舟山沉管隧道南岸深基坑围护受力实测分析

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Abstract Abstract：Research purposes： The maximum excavation depth of the deep foundation pit at south shore of Shenjiamen port Zhoushan subsea tunnel is 14.8m. SMW piles, concrete supports and steel supports are used to support the foundation pit. It is the deepest waterfront immersed tube tunnel pit in Zhejiang province, and the surrounding environment is extremely complex. This paper studied the stress of retaining structure, earth pressure and pore water pressure during the pit construction, which can provide valuable experience for the similar projects. Research conclusions：(1)The supports axial force increases with the excavation of the foundation pit, and the corresponding support is affected most seriously, the force of the upper supports are uneven. (2)Pile moment also increases with the excavation of the foundation pit, the supports can effectively reduce the maximum pit moment. (3)Measured earth pressure above the excavation face decreases when excavation depth increases during initial excavation, while measured earth pressure above the excavation face increases with excavation advancement during post-excavation; the earth pressure changes in deeper soil layers lags behind changes in shallow soil layers. (4)The pore water pressure reduces before they are stable during the construction advancement; pore pressure changes are closely related to excavation and dewatering. (5)The research in this paper has a reference value for the construction and design of the deep foundation pit of the shore immersed tube tunnel.

Key words： Key words: immersed tube tunnel deep foundation pit support axial forces pile moment earth pressure pore pressure

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2015/V32/I5/70

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