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首页> 外文期刊>Bulletin of earthquake engineering >Interaction of a pile with layered-soil under vertical excitations: field experiments versus numerical simulations
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Interaction of a pile with layered-soil under vertical excitations: field experiments versus numerical simulations

机译：垂直激发下分层土壤的相互作用：现场实验与数值模拟

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摘要

Data recorded during a field test involving an instrumented drilled shaft under vertical excitations are examined in order to (1) extract the soil-pile system's dynamic impedance, and (2) to evaluate the small-strain shear stiffness and material damping properties of the surrounding soil. Numerical simulations of steady-state vibration tests with an axisymmetric finite element model are used for back-calculating the in-situ small-strain dynamic soil properties (i.e., shear stiffness and material damping ratio). Also, a numerically computed impedance function is compared with known analytical solutions and that obtained through direct processing of the field test data. These analyses revealed that the discrete numerical model can successfully reproduce the measured responses of the shaft-soil system, and yield its frequency-dependent impedance function as well as equivalent small-strain dynamic soil properties. The validated numerical model presented here offers a detailed view of the vertical dynamic responses of drilled shafts within the small-strain range, and can be used for design and analysis of future field tests.
机译：涉及垂直激发下的仪表钻井轴的现场测试期间记录的数据是为了（1）提取土桩系统的动态阻抗，（2）评价周围的小应变剪切刚度和材料阻尼性能土壤。具有轴对称有限元模型的稳态振动试验的数值模拟用于背部计算原位小应变动态土壤性质（即剪切刚度和材料阻尼比）。此外，将数值计算的阻抗函数与已知的分析解决方案进行比较，并且通过直接处理现场测试数据而获得。这些分析显示，离散数值模型可以成功再现轴土体系的测量响应，并产生其频率依赖性阻抗功能以及等效的小菌株动态土壤性质。这里提出的经过验证的数值模型提供了钻孔轴的垂直动力响应在小型应变范围内的详细视图，可用于设计和分析未来的现场测试。

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