基于非线性运动硬化模型的饱和黏土桩基础竖向循环弱化数值分析

黄茂松; 刘莹

doi:10.11779/CJGE201412003

基于非线性运动硬化模型的饱和黏土桩基础竖向循环弱化数值分析 English Version

黄茂松^{1, 2},
刘莹^{1, 2, 3}

1. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 2. 同济大学地下建筑与工程系,上海 200092; 3. 广西大学土木工程学院,广西南宁 530004

基金项目: 国家重点基础研究发展计划（973计划）项目（2013CB036304）; 国家自然科学基金项目（41362016）; 教育部博士点基金项目（20110072110008）

详细信息

作者简介:
黄茂松(1965- ),男,教授,博士生导师,从事岩土工程方面的科研和教学工作。E-mail: mshuang@tongji.edu.cn。

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出版历程
- 收稿日期: 2014-02-24
- 发布日期: 2014-12-25

Numerical analysis of axial cyclic degradation of a single pile in saturated soft soil based on nonlinear kinematic hardening constitutive model

HUANG Mao-song^{1, 2},
LIU Ying^{1, 2, 3}

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. College of Civil and Architecture Engineering, Guangxi University, Nanning 530004, China

摘要

摘要: 针对饱和黏土的循环弱化特性,在商用有限元软件的基础上,建立了基于非线性运动硬化准则的饱和黏土循环弱化模型,在各向同性的硬化准则中引入了以等效塑性变形为变量的弱化规律,采用非线性运动硬化准则描述土体的循环滞回特性,同时考虑土体刚度的弱化。通过与饱和黏土单向循环三轴试验结果对比,验证了该模型的有效性。应用本模型,对竖向循环荷载作用下的单桩进行了二维有限元数值模拟,研究了不同循环荷载水平、不同循环次数、在不同土体刚度指数的地基中单桩竖向承载力的弱化情况。最后通过对有关文献模型试验的模拟对比验证了该数值方法的有效性。
- 非线性运动硬化 /
- 饱和黏土 /
- 桩基础 /
- 循环弱化 /
- 有限单元法
Abstract: According to the cyclic degradation behavior of saturated clay, a nonlinear kinematic hardening constitutive model considering cyclic degradation for saturated clay is developed in commercial finite element software. A degradation law with the equivalent plastic strain as a variable is introduced in the isotropic hardening rule. The nonlinear kinematic hardening law is adopted to describe the cyclic hysteretic characteristics of clay. Degradation of soil stiffness is considered as well. The model is validated against the test results of saturated clay under one-way cyclic loading. Based on this model, 2D numerical simulations of a single pile under two-way axial cyclic loading by FEM are conducted. The degradation of axial bearing capacity of a single pile under different cyclic loading levels, cyclic loading numbers and stiffness indices of soil are studied. Finally, this numerical method is validated by simulating the results of model tests in the literatures.
- nonlinear kinematic hardening /
- saturated clay /
- pile foundation /
- cyclic degradation /
- finite element method

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参考文献(16)

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