Study on Mechanical Response Law of Shield Assembly Tunnel with Complex Section During Construction
DOI:
https://doi.org/10.14311/Keywords:
Large diameter shield, Assembly tunnel with mushroom shape, Intelligent monitoring, Numerical simulation, Mechanical responseAbstract
To clarify the stress and deformation behavior of complex section assembly tunnel with mushroom shape, the mechanical behavior variation law of assembly tunnel in different construction stages were explored through intelligent monitoring. The longitudinal and cross-sectional distribution characteristics of the mechanical behavior of the assembly tunnel and the deformation control effect of the support on the surrounding rock were analyzed based on numerical simulation. Through comparative analysis, the applicability of different excavation methods in this project is explored. By comparing with theoretical methods, the bearing characteristics of the assembly tunnel were discussed, and the engineering suggestions were given. The results show that the excavation of the lower section has little effect on the arch of the mushroom head and has a continuous impact on the side wall. The arch support of mushroom head can enhance the restraint ability of lower section support to surrounding rock deformation. The initial support deformation and the bolt axial force of the mushroom head gradually decrease from the position near the centroid to both sides. In the corner of the wall, the support appears to deviate from the tunnel, where the bolt is compressed. The contact stress of mushroom head increases first, then decreases and then increases from the position near the centroid to both sides. The stress in the transition area between the arch and the straight wall on both sides increases locally, and the stress concentration occurs at the corner of the wall. The deformation of the initial support and the bolt axial force on both sides of the lower section increase first and then decrease from top to bottom, while the law of the contact stress is opposite. For the combined support of flat arch and vertical straight wall, more attention should be paid to the stress and deformation characteristics of arch foot and side wall in engineering.
Received: 13.06.2024
Received in revised form: 13.06.2025
Accepted: 24.11.2025
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