Analysis of Influence on the Super-Large-Diameter Shield Tunnel by Stockpile Unloading

As the super-large-diameter shield tunnel sprouts up, there will be more and more constructions adjacent to the super-large-diameter shield tunnel. As the newly-built structure changes the existing stress field, it will inevitably deform the super-large-diameter shield tunnel and bring hazard. Based on the soil stockpile adjacent to Ying Bin San Lu shield tunnel in the flight area of Shanghai Hongqiao Airport, the digital model was established by PLAXIS finite element analysis software to analyze the influence on the super-large-diameter shield tunnel by the soft soil area and different stockpile unloading time sequence. According to the findings, it’s recommended to carry out massive stockpile unloading adjacent to the shield tunnel in section and in layer and conduct unloading first when far from the tunnel, thereby minimizing influence on the shield tunnel.

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