适用于河口淤泥质海域的海床基吸附力研究

Research of Absorption Force of Seabed Platform Applied in Estuarine Silty Waters

针对河口淤泥质海域,对影响海床基吸附力的两个主要因素——结构体浸没深度和结构体构造进行垂直对称起吊数值研究。研究表明:(1)海床基的最大吸附力随着海床基的浸没深度增大而显著增加,零淤积条件下最大吸附力为44.38 kN,浸深0.7 m即海床基完全浸没时最大吸附力可达88.92 kN;(2)海床基结构构造即底座直径、开孔数量和开孔直径对最大吸附力均有一定的影响,其中最大吸附力对底座直径极为敏感,两者近似有二元函数关系;随着开孔数的增加,最大吸附力逐渐减小,并且由开孔带来的吸附力降低效应随之降低;吸附力的降幅与开孔孔径成线性关系,随着孔径的增加,最大吸附力逐渐减小。该分析研究可为淤泥质海域海床基监测站位设计、回收绳索选择、结构布局、海上操作实施等方面提供可靠的技术指导。

Two main factors that affect the absorption force of seabed platform in estuarine silty waters were studied by numerical simulation, i.e. the seabed platform structure and immersion depth. Results show that： （1） As the growth of immersion depth of seabed platform, the maximum absorption force would increase accordingly, the maximum absorption force reach 44.38 kN when there＇s no immersion, while 88.92 kN with the immersion depth of 0.7 m; （2） The absorption force was influenced by the dimension of seabed platform, number of openings and the size of openings. Among these factors, especially the absorption force shows binary function relationship with the dimension of seabed platform. As the number of openings increase the maximum absorption force decreased gradually, but the trend decline as the number of openings increase. As the increase of the opening size, the decline of the maximum absorption force show linear relationship with the size. The research can be used in seabed platform structure design and actual operation, such as station position determination, recovery rope selection, structure design, offshore operation, to ensure the reliability of seabed platform monitoring in estuarine silty waters.