运营期沉管隧道沉降变形分析

摘要:

本文针对沉管隧道在设计和建造过程中往往注重抗浮而忽略运营期的沉降，以某沉管隧道16年的长期沉降监测数据为范本，对隧道沉降的纵向分布规律，沉降稳定性分析，隧道差异沉降以及各个管节自身的竖向弯曲变形姿态进行系统分析。分析结果显示沉管隧道的沉降受到地基刚度分布、覆土厚度以及周边环境的影响具有很大的不确定性，隧道姿态的变化会导致沉管隧道各管节出在不同形态的自身竖向弯曲状态，进一步加剧管节受力的复杂性。综合分析显示该隧道整体趋于稳定状态，相关分析成果也可以作为同类沉管隧道结构安全分析的技术参考。

Abstract:

In view of the fact that the immersed tunnel often pays attention to anti floating and ignores the settlement in the operation period in the process of design and construction, taking the long-term settlement monitoring data of a immersed tunnel for 16 years as a model, this paper systematically analyzes the longitudinal distribution law of tunnel settlement, settlement stability analysis, tunnel differential settlement and the vertical bending deformation attitude of each pipe section. The analysis results show that the settlement of immersed tunnel is greatly affected by the distribution of foundation stiffness, soil cover thickness and surrounding environment. The change of tunnel attitude will lead to the vertical bending state of each pipe joint of immersed tunnel in different forms, which further aggravates the complexity of pipe joint stress. The comprehensive analysis shows that the tunnel tends to be stable as a whole, and the relevant analysis results can also be used as a technical reference for the structural safety analysis of similar immersed tunnels.