ABSTRACT
The existing metro shield tunnel structure will be greatly impacted by the improper construction of neighboring underground structures. This research examines the stress of shield segment under different ovality induced by underlying tunnel construciton in Granite residual soil. In this paper, based on the field measurement data, a refined three-dimensional finite element model is established considering the detailed structure components including shield segements, connection bolts, nuts and installation holes. The quantitative relationship between the ovality of the shield segment and the stress of the lining structure is studied. The results show that as the ovality of the shield segment increases, so does the maximum principal stress and maximum shear stress of the segment structure. The maximum shear stress of the structure has a linear relationship with the ovality, whereas the maximum principal stress of the shield structure has a more obvious trend with the ovality and a nonlinear relationship with the ovality.
