基于流函数理论的波浪荷载作用下的自由海床动力响应

发布时间：2018-05-23 13:00

本文选题：流函数波浪理论 + 波浪作用　；参考：《北京工业大学》2014年硕士论文

【摘要】：所有海洋工程建设都必须在牢固的基础上完成，海洋工程地基埋于海洋土环境中，海洋土层为多孔多相介质，浅层海浪和深层洋流是常态情况。为了合理模拟实际海洋中波浪及场地中土体的受力及变形特性，本文采用了数值模拟的方法，主要研究工作和成果如下： (1)介绍了流函数波浪理论，将流函数波浪理论计算得到的部分结果与线性波理论计算得到的相关结果进行了对比，计算结果表明了流函数理论可以很好的考虑波浪的非线性；初步探讨流函数波浪理论在考虑洋流作用方面的优势；推导了流函数波浪在海底的随时空分布的波压力公式，并使用其来模拟波浪荷载； (2)将海床场地看做流体饱和两相多孔介质，基于流体饱和两相多孔介质的弹性波动方程组，运用显式逐步积分格式与局部透射人工边界相结合的时域显式有限元方法，计算和对比分析了海床在线性波浪荷载和流函数波浪荷载作用下的动力响应； (3)基于流函数理论计算了波浪引起的动水压力，并联合考虑了地震引起的动水压力，分析动水压力对土性的影响，基于NERA软件，依托港珠澳大桥建设场地的实例，探讨了场地在地震和波浪联合作用下的动力响应。
[Abstract]:All marine engineering construction must be completed on a solid basis. The foundation of ocean engineering is buried in the marine soil environment, the ocean layer is porous and multiphase medium, and the shallow wave and deep ocean current are the normal conditions. In order to simulate the force and deformation characteristics of wave and soil in the real ocean reasonably, the numerical simulation method is used in this paper. The main research work and results are as follows: 1) the wave theory of current function is introduced, and some results obtained by wave theory of current function are compared with those obtained by linear wave theory. The results show that the theory of current function can take into account the nonlinearity of wave. This paper discusses the advantages of wave theory of current function in considering the action of ocean currents, deduces the wave pressure formula of wave distribution at any time in the sea floor, and uses it to simulate wave loads. The seabed site is regarded as a fluid-saturated two-phase porous medium. Based on the elastic wave equations of fluid-saturated two-phase porous media, a time-domain explicit finite element method combining the explicit stepwise integral scheme and the local transmission artificial boundary is used. The dynamic response of the seabed under the action of linear wave load and current function wave load is calculated and compared. 3) based on the theory of current function, the dynamic water pressure caused by waves is calculated, and the dynamic water pressure caused by earthquake is considered jointly, and the influence of dynamic water pressure on soil property is analyzed. Based on NERA software, the construction site of Hong Kong-Zhuhai-Macao Bridge is used as an example. The dynamic response of the site under the combined action of earthquake and wave is discussed.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P731.22;P75

【参考文献】