Analysis of water conductivity and water gushing source of collapse column in changcun mine

Based on the water conductivity of Lu 'an coal mine collapse column and the analysis of the causes of water inrush of Lu 'an coal mine collapse column, the water inrush source of collapse column in Changcun Mine was comprehensively analyzed by stable isotope tracing method. It was found that the groundwater runoff conditions and geological structure condition of collapse column seriously affected the water inrush of collapse column. It is determined that the water inrush source of N2-7 collapse column in Changcun coal mine is the same as the Upper Sandstone water source, that is, the infiltration supply of atmospheric precipitation, but has no direct connection with the aquifer of Ordovician limestone., which provides a relatively reliable method for the water inrush source identification of collapse column.