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Post-preload undrained uniaxial capacities of skirted circular foundations in clay

机译：裙状圆形地基的预后不排水单轴承载力

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摘要

Improvement of the undrained capacities of foundation as a result of preloading, has received attention in offshore engineering only recently. It offers the benefit of optimising foundation design and reducing footprint and cost. This paper investigates the preloading performance of skirted circular foundations in clay using 3D coupled finite-element analyses. The increase in the ultimate undrained uniaxial vertical, horizontal and moment capacities is provided for non-dimensional groups of foundation skirt length, in situ undrained shear strength heterogeneity, magnitude of vertical preload and normalised consolidation time. An exponential relationship between preloading gain in capacity and normalised consolidation time is established, with the maximum preloading gain expressed as a function of the three other dimensionless groups. An approach to estimate the post-preload undrained ultimate uniaxial capacities of skirted circular foundations on normally consolidated clay is ultimately proposed. The influence of foundation geometry is discussed via comparison with the existing solutions.
机译：由于预紧而提高了地基不排水能力，直到最近才引起海上工程界的关注。它具有优化基础设计并减少占地面积和成本的优势。本文利用3D耦合有限元分析方法研究了裙状圆形地基在黏土中的预压性能。极限不排水单轴竖向，水平和弯矩承载力的增加为基础裙边长度，现场不排水抗剪强度非均质性，竖向预载大小和规范固结时间的无量纲提供了依据。建立了容量中的预加载增益与规范化合并时间之间的指数关系，最大预加载增益表示为其他三个无量纲组的函数。最终提出了一种方法来估计正常固结黏土上裙状圆形基础的预紧后不排水极限单轴承载力。通过与现有解决方案的比较，讨论了基础几何形状的影响。

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