Abstract
Considering the feature of soil layers and surrounding architectures in line 1 of Ningbo metro, finite element method is used to analyze the impact of displacement of existing shield-tunnel, which comes from the building load on the shallow foundations closed to the metro tunnel. Then, the effect feature of upper load of shallow foundation on metro tunnel is got. It is shown that both the horizontal displacement and the vertical displacement of shallow foundations decrease with increase of the horizontal projection distance between loading position and tunnel, and the reducing magnitude of the vertical displacement is significantly larger than that of the horizontal displacement. Accordingly, it is proposed that both the horizontal displacement and the vertical displacement should be controlled within 10mm when the loading width is approximately 10m, and it can be regarded as the controlling distance of the building load of metro tunnel.
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