裙式吸力基础水平承载数值分析  

Numerical analysis of lateral bearing behaviors of skirted suction caissons

作　　者：李大勇[1,2] 冯凌云[1,2] 郭彦雪[1,2] 曹立雪[1,2] 

机构地区：[1]山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木建筑学院,山东青岛266590

出　　处：《岩土工程学报》2013年第S1期33-38,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51078227);山东省自然科学基金项目(ZR2009FM003);教育部留学回国人员科研启动基金项目

摘　　要：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 skirted suction caisson consisting of a main structure and a skirted structure is a novel foundation.The lateral bearing behaviors of the skirted suction caisson in saturated sand are investigated by using the finite element method.The skirted suction caisson is subjected to lateral monotonic and cyclic loads,and the corresponding load-deformation curves are obtained.The relationships among deformation of foundations and various amplitudes and frequencies are examined.The results show that the lateral bearing capacity of the skirted suction caisson subjected to monotonic horizontal load increases by about 28.6%,and the deflection is effectively reduced to half of that compared to the conventional suction caisson.Under cyclic lateral load,the horizontal displacement of both types of foundations increases with the increase of the amplitude and frequency.However,the lateral displacement of the skirted suction caissons reduces by about 40% compared with that of the traditional suction caisson.Thus,the skirted suction caisson is very suitable to act as foundations of offshore wind turbines to work serviceably.

关 键 词：裙式吸力基础 承载力 有限元法 水平荷载 

分 类 号：TU470[建筑科学—结构工程]