Study on Hydrogeochemical Characteristics of Limestone Aquifer in Coal Measures
The hydrogeological conditions of North China type coalfield are complex.With the increase of mining depth,water damage accidents occur from time to time.In order to prevent and control mine water disasters,this paper takes Gubei Coal Mine of Huainan Coalfield as an example.Through systematic analysis of its hydrogeo-logical characteristics,it is determined that the limestone water of Taiyuan Formation is the direct threat water source for coal mining.Based on the hydrochemical type and conventional ion analysis,the conclusion shows that the cations of Taihui water in the study area are mainly K++Na+,and the main anions are Cl-,and the hydro-chemical types of each mining area and the area affected by the collapse column are obviously different.In addi-tion,the contents of K++Na+,Cl-and HCO3-increased significantly with the increase of depth,and the con-tents of Ca2+,Mg2+and SO4-decreased due to the influence of groundwater recharge,runoff and discharge con-ditions,circulation speed and cation exchange.
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