软黏土中伞式吸力锚基础水平承载有限元分析

发布时间：2018-12-16 18:48

【摘要】：伞式吸力锚基础(USAF)是传统吸力锚基础的改进型,其独特的结构型式在海洋岩土工程中具有更大的发展潜力。预先通过室内小尺度模型确定了USAF水平承载的位移控制标准,继而对软黏土中不同加载高度下USAF承载规律及地基土变形特性进行有限元分析,并对波浪循环荷载作用下的海床土应力折减效应进行了阐述。结果表明:随水平荷载加载高度升高,USAF的转动中心上移,海床土的应力扩散深度加深。"锚枝"和"筒裙"的增加使主筒侧壁土抗力发生应力重分布,锚前上部和锚后底端土体为USAF承载力的核心控制区。黏质海床超静孔隙水压力的累积对USAF土抗力的发挥影响显著,进而降低整个结构的水平承载能力。上述研究成果对完善USAF在海洋岩土工程中的应用具有重要意义。
[Abstract]:Umbrella suction anchor foundation (USAF) is an improved type of traditional suction anchor foundation, and its unique structure has greater development potential in marine geotechnical engineering. The displacement control standard of USAF horizontal bearing is determined by indoor small-scale model in advance, and then the USAF bearing law and the deformation characteristics of foundation soil under different loading heights in soft clay are analyzed by finite element method. The stress reduction effect of seabed soil under wave cyclic load is also discussed. The results show that with the increase of horizontal loading height, the rotation center of USAF moves up and the depth of stress diffusion of seabed soil deepens. " With the increase of anchor branch and cylinder skirt, the stress redistribution of the soil resistance of the lateral wall of the main tube occurs. The upper part of the anchor and the soil at the bottom of the anchor are the core control areas of the USAF bearing capacity. The accumulation of excess pore water pressure in the viscous seabed has a significant effect on the resistance of USAF soil, thus reducing the horizontal bearing capacity of the whole structure. The above research results are of great significance to improve the application of USAF in marine geotechnical engineering.
【作者单位】：中国海洋大学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;东南大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(No.41572247) 山东省科技攻关资助项目(No.2014GGX104007)~~
【分类号】：P75;TU470

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