固定方式对桩柱式围网网片波浪力学特性影响研究  

Study of effect on wave mechanical properties for net panel of pile-column type net enclosure by fixations

作　　者：桂福坤 陈天华 赵云鹏[2] 董国海[2] 

机构地区：[1]浙江海洋大学国家海洋设施养殖工程技术研究中心,浙江舟山316022 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》2017年第3期285-292,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51239002);国家海洋局公益性行业科研专项经费资助项目(201505025-2);舟山市海洋专项(2015C41001)

摘　　要：浅海围网养殖是新兴的一种生态型养殖模式,其中比较典型的桩柱式围网,主体由排桩和网片组成.围网网衣系统安全是决定围网养殖工程安全的关键所在,因此针对桩柱式围网中的单元网片,采用数值方法对其在波浪作用下的力学特性进行了研究,着重分析了不同网片尺度和固定方式下单元网片的网线张力分布、结节偏移和桩柱系缚点受力特性.结果表明,波浪条件下桩柱式围网单元网片的网线最大张力主要出现在网片上端两侧位置,网线最大张力与网片尺寸成正比;单元网片结节最大偏移主要出现在网片的中上位置,同样结节最大偏移与网片尺寸成正比.两者均随系缚点数量的增加先减小后在系缚点多于4个时趋于稳定;网片与桩柱的系缚点最大受力出现在上端点,其次是下端点,且数值上均远远大于桩柱中间的系缚点,并随网片尺寸的增大而增大,随系缚点数量的增加而不断减小.The net enclosure aquaculture（NEA）in shallow water is a new developing ecological aquaculture mode.The pile-column type net enclosure is one of the most typical structures,which is mainly composed of piles and net panels.The net system is the most important part which affects the security of the whole NEA system,therefore the mechanical performance of unit net panels under different wave conditions is investigated using numerical method.The effects of net panel size and fixations on the tension force in twines,offset of nodes and loads at fixing points are studied.The experimental results show that the maximum twine force occurs mainly at the upper two sides of the unit net panel and increases as the size of net panel increases.The maximum node offset appears at the mid-upper part of net panel and also increases with the increase of the size of net panel.Both of the maximum twine force and the maximum node offset decrease as the fixing points number increases.However,they show little change when the number of the fixing points is over four.Regarding of the force at the fixing points,the largest force appears at the upper,then the bottom fixing points,and they are much higher than those at the other fixing points.The force increases with the increase of the size of net panel,and decreases with the increase of the fixing points number.

关 键 词：桩柱式围网养殖 单元网片 数值模拟 固定方式 波浪 

分 类 号：S955.9[农业科学—水产养殖]