统一硬化模型在FLAC3D中的开发及实现

姚仰平; 胡贺祥; 侯伟

doi:10.13204/j.gyjz201109001

统一硬化模型在FLAC3D中的开发及实现

doi: 10.13204/j.gyjz201109001

1.
1. 北京航空航天大学交通科学与工程学院,北京 100191;
2.
2. 北京市勘察设计研究院有限公司院士大师工作室,北京 100038

基金项目:

国家自然科学基金项目(50879001,10872016,11072016);教育部博士点基金项目(20091102110030)

详细信息

作者简介:
姚仰平，男，1960年出生，博士，教授，博士生导师。E－mail:ypyao@buaa.edu.cn

中图分类号: TU432
计量
- 文章访问数: 232
- HTML全文浏览量: 8
- PDF下载量: 80
- 被引次数: 0
出版历程
- 收稿日期: 2011-06-06
- 刊出日期: 2011-09-20

DEVELOPMENT AND IMPLEMENTATION OF UNIFIED HARDENING MODEL IN FLAC3D

1.
1. School of Transportation Science and Engineering,Beihang University,Beijing 100191,China;
2.
2. National Academician &Masters Research Office,BGI Engineering Consultants Ltd,Beijing 100038,China

摘要

摘要: 统一硬化模型(UH模型)能够描述超固结土的硬化、软化、剪胀和剪缩等应力-应变特性以及应力历史对土的影响。基于增量弹-塑性模型的基本假设，根据一元二次方程的解法，推导出塑性因子的表达式，由变换应力公式推得变换应力增量与真实应力增量的关系，进而得到UH模型在FLAC3D中的计算格式。基于FLAC3D软件提供的二次开发平台UDM，利用Visual C++编译得到动态链接库文件(.DLL)，实现了自定义UH本构模型的开发。通过在不同应力路径下数值解与理论解的对比，验证了UH模型的FLAC3D计算格式的正确性。通过与FLAC3D内置的修正剑桥模型对比，清晰地反映出UH模型在反映土体剪胀、软化、加卸载等方面的优越性。最后，对FLAC3D中非关联流动法则模型的优点进行了讨论。
- UH模型 /
- FLAC3D /
- 二次开发 /
- 超固结土 /
- 非关联性
Abstract: The over-consolidated unified hardening model (UH model) proposed by Yao et al can describe many characteristics of over-consolidated clays well,including stress-strain relationships,stress dilatancy,strain hardening and softening,and stress history dependency. Based on the assumption of elastic-plastic model and solution of a quadratic equation,the computational scheme of UH model in FLAC3D was derived. According to the secondary developing platform,the UH model was developed in FLAC3D with Visual C + + environment. Using that program,numerical simulations of triaxial compression,triaxial extension and plane strain tests were performed,which showed a good agreement with the analytic solution. Compared with the modified Cam-clay model,UH model had several advantages in stress dilatancy,strain softening,loading and unloading features. Finally,the advantage of using constructive models with nonassociated flow rule in FLAC3D was discussed.
- UH model /
- FLAC3D /
- secondary development /
- over-consolidated soil /
- nonassociation

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参考文献(16)

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