摘要
某海上风电基础地基表层土以软粘土为主,设计中采用抗倾覆好的筒形基础。对于海上风电基础,其持续长时间处于峰值较大的波浪荷载作用下,这种动荷载传到地基,可能造成软粘土地基的弱化,降低风机的稳定性,从而引起上部机构的失稳。为了分析该风电基础的稳定性,该文通过动三轴试验研究其地基土体在波浪荷载作用下的弱化效应,然后利用ABAQUS大型有限元分析软件,对考虑地基土体弱化前和弱化后的稳定性进行计算,计算结果表明考虑土体强度弱化的影响后,地基沉降明显增大,但仍然满足工程安全需要。
The topsoil of wind-electricity foundation on the sea is mainly soft clay,and the type of foundation used in its design process is cylindrical foundation.This foundation is always working under wave loads with peaking value.If the dynamic loads transfer to the foundation,it may weaken the soft foundation,and reduce the stability of fan,which would cause some instability problems of upper structure.In order to analyze the stability of wind-electricity foundation,the weakening effect in wave loads is studied through the dynamic triaxial test,then its stability is calculated before and after taking the weakening effect into consideration with ABAQUS large-scale finite element analysis software.The results show when the weakening effect is considered,the foundation settlement increases significantly,but it still meets the need of engineering safety.
出处
《勘察科学技术》
2011年第6期6-9,共4页
Site Investigation Science and Technology
关键词
软土地基
强度弱化
稳定性
风电基础
soft soil foundation
strength weakening
stability
wind-electricity foundation