海上风力发电伞式吸力锚基础承载规律试验分析

发布时间：2018-01-23 23:31

本文关键词： 海床波浪黄河三角洲吸力锚承载特性地基变形　出处：《水利学报》2015年12期 　论文类型：期刊论文

【摘要】：为了考察新型海洋伞式吸力锚基础(USAF)在不同载荷环境下的工作特性,通过室内土箱试验设计了3种加载方案:水平静力加载、水平循环加载和静力抗拔试验,在黏质粉土模拟海床中较系统的研究了海洋USAF基础的承载特性和锚土相互作用规律。水平静力加载试验中重点分析了分级加载后锚体荷载位移变化规律,绘制了荷载位移归一化曲线用来判别锚体正常工作状态下的极限水平承载力。水平循环加载下,拟合了土体塑性累积变形与循环周次的关系式,模拟了USAF在波浪低频荷载和一次风暴潮作用后的锚体变位响应。静力抗拔试验中,发现并阐述了锚体在上拔过程中的"分段现象",运用动力学原理建立了一种确定USAF基础最大抗拔荷载的搜索方法,并比较了锚体上拔过程中上拔加速度,主筒负压值与上拔荷载的关系,试验结果对USAF基础的工程具有指导意义。
[Abstract]:In order to investigate the working characteristics of a new marine umbrella suction anchor foundation USAF under different loading conditions, three loading schemes were designed through indoor soil tank test: horizontal static loading. Horizontal cyclic loading and static pull-out test. The load-bearing characteristics of marine USAF foundation and the law of interaction between anchor and soil are systematically studied in the clay silt simulation seabed. In the horizontal static loading test, the variation law of load displacement of anchor body is analyzed emphatically. The load-displacement normalization curve is drawn to judge the ultimate horizontal bearing capacity of anchor body under normal working condition. Under horizontal cyclic loading, the relationship between soil plastic cumulative deformation and cyclic cycles is fitted. The displacement response of USAF under low frequency wave load and a storm surge is simulated. In the static pull-out test, the "segmental phenomenon" of the anchor in the process of uplift is found and expounded. A search method for determining the maximum uplift load of USAF foundation is established by using the dynamic principle, and the relationship between the uplift acceleration, the negative pressure value of the main cylinder and the uplift load during the uplift process of the anchor is compared. The test results are of guiding significance to the engineering of USAF foundation.
【作者单位】：东南大学岩土工程研究所;海洋环境与生态教育部重点实验室;中国海洋大学环境科学与工程学院;
【基金】：国家自然科学基金项目(41572247,51279032) 山东省科技攻关项目资助(2014GGX104007)
【分类号】：TM614;TU476
【正文快照】： 1研究背景吸力锚基础作为一种新型的水利与海洋工程基础型式,以其安装方便,造价低廉和可重复利用等优点,在各类海洋基础工程建设中具有良好的应用前景。我国海上风能资源丰富[1],特别是近些年来,随着国际海洋能源战略开发力度的加强,吸力锚基础开始广泛用作海洋石油平台锚固和

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