Comprehensive geophysical exploration and three-dimensional geological model construction of goaf in closed pit coal mine in Karst Area

In order to clarify the hydrogeological conditions of closed pit mining area, the hydrogeological conceptual model of mining area is constructed. Taking a closed pit coal mine in Majiang County, Guizhou Province as the research object, through the systematic geophysical exploration of high-density resistivity method, charging method, transient electromagnetic method, nuclear magnetic resonance method and drilling in key areas, combined with the production data and geological survey results of the mining area, relying on EVS geological modeling software, the hydrogeological model of the mining area is constructed, which realizes the visualization of groundwater recharge, runoff and discharge process, and provides important support for pollution control in closed pit mining area.