Analysis of Influence on Internal Force of Shield Tunnel Structure under Action of Track Beam Support

Considering actual situation in engineering projects, the influence of straddle monorail track beam support on the internal force of shield tunnel structure is studied with finite element method. Research results show that: under the action of track beam support, the bending moment distribution at the bottom of shield tunnel changes from positive to negative, and the bottom axial force of shield tunnel decreases evidently, and the bottom shear increases and changes drastically in certain part; the support load of track beam has little effect on the structure above the center of shield tunnel; with the adoption of grade 8.8, the shear capacity of shield tunnel segment at track beam support can meet the stress requirements, and the safety margin is large.