Deformation Prediction of Shield Construction Based Soil Unified Movement Model and Optimization Selection of the Reinforcement Schemes

: In order to control the construction deformation of the tunnel under the existing highway, the pavement deformation under the condition of the tunnel section of shield tunnel in Shanghai was calculated. The deformation of the pavement under the condition of the tunnel was calculated, and numerical simulation is carried out with FLAC3D numerical simulation. In view of the original pavement deformation amount and shield construction deformation increment and over the pavement deformation specification maximum allowable value of contrast the single grouting reinforcement, setting pile and grouting combined with the road pile foundation reinforcement of three different reinforcement scheme is determined. Through the numerical simulation analysis to determine the scheme for the optimal solution, after the construction of the comparison of the actual deformation, second scheme on deformation control is better than expected. It is proved that the prediction with high accuracy and this is an important reference for similar projects.