Abstract
In the soft soil stratum, problems such as non-uniform settlement, leakage, and loss of bearing capacity occur during a shield tunnel's construction and operation process. The wrong selection of the inner diameter of the shield tunnel segment will even increase the scale of the problem. It has not been clear how the inner diameter of the segment will influence a tunnel's bearing capacity. Thus, a 3D numerical model is built to determine the mechanism between the inner diameter and the bearing capacity. Two kinds of the diameter of shield tunnel, which refer to 5.5m and 5.9m, are analyzed in this model. The results indicate that the deformation mechanism of these two kinds of shield tunnel in both normal loading process and a loading process concerning the surrounding engineering activities; meanwhile, it is found that the shape of the deformed tunnel is like a horizontal ellipse; finally, the deformation mechanism of segment and bolt is further revealed.
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