Influence of key parameter values in Modflow on mine water inflow prediction
In response to the problem of water inrush during mining in the Ordos region,Hetaoyu Coal Mine was taken as the research object,the regional hydrogeological conditions were sorted out,a reasonable conceptual model and boundary range was determined,and a Visual Modflow numerical model was established.The drainage ditch boundary module of the model was applied to predict the changes in mine water inflow in response to the mining progress of the working face.An uncertainty analysis was conducted on the drain module lumped conductivity C and hydraulic conductivity K of the drainage ditch,and it was determined that the value of C has a more significant impact on the prediction of water inflow in the working surface.Based on the actual water inflow of two adjacent working faces in Yadian Coal Mine,C value of the study area was inversed to determine the range and used in the prediction for Hetaoyu working face.The results show that the predicted water inflow of the working face will increase with the increase of the C value.When the C value is about 6.5×10-5,the water inflow of the Yadian working face is close to the actual water inflow.Based on this value,the water inflow of each working face in Hetaoyu Coal Mine was calculated,after the completion of the five working faces,the total water inflow of the mine was 2697.2 m3/h.
prediction of water inflowVisual Modflowdrainage ditch boundarypermeability coefficient of aquiferdrainage coefficient
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