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浅水区波浪非线性效应对砂质海床动力响应的影响
引用本文:王忠涛,栾茂田,刘占阁,王栋.浅水区波浪非线性效应对砂质海床动力响应的影响[J].海洋工程,2005,23(1):41-46.
作者姓名:王忠涛  栾茂田  刘占阁  王栋
作者单位:1. 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;大连理工大学,土木水利学院岩土工程研究所,辽宁,大连,116024
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;大连理工大学,土木水利学院岩土工程研究所,辽宁,大连,116024;中国科学院,武汉岩土力学研究所,湖北,武汉,430071
基金项目:国家自然科学基金资助项目(50179006),教育部跨世纪优秀人才培养计划研究基金资助项目,中国科学院武汉岩土力学研究所领域前沿基础研究基金资助项目
摘    要:以广义Biot动力固结理论为基础,运用一阶椭圆余弦波和二阶Stokes波等非线性波浪理论考虑浅水区波浪荷载的非线性效应,在时域上采用有限元方法对非线性波浪力作用下饱和砂质海床的动力响应进行了数值求解,并与线性波浪作用下海床动力响应特性进行了对比分析。结果表明,随着波长与水深之比L/d及无量纲参数T(g/d)^1/2的增大,非线性波浪对海床动力响应的影响增大。与线性波浪理论相比,孔隙水压力与有效应力幅值的增大效应非常显著。因此在近海海洋建筑物设计与工程场地评价中,波浪力的非线性特性必须引起注意。

关 键 词:非线性波  海床  有限元  固结理论  孔隙水压力  有效应力
文章编号:1005-9865(2005)01-0041-06
修稿时间:2004年5月10日

Studies on the effect of non-linear wave loading in shallow water region on dynamic response of sandy seabed
WANG Zhong-tao.Studies on the effect of non-linear wave loading in shallow water region on dynamic response of sandy seabed[J].Ocean Engineering,2005,23(1):41-46.
Authors:WANG Zhong-tao
Institution:WANG Zhong-tao~
Abstract:In this study, numerical analyses for solving the generalized Biot's dynamic consolidation equations by virtue of finite element method are performed on dynamic response of sandy seabed subjected to non-linear wave loading in the shallow water region. The seabed is modeled as poro-elastic media and the non-linear wave loading is represented by second-order Stokes'wave theory and first-order cnoidal-wave theory. Numerical results are given for comparative studies. Compared with the numerical results from the linear wave theory, the amplitudes of both pore water pressure and effective pressure computed from the non-linear wave theories increase. It is shown that the linear theory of wave usually under-evaluates the dynamic response of seabed in the shallow water region. Therefore, the effect of non-linear characteristics of wave loading should be taken into consideration in planning and design of various near-shore or offshore constructions and facilities and in evaluation of engineering sites.
Keywords:non-linear wave  seabed  finite elements  consolidation theory  pore water pressure  effective pressure
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