李大勇,王 梅,刘小丽

(1.山东科技大学山东省土木工程防灾减灾重点实验室,山东 青岛 266510;2.同济大学地下建筑与工程系,上海 200092)

离岸裙式吸力基础在砂土地基中沉贯性研究

李大勇1,王 梅2,刘小丽1

(1.山东科技大学山东省土木工程防灾减灾重点实验室,山东 青岛 266510;2.同济大学地下建筑与工程系,上海 200092)

吸力基础是海洋工程中新型的一种基础型式,广泛应用于海洋平台、海洋浮动式结构等,近年来,也被作为浅海离岸风力发电工程的基础。吸力基础易遭受较大的水平动力荷载和弯矩,从而可能产生较大水平位移和转角;同时,由于海床冲刷,会降低其承载能力。为克服这些不足,提出了一种新型吸力基础——裙式吸力基础,把分析传统吸力基础砂土中的沉贯方法,拓广到裙式吸力基础中,研究该基础型式在砂土中的可沉贯性以及所需的吸力;并与同情况下的传统吸力基础进行了比较,证明了所提出的裙式吸力基础具有较好的沉贯性能,具有工程实践推广价值。

裙式吸力基础;砂土地基;沉贯阻力;海洋工程

Abstract:Suction foundations are also referred to as suction anchors,suction pilesor suction caissons,and are conventionally used in offshore engineering to fix platform andmoor floating structures.Currently they act extensively as foundations for the offshorewind turbines in shallow sea water.Such a foundation is suffering from large lateral cyclic loading andmoment resulting in the excessive horizontal displacement and rotation.In addition,due to the erosion of seabed caused bywaves,the bearing capacity for the suction foundationwill be decreased.Tomitigate these disadvantages,a new typeof suction foundation named the skirted suction foundation ispresented in thispaper.Houlsby′sapproach to analyzing the installation of conventional suction anchors in sand isextended to the skirted suction foundation.The two stagesof the penetration of the skirted suction foundation consisting of self-weight induced and suction-induced are investigated.Compared with the installation of the conventional suction foundation depicted in the literature,it is shown that the skirted suction foundation hasa better behaviorof installation with lower costof construction and further time-saving.

Key words:skirted suction foundation;sand layer;penetration resistance;ocean engineering

随着全球能源危机、环境污染和温室效应日益加重,越来越多的国家重视开发可再生能源。由于海上风能资源丰富,海上风电工程具有零污染、零排放且没有视觉、噪音以及不占用陆地等优点,自世界上第一个海上风力发电厂1991年在丹麦建成,吸引了荷兰、英国、德国、意大利、瑞典和挪威等欧洲国家和美国等海洋国家的重视和大力发展海上风力发电工程[1]。……