Dynamic performance of submerged floating tunnel with different mooring styles subjected to anchor cable failure

Abstract

Submerged floating tunnels (SFTs) are novel structures for transportation across long- and deep-strait regions. Owing to severe wave and current excitation as well as the effects of underwater structures and corrosion, the risk of local anchor cable failure is high, which can result in the progressive failure of the entire structure. In this study, experimental and numerical investigations are conducted to analyze the dynamic behavior of an SFT with different mooring styles under local cable failure. A custom-designed cable failure device and the birth-and-death element method are used to simulate cable failure (i.e., progressive failure) via experiments and numerical simulation, respectively. A physical-scale segmental model of an SFT with different mooring styles under anchor cable failure is developed in this study. A segmental and entire-length mathematical model is developed using the ANSYS program to perform the numerical simulation. The results of the segmental numerical and experimental models indicate good agreement. The dynamic response of an SFT with different mooring styles under cable failure is comprehensively investigated by investigating the effects of key parameters (wave period, buoyant weight ratio, and cable failure mechanism). Moreover, the progressive failure of the SFT under cable failure is investigated via a segment model test and a numerical simulation of its entire length. The present study can serve as a reference for the safer designs of the SFT mooring style.

Graphical abstract

Keywords

dynamic behaviors / submerged floating tunnel / cable failure / mooring style / progressive failure

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant Nos. 52268061, 51808136, and 51878185), China Scholarship Council (No. 201906660001), Guangxi Science and Technology Base and Talent Special Funds (No. 2019AC20264), and Guangxi Natural Science Foundation (No. 2018JJB160058).

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Conflict of Interests

The authors declare that they have no conflict of interest.

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2023 The Author(s). This article is published with open access at link.springer.com and journal.hep.com.cn