainan mining area are well developed.The hydrogeological conditions are complex.Under the condition of buried deep?covered by loose Cenozoic strata?,the mining of coal seams in group A is threatened by karst water damage in the lower part of carbonic acid.The chemical composition characteristics of karst water are analyzed,the controlling factors are studied,and the genetic model is constructed,so as to provide certain basis for the prevention and control of karst water damage in coal floor.Lower part of this paper,the group A in huainan mining area coal seam of carboniferous,the ordovician karst water as object,on the basis of system analysis of hydrogeology condition,sample collection and analysis of karst aquifer water point,using the multivariate statistics,water chemical composition?piper diagram,ion ratio?,principal component analysis and hydrogeochemical inverse modeling method,and combining the theory of groundwater system,concealed under the condition of karst is mainly studied hydrogeochemical characteristics,study the controlling factors and genetic pattern,the main conclusions are as follows:?1?There is a certain difference between the water quality of the outcrop area and the water quality of the concealed area.The whole outcrop area the water quality types are mainly HCO₃-Na+K·Ca,HCO₃-Ca,HCO₃·Cl-Na+K type;the concealed area are mainly water quality types such as Cl-Na+K,Cl·HCO₃-Na+K,Cl·SO₄-Na+K and HCO₃-Na+K,its water quality is more diversified.?2?The study found: concealed buried deep under the condition of the partition between the cation concentration difference is small,but the anion in ?,? area is given priority to with Cl-,and ? area mainly HCO₃-,Cl-phenomenon,the oxidation-reduction environment of groundwater and deep mining activities.?3?The three zones in the concealed zone have cation exchange in the aquifer of Taiyuan Formation,but the oxidation-reduction environment of each zone is different,which is related to the burial conditions;the Ordovician is mainly desulfurized,indicating the overall aquifer Mainly to restore the environment.?4?The hydrogeochemical inversion simulation method was used to verify the water chemistry formation mechanism of each aquifer in each region.?5?Comprehensive analysis shows that the structure,burial conditions,temperature and groundwater runoff are the controlling factors affecting the hydrogeochemical characteristics of the area.?6?According to the hydrochemical characteristics and control factors of the above regions,hydrogeochemical genetic models such as "Closed static reserve","Semi-open runoff" and "Partial open supply" were divided and constructed.The above research results not only for the further analysis of hydrogeological conditions of huainan mining area provides A new path,and also for the system to know hydrogeochemical properties of huainan coal mine,from genetic model known to provide scientific basis for its formation process,what is more important for the pan xie mining area,cut-east liuzhuang mine water disasters in the process of coal mining group A provide important reference for the establishment of prevention and control measures.Figure [56] table [18] reference [97]...