Canadian Geotechnical Journal, Ahead of Print.
This paper aims to analyze and describe the geotechnical behavior of a piled raft foundation of a tall building (53 floors, 172.4 m high) through the monitoring of strains in the building’s columns and piles, the stresses at the raft–soil interface, and the foundation settlements. Field and laboratory tests were performed, and associated with axisymmetric and three-dimensional finite element analysis to the assessment of the measured data. The monitoring of the pile strains suggests the occurrence of soil expansion, caused by the raft excavation process, up to approximately 6 months after the excavation was completed. The presence of different soil profiles under the raft, with different mechanical properties, affected the distribution of the foundation settlements and the pile loads. Initially, the average pile loads were concentrated in the perimeter elements, but, as the construction of the building evolved, they tended to become more uniform. The effect of the superstructure stiffness caused successive load redistributions in the columns, which contributed to the maintenance of the maximum angular distortion of the building within the allowable values and reduced the load difference between the piles positioned in opposite soil profiles.

中文翻译：

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基于柱、桩和筏-土界面长期监测的热带红土土中桩筏的岩土工程性能分析

加拿大岩土工程杂志，印刷前。
本文旨在通过监测建筑物柱和桩的应变、筏板-土界面处的应力以及高层建筑（53 层，高 172.4 m）的桩筏基础的岩土工程行为进行分析和描述。基础定居点。进行了现场和实验室测试，并结合轴对称和三维有限元分析来评估测量数据。对桩应变的监测表明，在开挖完成后约 6 个月内，筏式开挖过程引起了土壤膨胀。筏板下存在不同的土剖面，具有不同的力学特性，影响地基沉降和桩荷载的分布。最初，平均桩荷载集中在周边构件中，但随着建筑物结构的发展，它们趋于变得更加均匀。上部结构刚度的影响导致柱内连续荷载重新分布，这有助于将建筑物的最大角变形维持在允许值内，并减少位于相对土壤剖面的桩之间的荷载差异。