Hydrogeochemistry characteristics of groundwater and its application to fault conductivity identification in Tangjiahui Mine
In order to identify the hydraulic conductivity of the DF1 fault in Tangjiahui Mine in the northern part of the Ordos Basin,thus to prevent mine water burst in the mining and tunneling faces,36 sets of water samples were collected from Permian sandstone water and Ordovician limestone water(Ordovician water)in the mine,and the chemical characteristics and genesis of the mine groundwater were studied using Piper three-line diagram,ion ratio method and saturation index method.Based on the characteristics of water chemistry,the fault water conductivity was analyzed.The results show that the water chemical type of sandstone is Cl·HCO3-Na type and Cl-Na type,and the chemical type of Ordovician lime water is Cl-Na type.The Na+ in sandstone water and Ordovician water mainly comes from the dissolution of rock salt and silicate;the calcite in Ordovician water is in a balanced and supersaturated state,and the dolomite is in an unsaturated state and has undergone cation exchange adsorption.As it gets closer to DF1 fault,the water inflow TDS of floor grouting hole increases.As time goes on,Cl-increases gradually in the 11-4#hole,indicating that the mixing ratio of Ordovician limestone water in the borehole is increasing,DF1 fault is a water-conducting fault in this section.
Tangjiahui Minehydrochemical characteristicsion ratio factorsaturation indexfault water conductivity
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