Cause Analysis and Deformation Prediction of Large Deformation in Water Inrush Section of Tunnel
To ensure the construction safety of the tunnel water inflow section,considering the deformation monitoring results and geological conditions of a tunnel water inflow section,a large deformation feature and its causes are analyzed. Furthermore,the FA-GRNN model is used to carry out the deformation prediction and the subsequent risk evaluation of the water inflow section . The results show that the large deformation in the water inflow section of the tunnel are significant,and the causes are multiple,including terrain and geomorphology,geological structure,groundwater development,construction disturbance,and blasting disturbance,which are interrelated and highly coupled,lead to the large deformation accidents. For the prediction results of the four monitoring points,the average relative error is between 2.04％and 2.21％,which is highly accurate and verifies the applicability of the FA-GRNN model. Moreover,the subsequent deformation rate of the water inflow section is between 2.85 and 4.75 mm/d. The rate value is still large without a convergence trend,posing a significant risk,and the reinforcement measures are recommended as soon as possible.
万方数据
维普
