波浪作用下考虑桩土相互作用的桩柱响应*

以一离岸深水桩柱为例,依据JTJ 2132—1998《海港水文规范》的环境条件和环境荷载规范,对桩柱进行有限元离散。在海洋深水环境条件下考虑流固耦合效应,计算了在海洋极端规则波以及不规则波条件下桩柱的运动响应;为了进一步研究分析泥面以下土体对桩柱运动响应的影响,对比分析了在考虑桩土耦合相互作用下桩柱的响应与基岩面固结解下的响应;考虑到海洋地基为两相饱和土介质,对比了在不同简化阻抗处理下的运动响应结果。结果表明,桩土耦合相互作用对于波浪尤其是不规则波作用下的桩柱响应有很大影响,简化阻抗下的运动响应相比两相饱和地基阻抗处理论误差在10%左右,考虑桩土耦合效应对于工程设计具有指导意义和实用价值。

Piles response under wave action considering pile-soil interaction

The dynamic response of the piles under extreme waves is investigated according to the Codes of Harbor Hydrology(JTJ 213—1998),we discrete the piles with FEM method and calculate the pile response considering the fluid-structure coupling effect in deep sea water environment.For further researching the pile-soil interaction,we carry out a comparative analysis with that under different pile-soil conditions.Results show that the pile-soil interaction has a great impact on the pile response in the open sea environment.The pile response under saturated soil has an error of 10% comparing with that under simplified impedence.