Research on settlement of immersed tunnel elements under tidal load with consideration of element-soil effect
WEI Gang1，LU Shijie2
(1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；2. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Tidal load isfitted by trigonometric function，and One-dimensional nonlinear consolidation settlement of layered soils is calculated under tidal load. Based on the tidal load and the result of subsurface settlement，Winkler foundation model is used to calculatedequivalent subgrade coefficient at different time. Considering the effect of joint，an element-joint model is built to analyze the vertical displacement of immersed tunnel elements under tidal load. Rely on Yongjiang Immersed Tunnel in Ningbo，the vertical displacement of joints and the midpoint of the elementsis calculated under tidal load，and the theoretical results are compared with the measured results. The study shows that the calculated vertical displacements of Joint 2 are consistent with the monitoring data. It provides validation of the proposed method. The range of vertical displacement amplitude of Yongjiang Immersed Tunnel¢s elements is 4–8mm under tidal load. The maximum displacement amplitude is present to the midpoint of Element 3.The displacement amplitude of Element 3 in a day and in a year reaches 6.9mm and 7.4mm respectively. As for one section of an element，its displacement amplitude in a day is slightly larger than that in a year，and they are positively correlated in different sections. As for one element，its displacement amplitude of midpoint is larger than that of joints. As for the same position of different elements，the closer to the midpoint of tunnel the section is，the lager the displacement amplitude is.
魏 纲1，陆世杰2. 考虑管土效应的潮汐荷载引起沉管隧道管节沉降研究[J]. 岩石力学与工程学报, 2018, 37(S2): 4329-4337.
WEI Gang1，LU Shijie2. Research on settlement of immersed tunnel elements under tidal load with consideration of element-soil effect. , 2018, 37(S2): 4329-4337.
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2018, Vol. 37 
