双向循环荷载下的单桩基础累积侧向位移

doi:10.16183/j.cnki.jsjtu.2020.01.011

摘要/Abstract

摘要： 针对软黏土地基中单桩基础在竖向和水平循环荷载下的累积侧向变形问题，建立基于双向循环受荷的软黏土刚度衰减模型.利用有限元软件Abaqus进行二次开发实现刚度衰减，通过数值模拟分析竖向和水平循环荷载耦合作用下单桩基础的累积侧向位移.结果表明，水平和竖向循环荷载耦合作用下，桩顶侧向位移相比于只受水平循环荷载时更大；存在最小水平循环荷载比，当水平循环荷载比小于该值时，桩基不会产生侧向位移累积；竖向循环荷载对桩基累积侧向变形的影响存在一临界值，小于该值时，对桩顶侧向位移的影响很小.

关键词: 双向循环荷载；单桩基础；侧向位移；刚度衰减；循环荷载比

Abstract: The stiffness degradation model of soft clay based on bidirectional cyclic loadings was presented to analyze the cumulative lateral displacement of single pile foundation under lateral and vertical cyclic loadings. The finite element software Abaqus was used to realize the stiffness degradation by secondary development method and study cumulative lateral displacement of single pile foundation under lateral and vertical cyclic loadings. Results indicate that under vertical and lateral cyclic loadings, lateral displacement at single pile head is larger than that only under horizontal cyclic loading. Minimum horizontal cyclic loading ratio is found under the analysis. When the horizontal cyclic loading ratio is smaller than the minimum, lateral displacement cannot cumulate in single pile foundation. There is a critical value of vertical cyclic loading in terms of its influence on pile lateral deformation. Lateral displacement of pile cannot be seriously affected by vertical cyclic loading when it is below that critical value.

Key words: bidirectional cyclic loadings; single pile; lateral displacement; stiffness degradation; cyclic loading ratio

中图分类号:

TU 473

胡安峰，肖志荣，江进华，付鹏，南博文. 双向循环荷载下的单桩基础累积侧向位移[J]. 上海交通大学学报, 2020, 54(1): 85-91.

HU Anfeng,XIAO Zhirong,JIANG Jinhua,FU Peng,NAN Bowen. Cumulative Lateral Displacement of Single Pile Foundation Under Lateral and Vertical Cyclic Loadings[J]. Journal of Shanghai Jiaotong University, 2020, 54(1): 85-91.

参考文献

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