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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Optimal mooring configuration for tunnel element during immersion standby
Optimal mooring configuration for tunnel element during immersion standby
Author : Yue Song(1), Guoxing Huang*(1), Ningchuan Zhang(1), Yuguo Pei(2) ) & Yongxue Wang(1)
In South China, the Hong Kong-Zhuhai-Macau Link is constructed to connect Hong Kong, Zhuhai and Macau. The
traveling time from Hong Kong to Zhuhai or Macau will be reduced from 4.5 hours to approximately 40 minutes upon
completion. This mega infrastructure consists of three kinds of section: a man-made island, a bridge section as well as a
tunnel section crossing the offshore water of Ling Ding Yang, which is supposed to be the world longest and widest
immersed tunnel after completed. The dimensions of the largest element are of 180 m in length, 11.4 m in height and
72,000 tons weight in air. All tunnel elements are to be constructed in nearby yards on shore, towed to the immersion
location, and then moored on the sea surface above the trench on standby for immersion. During the standby stage, the
tunnel-pontoons system may expose to harsh offshore wave and weather conditions, and the mooring lines might
experience excessive tension or even breakage. Therefore, an experimental study was carried out on the hydrodynamic
responses of tunnel element during immersion standby under waves and currents. Based on Froude number similarity,
models of one tunnel element, two pontoons and the mooring system were constructed at a scale of 1:65. The tensions on
the mooring lines with various angles were measured under pure wave and combined wave-current conditions with
various wave heights and current velocities. After comparing the dynamic responses of the tunnel-pontoons system under
various mooring configuration, the optimal mooring configuration of the tunnel-pontoons system was recommended for
ensuring the safety of the tunnel element during immersion standby.
File Size : 479,400 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 20/08/2015
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