地铁区间渡线段大跨无仰拱隧道设计研究

On the Design and Construction of a Large-Span Non-Inverted-Arch Metro Tunnel of a Junction Line

以青岛地铁2号线某区间渡线段暗挖隧道为背景,通过对地质条件的研判分析,进行地铁暗挖大跨隧道不设置仰拱的研究与设计。计算结果及工程实践反馈,暗挖大跨无仰拱隧道的初支及二衬受力和变形在设计范围内,可供今后类似条件下地铁暗挖隧道结构设计参考。

With the construction of an under-cut tunnel of a junction line of a certain section of Line 2 of Qingdao Metro as the background, an under-cut large-span metro tunnel with no inverted arch provided is studied and designed in the paper. Accord-ing to the results of our calculations and the feedback of the construction practice, the stress and the deformation of the initial support and the secondary lining of the large-span metro tunnel without no inverted arch are both within the designed range. The paper may serve as a useful reference for the structural design of other undercut subway tunnels in similar conditions in the future.