安装效应对砂土中水平循环受荷桩承载特性影响研究 English Version
The influence of installation effects on the bearing characteristics of piles under lateral cyclic loading in sand
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摘要: 桩的打入过程显著影响桩周土体的应力场和位移场，而传统分析中通常没有考虑。深入研究桩安装效应对海上风电桩基水平循环承载特性的影响尤为重要。本文首先建立了可以反映砂土剪胀行为及循环弱化特性的状态相关摩尔-库伦本构模型，并结合耦合欧拉-拉格朗日法（CEL）进行了桩贯入的三维有限元数值模拟，获得了打入桩引起的桩周土体应力场分布。随后分别在数值模型中采用原位应力场及导入打入桩桩周土体应力场，进一步开展了水平循环受荷桩数值试验，并考虑不同桩身弹性模量、水平循环荷载次数及幅值，对比分析了两种情况下水平循环受荷桩承载特性及桩周土受力响应。研究结果表明，循环次数及幅值一定的情况下，安装效应削弱了水平循环受荷桩桩顶位移累积行为，提高了桩基的水平承载能力。本文的研究结果可为桩基设计中的材料选择、安装效应的考虑及荷载作用分析提供依据。
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关键词:
- 有限元模拟 /
- 水平受荷桩 /
- 循环荷载 /
- 安装效应 /
- 状态相关摩尔-库伦本构
Abstract: The displacement pile installation process significantly affects the stress and strain fields in the surrounding soils, which is often neglected for simplicity in conventional analysis and design. It is crucial to investigate the pile installation effects on the bearing characteristics of offshore wind turbine piles subjected to lateral cyclic loading. In this paper, a state dependent Mohr-Coulomb constitutive model is introduced first to describe the dilatancy and cyclic degradation of sand. The model is then incorporated into the Eulerian-Lagrangian method (CEL) of a three-dimensional finite element to simulate the pile penetration process and obtain the stress field developed in the sand mass during the installation. Two simulation scenarios are considered in the numerical model: one with in-situ stress field (pile introduced as wished-in-place) and the other with the stress field resulting from the pile installation. Lateral cyclic loaded pile tests are conducted on the model, considering varying pile shaft elastic moduli, lateral cyclic load cycles, and amplitudes. A comparative analysis is performed to evaluate the bearing characteristics of cyclic loaded piles and the response of the surrounding soil in both cases. The results show that, for a given number of cycles and amplitudes, the installation effect reduces the cumulative displacements at the pile head under lateral cyclic loading, while increasing the lateral bearing capacity of the pile. The findings of this study provide valuable guidance for offshore pile design, particularly in considering installation effects, material selection and load analysis. -
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