海底沉管隧道管段海上系泊方式研究

The Mooring Method of Subsea Immersed Tunnel Elements

海底沉管隧道管段海上系泊阶段的结构运动响应及布缆方式,直接影响其水上施工的安全性和经济性。针对某沉管隧道管段系泊工程,文章利用基于三维势流理论的水动力软件AQWA建立管段海上系泊仿真模型,分别对五种不同的系泊方式进行时,频域分析,探讨了布缆方式对沉管管段运动响应及缆索受力的影响。结果表明:管段在高频区域内稳定性较好,响应幅值很小;四缆系泊方式在实际工程中不可采用;八缆系泊方式较安全;在海况较好的情况下,可以采用更加经济的六缆系泊方案。

The safety and economic benefit of offshore construction are affected by the motion response of subsea immersed tunnel elements and arrangement of mooring lines in the sea. Aimed at a mooring project of an immersed tunnel element, a simulation model is established by hydrodynamics simulation software AQWA based on 3D poten- tial flow theory, by which it analyzes the time/frequency domain regarding the five different mooring methods, dis- cusses the effects of the mooring line arrangements on the motion responses of the tunnel element and the forcing be- haviours on mooring lines. The results show that the stability of the immersed tunnel element is good with a small re- sponse amplitude when the elements are in the high-frequency region; four-mooring lines should not be used in practical engineering; and the eight-mooring line method is safe. In good conditions at sea, six-mooring lines may be a good choice because of their economic advantages.