Abstract In the recent years, the construction of urban infrastructure projects has developed rapidly. When the structure systems of these major infrastructures are subjected to various horizontal loads during operation, it may cause permanent lateral deformation of the pile and instability and damage of the foundation soil. Therefore, it is important to study the interaction of pile-soil system under horizontal load in the pile foundation design, which can provide reference for the design of pile foundation and guide for engineering practice. Based on Vesic expansion theory and according to the actual stress state of the surrounding soil during the horizontal displacement of the pile foundation, the formula of the soil resistance force on the pile side of compression zone are derived, the p-y curve model based on stress increment is established, and the applicability of the calculation method through examples verification are demonstrated in this paper. It is concluded through analysis that when the theoretical method proposed in this paper is applied to the calculation of mechanical response of the pile side soil under horizontal loads; the results of this method are in good agreement with the field measured data in model test, especially when a larger horizontal displacement the pile foundation has come up.

中文翻译：

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一种基于Vesic膨胀理论的py曲线方法

摘要 近年来，城市基础设施项目建设发展迅速。当这些重大基础设施的结构体系在运行过程中承受各种水平荷载时，可能会引起桩身永久侧向变形和地基土失稳破坏。因此，在桩基设计中研究水平荷载作用下的桩土相互作用具有重要意义，可为桩基设计提供参考和工程实践指导。基于Vesic膨胀理论，根据桩基水平位移过程中周围土体的实际应力状态，推导出受压区桩侧土体阻力计算公式，基于应力增量的py曲线模型成立，并通过实例验证了该计算方法的适用性。通过分析得出结论：将本文提出的理论方法应用于桩侧土在水平荷载作用下的力学响应计算；该方法的结果与模型试验现场实测数据吻合较好，尤其是在桩基出现较大水平位移时。