Bounding-surface-based p-y model for laterally loaded piles in undrained clay

Bounding-surface-based p-y model for laterally loaded piles in undrained clay
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不排水粘土中横向荷载桩基于边界面的 p-y 模型

DOI:
10.1016/j.oceaneng.2020.107997
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发表时间:
2020-11
期刊:
影响因子:
5
通讯作者:
Qi Wen Jorgin Tan
Qi Wen Jorgin Tan
中科院分区:
工程技术2区
文献类型:
--
作者:
Jian Yu;Junlin Zhu;Kanmin Shen;Maosong Huang;C.F. Leung;Qi Wen Jorgin Tan

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支撑大跨度桥梁、海上平台和海上风力发电机组的桩基经常受到风、浪和水流的反复横向荷载作用。为了预测循环荷载作用下桩侧阻力和累积侧向变形的退化,在边界面弹塑性理论的框架下,推导了不排水粘土中水平荷载作用下桩的理论循环p-y模型。不同于传统的基于循环次数和幅值来模拟桩侧阻力退化的p-y曲线,本研究采用边界面收缩来模拟水平循环荷载作用下土体阻力的软化过程。为了保证实用性,软化模型参数可以通过现场T-bar测试技术轻松地进行标定。在不同的桩头条件、桩土相对刚度和荷载幅值下进行了一系列的离心机试验验证。结果表明,该模型具有较好的预测桩侧阻力退化的能力。
Pile foundations supporting long-span bridges, offshore platforms and offshore wind turbines often suffer from repeated lateral loads due to wind, waves and currents. To predict the degradation of the pile's lateral resistance and cumulative lateral deformation through cyclic loading, a theoretical cyclic p-y model is derived for a laterally loaded pile in undrained clay, formulated within the framework of the bounding-surface elastoplastic theory. Unlike the conventional p-y curves which models the degradation of the pile's lateral resistance based on the cycle number and amplitude, bounding surface contraction is employed in this study to model the softening of the soil resistance during laterally cyclic loading. To ensure practicability, the softening model parameter can be easily calibrated by the in-situ T-bar testing technique. A series of verifications with centrifuge tests having various pile-head conditions, pile-soil relative stiffness and load amplitudes are performed. The good agreement demonstrates its ability to predict the degradation of pile lateral resistance.
正常固结粘土中单桩基础在循环横向荷载作用下的响应
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