Mine inflow prediction and numerical simulation on descending flow field of karst water based on Visual Modflow

In order to ensure the safety in coal mining,by using interntional Visual Modflow groundwater seepage simulation software,a three-dimensional seepage numerical model of karst water is established based on large scale outflow test of the second level limestone water,which is of Taiyuan formation belong to carboniferous system of Siwan mine in Hebi mining area.By the model distinguishing and testing,the seepage flow field and the water level regime variation in the outflow test are simulated successfully.The calculative mine inflow of the designed descending level on the model is close to the use of correlation curve extrapolation,the funnel equalization and analytical method.It has been as a significant parameter in reconstructing drainage system,which provided scientific basis for suffer confined water threatening Taiyuan folder safety and reasonable coal mining.