【作者】 王智辉；

【导师】 王义刚；

【作者基本信息】 河海大学 ， 港口、海岸及近海工程， 2005， 硕士

【摘要】 桩基码头是港口工程中最常用的码头结构形式之一，应用极其广泛。由于桩基所在的区域水流结构的特殊性，目前理论上研究尚少，时间上通常采用物理模型实验或数值模拟来了解桩基码头前沿的水流情况。由于模型实验范围一般很大，物理模型往往都采用变态模型，而数值模拟则由于尚无合适的数学模型，因此，目前在这两种模型中，通常都将桩基码头简化为直立岸壁，通过模拟来预演工程实施后流态改变的情况。此种概化方法不能反映桩基对水流的影响，无法交好地描述桩基码头前沿真实的水流情况。 桩群的水流阻力比单桩的水流阻力要复杂的多，理论上解决桩群水流阻力目前还比较困难。因此，本研究采用局部物理模型实验的方法进行研究，通过分析研究，提出在桩基涉水建筑物数学模型中考虑群桩影响的计算方法。并给出了在数值模拟控制方程中如何考虑加入群桩阻力项。 本文从水流的基本控制方程出发，对经典的N～S方程进行应用，引入阻力项以更好的反映群桩阻力对水流的影响。对于阻力系数的确定，本文采用水槽物理模型试验获得相应的群桩阻力系数曲线，并将得出的结论应用于数学模型中对几个工程实例进行数值模拟，结果表明这种方法能够较好的反映实际情况，为今后群桩数值模拟提供了一定的参考。更多还原

【Abstract】 Pile jetty is one of the most normal structure of harbor engineering. Due to the peculiarity of the current flow in the district, there is lack of study in theory , physical model and numerical model are used to simulate the current condition on the front of jetty. For the domain in model experiment is very large, distort model is often used in physical model, while there is no proper numerical model in numerical simulation up to now, the pile jetty is usually simplified as erecting wall in these models to forecast the change of current due to construction by simulating. This simplified method could not reflect the influence of the piles on current and could not describe the real current condition on the front of jetty.Because the condition of current drag force of group piles is more complex than that of single pile, it is difficult to solve the problem in theory. In the paper, local physical model experiment is carried out as the research method and at last the calculation method is put up for considering the influence by group piles in numerical simulation for pile-foundation building and the drag force term in the numerical simulation controlling equation is also developed .On the base of current basic controlling equation, N-S equations are amended by introducing drag term . In determine the coefficient of drag, the group piles drag coefficient curves are obtained through channel experiment and the conclusion is put into numerical model for simulating several engineering condition . The result is shown that this method could reflect the real condition better and provide reference for later group piles numerical simulation.更多还原