Numerical Analysis of Disturbance Control of Shield Side Crossing SF Oil Tank in Soft Soil Area

Abstract:

Based on the second phase shield tunneling project of Ningbo Rail Transit Line 3， the deformation and stress distribution of SF double-layer oil tank caused by shield tunneling in soft soil area are analyzed by numerical simulation. The results show that the disturbance of oil tank can be effectively controlled by reasonably selecting the parameters such as soil loss rate and frontal additional thrust. The tank farm deformation is mainly vertical deformation， the extreme value of uplift is located in the oil tank near the tunnel， and the extreme value of settlement is located in the central oil tank farm. The oil tank wall close to the shield tunnel has a large additional stress， and all stress values of the oil tank are less than the allowable stress of the tank material. The deformation and additional stress values of the oil tank under full load condition are lower than those under no-load condition. The time history change trend of field monitoring data is consistent with the numerical analysis results， and the surface deformation amount and deformation rate meet the monitoring requirements.