波浪荷载作用下风机桩基础与土相互作用分析

来源期刊：中南大学学报(自然科学版)2018年第8期

论文作者：胡安峰 付鹏 涂强 南博文 谢康和

文章页码：2009 - 2016

关键词：波浪荷载；海上风机；桩基础；水平位移；超静孔压

Key words：wave load; offshore wind turbine; monopile; lateral displacement; excess pore pressure

摘    要：采用三维数值分析方法，建立考虑流固耦合的三维桩-土模型；同时考虑波浪作用在桩上的水平荷载和波浪对海床的直接作用，研究2种形式的波浪荷载耦合作用下海上风机桩基础与土相互作用；根据数值模拟结果，研究2种荷载耦合作用下海上风机桩基础的变形与内力分布、桩侧土体超静孔压及桩土界面接触应力的变化规律，探讨不同波浪参数对单桩基础性状的影响，并与只考虑桩受荷时的计算结果进行对比分析。研究结果表明：当考虑波浪对海床的作用时，桩身将产生附加水平位移，同时也会引起桩侧土体超静孔压和桩土界面接触应力的循环变化。

Abstract: A 3D finite element model considering fluid-soil coupling for monopile foundation of offshore wind turbine was proposed to study the interactive behavior of pile and soil under wave load. Effects of waves on both pile and seabed were considered in this model. Based on simulation results, deformation and internal force of monopile were investigated. Moreover, response of pore pressure within soil around pile and contact stress of the interface between pile and soil were discussed. The effects of wave height and water depth on monopile behavior were studied, and the model considering only the lateral load on pile was compared with the model considering the coupling effect of wave load. The results show that there is additional lateral displacement of monopile when considering the coupling effects of wave load. Furthermore, pore pressure within soil around pile and contact stress of the interface between pile and soil display cyclic variations with time.