水平荷载下饱和软黏土中裙式吸力基础承载特性

海上风力资源的开发目前是世界各国关注的能源热点问题。裙式吸力基础能有效提高基础的水平承载力及显著控制所产生的水平位移,非常适合作为海上风电塔架的基础。针对裙式吸力基础在饱和软黏土中的水平受荷情况,采用数值分析的方法,讨论了不同裙尺寸对裙式吸力基础的水平承载力、周围土体变形、转动点位置的影响。研究发现:裙式吸力基础水平承载力比传统吸力基础有显著提高,且随裙高和裙宽的增大而增大;对比传统吸力基础,裙式吸力基础达到极限承载力时,对周围土体的影响范围更大,然而沿加载方向基础前侧土体隆起量明显小于传统吸力基础;增大裙高,基础达到极限承载力时转动点沿基础埋深发生上移。研究成果对作为风电塔架的裙式吸力基础设计具有一定参考价值。

Bearing capacity of skirted suction caissons subjected to lateral loading in clay

Developing offshore wind energy becomes a hot issue in the energy field of the world. The skirted suction caisson (SSC) was proposed to increase the lateral control capacity and reduce the lateral deflection of the caisson, which is particularly suitable as the foundation of offshore wind power plant. The 3-D numerical simulations were carried out to study the lateral bearing capacity of the modified suction caisson in clay. The influence of dimension of the skirted structure on the lateral bearing capacity, soil deformation and rotation point were investigated. The results showed that the lateral bearing capacity of the SSC is greatly improved compared to the regular suction caisson (RSC), and its bearing capacity increases with the increasing of dimension of the skirted structure. When the ultimate load is reached, the influence range for the surrounding soil of SSC is larger than that of the RSC, and along the loading direction and in front of the foundation, the range of ground uplift is lower than that of the RSC. The rotation center of the SSC moves up with the increasing of the skirt depth.