Experimental investigation on live-bed scour development and protection of J-tube submarine cable

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL Marine Structures Pub Date : 2025-03-14 DOI:10.1016/j.marstruc.2025.103807

Yangyang Gao , Peiyuan Zhou , Lizhong Wang , Lingzhi Jiang , Haojun Yang

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Abstract

A series of experiments were conducted to investigate the live-bed scour development and protection of J-tube submarine cable under the current-only and current-wave conditions. The local scour development and final equilibrium scour depth around the monopile foundation and submarine cable under different wave and current conditions were analyzed. The results show that the maximum scour depth of the scour pit around the monopile increases with the increase of flow velocity and decrease of wave height. Under different current-wave conditions, the maximum scour depth of monopile on the side of J-tube cable is more than 10 % of that on the other side. Different protection methods including riprap protection, different bionic grasses protection and combination protections were examined. The dynamic response of J-tube submarine cable was investigated with different protection methods. The results show that the bionic grass can promote sediment deposition in the protection zone, reduce the suspended length of submarine cable. The concrete mattress can significantly reduce the motion amplitude of suspended submarine cable. The combined riprap-bionic grass 3-concrete mattress protection can reduce the local scour by 96.5 % and submarine cable motion amplitude by more than 80 % under current-wave conditions.

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j管海底电缆活床冲刷发展及防护试验研究

对j管海底电缆在纯流和流波两种工况下的活床冲刷发展及防护进行了试验研究。分析了不同波浪和水流条件下单桩基础和海底电缆周围的局部冲刷发展和最终平衡冲刷深度。结果表明：单桩周围冲刷坑的最大冲刷深度随着流速的增大和波高的减小而增大；在不同的电流波条件下，j型管电缆一侧单桩最大冲刷深度大于另一侧单桩最大冲刷深度的10%以上。研究了抛石防护、不同仿生草防护和组合防护等不同防护方法。采用不同的保护方法对j型管海底电缆的动力响应进行了研究。结果表明，仿生草能促进保护区内沉积物的沉积，减少海底电缆的悬吊长度。混凝土垫层可以显著降低悬空海底电缆的运动幅值。在流波条件下，抛石-仿生草-混凝土复合保护层可使海底电缆局部冲刷减少96.5%，运动幅度减少80%以上。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.