浅埋超大直径盾构隧道施工上浮控制技术研究
Research on Uplift Control Technology of Shallowly Buried Super-Large-Diameter Shield Tunnel Construction

当前盾构隧道得到了广泛的应用，但在实际施工过程中常遇到开挖卸荷而导致的隧道上浮，地表隆起等问题。此类现象在大直径盾构隧道施工中将更明显，因此需要采用有效的隧道上浮控制措施。本文总结了一系列常用的控制措施，依托上海北横通道超大直径盾构区间项目案例，建立三维精细化数值模型，基于此分析地面堆载、隧道内压重和设置抗浮板三种常用上浮控制技术的效果差异，并给出不同条件下的施工建议。本文的研究结论对类似项目的抗浮措施的选择具有一定的指导意义。
Shield tunnels are commonly used in construction, but they can encounter issues such as uplift during excavation and unloading, as well as surface uplift. These problems are more pronounced in the construction of large-diameter shield tunnels. Effective control measures are necessary to address these issues. This paper presents a summary of commonly used control measures, using the case of the Shanghai Beiheng Passage super-large-diameter shield tunnel interval project. It establishes a three-dimensional refined numerical model and analyzes the effectiveness of three commonly used uplift control techniques: ground stacking, in-tunnel pressurization, and installation of anti-floating boards. The paper concludes with construction recommendations for different conditions. The conclusions of this paper are significant in guiding the selection of anti-floating measures in similar projects.