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裙式吸力基础是传统吸力基础的改进形式,即在原有桶形结构基础上增加了“裙”结构。采用有限元方法,对饱和砂土地基中传统吸力基础和裙式吸力基础分别进行水平单调加载和循环加载承载性能研究,分析了基础、土体的变形,得到了荷载-位移关系曲线以及基础位移随荷载振幅、频率变化的关系曲线。数值分析结果表明,与传统吸力基础比较,裙式吸力基础在单调荷载作用下的水平承载力提高约28.6%,同时基础的侧移量显著减小,约为传统吸力基础位移的50%;在循环荷载作用下,两种基础的水平位移均随振幅及频率的增加而增大,但裙式吸力基础水平位移量减少约40%。因此,裙式吸力基础更适合作为以水平荷载为主的结构的基础,例如海上风电工程,更能满足上部结构正常工作状态需求。
The foundation of the skirt suction is an improved form of the traditional suction foundation, that is, the “skirt” structure is added to the original barrel structure. The finite element method is used to study the horizontal monotonic loading and cyclic loading behavior of traditional suction foundation and skirt suction foundation in saturated sand foundation respectively. The deformation of foundation and soil is analyzed. The load-displacement curve and the basic displacement With the load amplitude, the frequency of the curve. The results of numerical analysis show that compared with the traditional suction foundation, the horizontal suction capacity of the skirt suction foundation increases about 28.6% under the monotonic load and the lateral displacement of the foundation decreases significantly, which is about 50% of that of the traditional suction foundation. Under cyclic loading, the horizontal displacement of the two kinds of foundation increases with the increase of amplitude and frequency, but the horizontal displacement of the skirt suction foundation is reduced by about 40%. Therefore, the foundation of skirt suction is more suitable as a basis for horizontal load-based structures, such as offshore wind power projects, to better meet the needs of the normal operation of the superstructure.