Hydrogeochemical characteristics and genetic analysis of coal-measure sandstone fissure water in Gubei Coal Mine

In this paper, 76 groups of sandstone water samples from the roof of four main coal seams in Gubei Coal Mine were systematically studied by means of hydrochemical testing, statistical analysis and hydrogeochemistry analysis. The types of hydrochemical action of roof water in each coal seam were identified and the causes of their formation were analyzed in detail.The results show that under the coal seam burial condition and the hydrochemical environment in Gubei Coal Mine, the 13_-1 coal seam is Cl-Na type, mainly characterized by dissolution filtration and cation alternating adsorption; 11_-2 coal seam is HCO₃·Cl-Na type, mainly characterized by dissolution and filtration; the 6_-2 coal seam is SO₄·HCO₃-Na type, mainly characterized by alternating adsorption of desulfurization acid and cation; the 1 coal seam is HCO₃·Cl·SO₄-Na type, mainly characterized by leaching and dissolution. The research results can provide guidance for identifying the characteristics of water-rich aquifer and groundwater runoff, and then provide important basis for making mine water control decision.