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首页> 外文期刊>Journal of earthquake and tsunami >Soil-pile interaction during liquefaction-induced lateral spread
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Soil-pile interaction during liquefaction-induced lateral spread

机译：液化引起的横向扩散过程中的土-桩相互作用

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摘要

This paper describes a numerical model for the analysis of foundation piles subjected to large lateral ground deformation triggered by liquefaction. The model involves the use of p-y curves, but avoids the empiricism associated with the selection of degradation coefficients or reduction factors. To obtain a proper p-y characterization of the reaction between laterally deformed liquefied soil and an embedded pile, triaxial extension is recognized as the most appropriate analogue for the loading conditions. A suite of undrained triaxial extension tests was carried out using Nevada sand to establish the relevant strength and deformation parameters. Using the material parameters obtained from these tests, 2D FLAC analyses were performed to develop strain-softening p-y curves. Application of these p-y curves to the analyses of centrifuge experiments involving lateral spread effects on piles yields good agreement between the computed and measured responses. The strain-softening model provides excellent predictions of the measured peak and residual moments. Furthermore, the computed soil pressure diagrams agree well with the recommendations made by the Japan Road Association, which were calibrated using case histories from the 1995 Kobe earthquake. The same p-y curves were applied to the analysis of a field problem involving an actual pile foundation subjected to lateral spread effects during the 1964 Niigata earthquake.
机译：本文描述了一个数值模型，用于分析液化引起的大侧向地面变形的基础桩。该模型涉及使用p-y曲线，但避免了与选择退化系数或减少因子相关的经验主义。为了对横向变形的液化土壤和埋置桩之间的反应获得适当的p-y表征，三轴延伸被认为是最适合加载条件的类似物。使用内华达州砂进行了一系列不排水的三轴延伸试验，以建立相关的强度和变形参数。使用从这些测试中获得的材料参数，进行了2D FLAC分析，以生成应变软化p-y曲线。将这些p-y曲线应用于离心试验的分析中，该试验涉及对桩的横向扩展效应，可以在计算出的响应和测量的响应之间取得良好的一致性。应变软化模型可以很好地预测测得的峰值和残余力矩。此外，计算得出的土壤压力图与日本道路协会的建议非常吻合，该建议是使用1995年神户地震的案例历史记录进行校准的。相同的p-y曲线用于分析涉及1964年新泻地震期间受到侧向扩展效应的实际桩基的现场问题。

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