Abstract Pile foundations are constructed using a variety of installation methods, which can significantly influence their behavior under axial loading. In this study, numerical simulations of a bored pile, a full-displacement pile and a full-displacement pile with attached expander body have been carried out using standard finite-element analysis where constitutive model parameters are estimated based on various geotechnical field measurements. Considering variations of in situ test measurements, conservative, best estimate and optimistic sets of the calibrated model parameters have been used for the subsurface soil. In order to capture the effect of pile installation method, different numerical strategies have been examined and their applicability to each of the installation methods evaluated. By studying the load-movement response and load distributions along the pile under head-down loading tests, results of the numerical simulations have been evaluated and compared to those obtained from a monitored field study. Finally, local and global sensitivity analyses, as well as a parameter identification procedure have been, respectively, used to find out the most contributing model parameters and to improve model predictions. Results of the numerical simulations signify the importance of a verified staged procedure for modeling the bored and full-displacement piles, as well as the expander body to best capture the pile bearing capacity and load-movement behavior. Furthermore, the parametric study undertaken reveals that acceptable predictions can only be achieved if the most contributing model parameters are identified and calibrated adequately.

中文翻译：

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轴向荷载下灌注桩数值模拟策略

摘要 桩基础的建造方式多种多样，在轴向荷载作用下，桩基的性能会受到显着影响。在这项研究中，使用标准有限元分析对钻孔桩、全位移桩和带有扩展器主体的全位移桩进行了数值模拟，其中本构模型参数基于各种岩土工程现场测量进行估计。考虑到现场测试测量的变化，对地下土壤使用了校准模型参数的保守、最佳估计和乐观集。为了捕捉桩安装方法的影响，研究了不同的数值策略，并评估了它们对每种安装方法的适用性。通过研究在低头载荷试验下沿桩的载荷-运动响应和载荷分布，对数值模拟的结果进行了评估，并与从监测的现场研究中获得的结果进行了比较。最后，局部和全局敏感性分析以及参数识别程序已分别用于找出最有贡献的模型参数并改进模型预测。数值模拟的结果表明了经过验证的分阶段程序对钻孔和全位移桩以及膨胀器主体建模的重要性，以最好地捕捉桩承载能力和负载移动行为。此外，