海上桩基冲刷机理及防护措施研究

为深入研究波流作用对桩基冲刷的影响，本文基于经典静水压力理论，采用Telemac数值模拟软件，将流场与涡量的数值模拟结果与前人实验成果进行对比，在验证无误后，根据设计工况对桩周流场、涡量与冲刷特征进行模拟分析，同时针对冲刷结果提出仿生水草和底栖生物组合的防护方法，并开展相应的物理模型实验，证明了仿生水草和底栖生物组合具有优良的缓流促淤作用，揭示了桩基在不同波流作用下的冲刷机理。结果表明:随着波浪作用的加入与流速的增大，桩基左右两侧流速显著提高;涡量分布对水流作用强度变化更加敏感;最大冲刷深度均出现在桩基左右两侧及四桩心矩形连线内，且四根桩基冲刷深度差异不大;柔性防护措施具有优良的缓流促淤作用。

英文摘要:

To deeply investigate the impact of wave-current interactions on the scour around pile foundations, this study is based on the classical hydrostatic pressure theory and employs the TELEMAC numerical simulation software. The numerical simulation results of the flow field and vorticity are compared with previous experimental results for validation. After validation, the study simulates and analyzes the flow field, vorticity, and scour characteristics around the piles under different design conditions. Additionally, a protective method combining bionic seaweed and benthic organisms is proposed based on the scour results, and corresponding physical model experiments were carried out to prove that the combination of bionic aquatic plants and benthic organisms has excellent flow retardation and sedimentation promotion effect. The research elucidates the scour mechanisms of pile foundations under various wave-current interactions. The results indicate that: The flow velocity on both sides of the pile foundation significantly increases with the addition of wave action and the increase in current velocity; The distribution of vorticity is more sensitive to changes in the intensity of water flow; The maximum scour depth occurs on both sides of the pile foundation and within the rectangular area connecting the centers of the four piles, with minimal differences in scour depth among the four piles; Flexible protective measures exhibit excellent flow-reducing and sediment-promoting effects.

查看全文查看/发表评论下载PDF阅读器