| Coal is the most important energy resource in China and has made outstanding contributions to the development of the national economy.Mine water damage has always been one of the most serious disaster accidents in the safe mining of coal.Gugui Mining Area is located in the central and western part of Panxi New Area in Huainan Coalfield.There are two pairs of production shafts:Guqiao and Gubei.The Group A coal resources in the mining area are rich in reserves,geological and hydrogeological conditions are complex,and there has been water inrush from the limestone floor water.As the mining area extends deeper,the face is increasingly threatened by water inrush from the floor limestone.Therefore,studying the chemical characteristics of limestone water chemistry is of great significance for the safe mining of group A coal in the mining area.Taking Gugui mining area as an example,based on the collection,collation and analysis of the geological and hydrogeological data of the mining area,the method of Piper three-line map,ion ratio analysis,and multivariate statistics method was used to study the hydrogeology of the limestone aquifer.The conditions,chemical composition of karst water,and their distribution characteristics were obtained as follows:(1)Karst aquifers mainly include fractured aquifers of the Taiyuan Formation limestone and Ordovician limestone aquifers,among which the Taiyuan components are C3?,C3?,and C3? limestones,and the C3I limestone is the group A coal seam floor.The main aquifer of water.The water-richness of the limestone aquifer in the Taiyuan Formation is relatively weak,but there is a limestone water supply to the Group C3?limestone water in the Group A coal mining,which leads to the threat of coal seam mining from karst water damage.(2)Karst water chemistry types In addition to the individual drilling water types of the C3I limestone,the types of Cl · SO4-Na and Cl-Na · Ca are the types of the other borehole waters,which are Cl-Na types.Water chemistry features high salinity,high chloride content,and low sulfate content.(3)The distribution characteristics of water chemistry are as follows:In the horizontal direction,the distribution of ion peak regions is basically similar,and the ion concentration gradually increases from northwest to southeast,which is consistent with the direction of limestone water runoff;each vertical aquifer(group)The ion content is basically the same.The content of TDS in the karst water of the austenitic aquifer is the highest.The content of TDS in the C3I group of the Taishi aquifer is the lowest,and the content of the TDS increases with the depth of the aquifer.(4)Ion characteristics:The karst water cations of C3?,C3?,C3? and Ordovician limestone aquifers are mainly K++Na+,the anions are mainly Cl-,and the secondary anions are SO42-,which is the type of water chemistry.Consistent.Karst water chemistry and the main source of ions are the dissolution of karst water on minerals... |
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