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Behavior of a Large Diameter Bored Pile in Drained and Undrained Conditions: Comparative Analysis

机译：排水和不推迟条件下大直径钻孔桩的行为：比较分析

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Despite the difficulties in obtaining the ultimate capacity of the large diameter bored piles (LDBP) using the in situ loading test, this method is the most recommended by several codes and design standards. However, several settlement-based approaches, alongside the conventional capacity-based design approach for LDBP, are proposed in the event of the impossibility of performing a pile-loading test during the design phase. With that in mind, natural clays usually involve some degree of over consolidation; there is considerable debate among the various approaches on how to represent the behavior of the overconsolidated (OC)stiff clay and its design parameters, whether drained or undrained, in the pile-load test problems. In this paper, field measurements of axial loaded to failure LDBP load test installed in OC stiff clay (Alzey Bridge Case Study, Germany) have been used to assess the quality of two numerical models established to simulate the pile behavior in both drained and undrained conditions. After calibration, the load transfer mechanism of the LDBP in both drained and undrained conditions has been explored. Results of the numerical analyses showed the main differences between the soil pile interaction in both drained and undrained conditions. Also, field measurements have been used to assess the ultimate pile capacity estimated using different methods.
机译：尽管使用原位加载测试获得大直径钻孔桩（LDBP）的最终容量，但该方法是多个代码和设计标准的推荐。然而，如果在设计阶段在设计阶段进行桩加载试验，则提出了几种基于常规的基于容量的设计方法的解决方法。考虑到这一点，天然粘土通常涉及一定程度的整合;关于如何代表过分源性（oc）粘土及其设计参数的各种方法之间存在相当大的辩论，无论是排水还是未经释放的，在桩载试验问题中。在本文中，已用于在OC克莱（Alzey Bridge Case Shogion，Germany）中安装的轴向装载到失效LDBP负载试验的现场测量，用于评估建立的两个数值模型的质量，以模拟排水和不推迟的条件下的桩行为。校准后，已经探讨了LDBP在排水和未经涉及的条件下的负载转移机制。数值分析的结果表明，排水和不推迟条件下的土桩相互作用之间的主要差异。此外，已经使用现场测量来评估使用不同方法估计的最终桩容量。

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