工程中典型应力路径下土的应力-应变特性分析

侯伟; 姚仰平

doi:10.13204/j.gyjz201109005

工程中典型应力路径下土的应力-应变特性分析

doi: 10.13204/j.gyjz201109005

侯伟¹,
姚仰平²

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

基金项目:

城市地下空间防水灾技术研究(07科外03)

详细信息

作者简介:
侯伟，女，1969年出生，博士，高级工程师。E－mail:houwei_bgi@163.com

中图分类号: TU432
计量
- 文章访问数: 163
- HTML全文浏览量: 13
- PDF下载量: 137
- 被引次数: 0
出版历程
- 收稿日期: 2011-09-18
- 刊出日期: 2011-09-20

ANALYSIS OF STRESS-STRAIN BEHAVIOR OF CLAY ALONG TYPICAL STRESS PATHS IN PRACTICAL PROJECTS

Hou Wei¹,
Yao Yangping²

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

摘要

摘要: 分别采用Mohr-Coulomb模型、修正剑桥模型和UH模型预测正常固结土在常规三轴压缩、三轴伸长和平均主应力p减小的压缩工况中典型路径下土的变形特性。Mohr-Coulomb模型为理想弹-塑性模型，屈服之前为弹性变形，屈服之后为变形无限增大的弹-塑性变形。修正剑桥模型能够较好地模拟压缩路径条件下正常固结土的应力-应变关系，但模型较高地估计了伸长路径条件下土的强度。UH模型为适用于正常固结土和超固结土的弹-塑性模型，其建模简单，参数与剑桥模型相同。对于正常固结土，UH模型能够退回到剑桥模型。通过采用基于SMP强度准则的变换应力方法，模型能够合理描述土的三维应力状态的特性。
- 应力路径 /
- 应力-应变 /
- 弹-塑性 /
- 本构模型
Abstract: The Mohr-Coulomb model, the modified Cam-clay model UH model were used to model the stress-strain relationships under the triaxial compression, extension and compression with decreasing principal stress conditions.The result predicted by the Mohr-Coulomb model, as a perfect elasto-plastic model, was elastic stress-strain relationship when stress point was in yield surface and is elasto-plastic stress-strain relationship with the constant stress and infinite increasing deformation when stress point was on yield surface under the triaxial compression condition. The modified Cam-clay model could be used to predict the behavior of the normally consolidated clay in the triaxial test well, but it over-estimated the strength of clay under the extension condition. The UH model for the normally consolidated clay and over-consolidated clay had the same parameters as those in the modified Cam-clay model. For the normally consolidated clay, the UH model was the same as the modified Cam-clay model. By applying the transformed stress method based on SMP criterion, the UH model could describe the property of clay in threedimension stress space.
- stress path /
- stress-strain relationship /
- elasto-plastic /
- constitutive model

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参考文献(14)

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