水平荷载作用下裙式吸力基础承载性能研究

Bearing capacity of skirted suction caisson in sand under horizontal monotonic/cyclic loading

传统吸力基础是一个单桶结构,被广泛作为海洋平台、漂浮结构的基础,近年来也被推广到海上风电塔架。作为风电塔架基础,要充分提高其水平承载能力。为此,提出一种改进的基础形式—裙式吸力基础。采用Z_SOIL有限元软件,针对砂土地基,从水平单调加载和循环加载两个方面,对传统单桶吸力基础和裙式吸力基础进行了承载性能对比研究,得到了相应的荷载-位移曲线。研究结果表明,裙式吸力基础由于设置了"裙"结构,显著提高了其抵抗水平静载和循环水平动力荷载的能力,并能有效控制基础的水平位移,是值得推广应用的一种新型海洋工程基础形式。

Traditional suction caisson is an upside down bucket-shaped structure,which is widely used as an alternative to support offshore platforms and mooring floating structures.It currently acts extensively as the foundation of offshore wind turbines.Its lateral bearing capacity plays an important role in the design.To increase the lateral bearing capacity,a new type of suction caisson,the skirted suction caisson,is presented.The skirted suction caisson in sand is investigated in comparison with the traditional suction caisson by using the finite element method under the monotonic and cyclic loading.The corresponding load-deformation curves are obtained.The results show that the horizontal bearing capacity is significantly enhanced to resist the static and cyclic loads due to the additional structure of the skirt.