Finite difference analysis of impact of undercrossing super-large-diameter shield tunnel on training jetty

Based on the tunnel project of highway passage along Yangtze River in Shanghai, the impat of undercrossing super-large-diameter shield tunnel on training jetty is analyzed by using the finite difference methods. The deformation of jetty structures, settlement difference and ground settlement of jetty top are used to evaluate the improvement effectiveness of jetty structures. The numerical simulation method in cooperation with the construction experience is employed to study the soil reinforcement at the excavation face of shield tunneling, and its advantages and disadvantages are analyzed. Finally, based on the numerical analysis and in-situ monitoring results, the key construction parameters and control measures of the shield tunnel undercrossing the training jetty are obtained.