大型沉管管节浮运的阻力计算及方案研究

发布时间：2018-01-10 18:21

本文关键词：大型沉管管节浮运的阻力计算及方案研究　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：沉管隧道工程是从上世纪初开始逐步发展起来的一种大型跨水交通工程,沉管隧道是由若干预制的管节,分别浮运到现场,一个接一个地沉放安装,在水下将其互相连接并正确定位在已经开挖的水下沟槽内,其后辅以相关工程施工,使这些管节组合体成为连接水体两端陆上交通的隧洞型交通运输载体。基于此,本文根据港珠澳大桥所属的海洋环境设计了相应的沉管隧道,为了将其托运至指定区域,设计了三种托运方案。同时需要计算每一种方案所需要克服的拖曳阻力,以便安排船舶。为此,本文分别采用《海上拖航指南》、《重力式码头设计与施工规范》和软件AQWA进行了计算,比较了三种的计算结果并选取了其中受到阻力最小方案作为后续计算的方案。同时研究了某一种托运方案中不同干舷值、不同拖航速度、不同波浪和水流方向等情况下拖航阻力的大小。通过对相应参数的研究,不难发现,干舷值对拖航阻力影响不大；拖航阻力与拖航速度基本成二次方关系,随着拖航相对速度的增加而增长很快；波浪阻力同波高也成二次方关系,而且受到拖航速度的影响；波浪与水流与拖航的角度也对拖航阻力有较大影响。并给出了一个海上拖航的推荐方案,可以供实际问题所借鉴。
[Abstract]:Sinking tunnel project is a kind of large-scale trans-water traffic project which has been developed gradually since the beginning of 0th century. The tunnel is made up of a number of prefabricated pipe sections, which are floated to the site and installed one by one. It is connected to each other under water and correctly positioned in the trench that has been excavated, followed by the construction of related projects. So that these pipe segments can be used as the tunnel transport carrier to connect the land traffic between the two ends of the water body. Based on this, this paper designs the corresponding immersed tunnel according to the marine environment of the HongKong-Zhuhai-Macao Bridge. In order to ship it to a designated area, three shipping schemes are designed. At the same time, it is necessary to calculate the drag resistance that each scheme needs to overcome in order to arrange the ship. For this reason, the "Maritime towing Guide" is adopted separately in this paper. The Code for Design and Construction of Gravity Wharf and the software AQWA are calculated. The results of three kinds of calculation are compared and the least resistance scheme is selected as the following calculation scheme. At the same time, different freeboard values and different towing speeds are studied in one kind of consignment scheme. Through the study of the corresponding parameters, it is not difficult to find that the freeboard value has little effect on the towing resistance. The relation between towing resistance and towing velocity is basically quadratic, and it increases rapidly with the increase of towing relative velocity. The wave resistance and wave height are also quadratic and affected by the towing velocity. The angle of wave, current and towing also has great influence on the drag of towing, and a recommended scheme of towing at sea is given, which can be used for reference in practice.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4;U459.5

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