摘要
基于Abaqus有限元软件建立海缆-斜滑断层三维数值模型,对斜滑断层作用下海缆各结构层局部屈曲失稳开展相应研究,分析斜滑断层下断层倾角、土体弹性模量和海缆埋设深度对临界屈曲位错的影响。结果表明:在斜滑断层作用下,海缆铠装钢丝位于断层面位置处会发生应力集中并随错动量增加向两侧扩散;各结构层变形具有一致性均呈S形,外被层、铠装钢丝和阻水铜导体按照从外到内位置顺序依次发生屈曲失稳;当断层倾角为90°时,海缆结构承受斜滑断层作用的能力最强;在硬质海床土体中海缆较易发生局部屈曲失稳;适当增加海缆埋深可增加海缆抵抗斜滑断层作用的能力。所得结果可为工程中海缆跨断层防护及局部屈曲判定提供参考。
A three-dimensional numerical model of the submarine cable-oblique slip fault is established based on Abaqus finite element software,and the corresponding research is carried out on the local buckling instability of various structural layers of the submarine cable under oblique slip fault.The influence of the fault dip angle,soil elastic modulus,and submarine cable burial depth on the critical buckling displacement under oblique slip fault is analyzed.The results indicate that:under the action of oblique slip fault,the stress concentration occurs in the armored steel wire of the submarine cables located at the fault plane and diffuses to both sides with increasing displacement;the deformation of each structural layer is consistent and shows an"S"shape,and the outer layer,armored steel wire,and copper conductor undergo buckling instability in the order from the outside to the inside;when the dip angle of the fault is 90°,the submarine cable structure is of the strongest ability to withstand the action of oblique sliding fault;the local buckling and instability of the submarine cables are more likely to occur in hard seabed soil;appropriately increasing the burial depth of the submarine cables can enhance their ability to resist the effects of oblique slip fault.The obtained results can provide reference for the protection of submarine cables crossing faults and the determination of local buckling in engineering.
作者
陈雷雷
彭昊
木朋
苏凯
CHEN Leilei;PENG Hao;MU Peng;SU Kai(Guangxi Guangtou Beibu Gulf Offshore Wind Power Generation Co.,Ltd.,Fangchenggang 538100,Guangxi,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;Zhejiang East China Engineering Consulting Co.,Ltd.,Hangzhou 311100,Zhejiang,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering(Ministry of Education),Wuhan University,Wuhan 430072,Hubei,China;Hubei Provincial Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,Hubei,China)
出处
《中国海洋平台》
2025年第6期69-75,共7页
China offshore Platform
关键词
斜滑断层
复合海缆
局部屈曲
有限元法
oblique slip fault
composite submarine cable
local buckling
Finite Element Method(FEM)
