To investigate the stability of the excavation face of a box culvert when it overlaps with a tunnel underpassing the railway, the project of Xiamen Rail Transit Line 6, where tunnel and box culvert overlappingly underpassed Haicang Railway branch, was taken as an example. The finite difference software FLAC3D is used to explore the active failure mode of the excavation face of the box culvert, and the upper limit theorem of limit analysis and spatial discretization technology are adopted to solve the ultimate support force and stability of the excavation face of the box culvert under the action of supporting stress and train load. Finally, the theoretical analytical solution is compared with the numerical solution and the field-measured data. The results show that: (1) The tunnel culvert excavation face presents a log-double helix failure mode under tunnel and train loads. With the decrease of excavation ratio and the increase of buried depth ratio, the disturbance of active failure of the tunnel culvert excavation face gradually decreases and does not extend to the ground. (2) The ultimate support force of the box culvert excavation face was positively correlated with the buried depth within a certain range, while negatively correlated with the internal friction angle and cohesion of the soil mass. (3) The percentage difference between the theoretical solution and the numerical solution for the derived limiting support force was within 8.70%~12.79%. Furthermore, the theoretical solution aligned well with the field monitoring data, confirming the rationality and effectiveness of the theoretical model presented in this study.
Peng Liqian
. Stability Analysis of Excavation Face of Box Culvert under the Influences of Tunnel Construction and Train Load[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 989
-998
.
DOI: 10.20174/j.JUSE.2024.S2.56
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