Mechanical Behavior of the Special Segment Structure during Upward Shield Tunnel Construction

The upward shield method in horizontal tunnels has the advantages of small ground space occupation, low construction cost, and short period, which expresses substantial economic benefits. special segments corresponding to area have design requirements, different internal force calculations analyses should be carried out. To determine mechanical behavior segment structure during tunnels, theoretical calculation formula is deduced based on average uniform rigidity ring method. Moreover, bending moment axial are numerically simulated analyzed using Midas GTS NX software. Finally, finite element results compared analyzed. show that values open adjacent quite tunnel construction. Furthermore, with arch crown bottom ring, stress at waist most unfavorable. difference between may cause unbalanced deformation, leading damage radial joint. In construction, attention given shear strength joint stiffness waist.