砂土的各向异性强度准则：原生各向异性

刘洋

砂土的各向异性强度准则：原生各向异性 English Version

刘洋

北京科技大学土木与环境工程学院土木系，北京 100083

基金项目: 国家自然科学基金项目（51178044）

详细信息

作者简介:
刘洋(1979- )，男，江苏徐州人，博士，副教授，主要从事土细观力学和砂土液化方面的研究与教学工作。E-mail: ly-ocean@sohu.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2013-01-06
- 发布日期: 2013-08-19

Anisotropic strength criteria of sand: inherent anisotropy

LIU Yang

Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 采用散粒材料的组构-应力微细观力学分析方法，在颗粒尺度上分析了砂土的原生各向异性强度特性。首先建立了砂土各向异性强度准则，若不考虑初始组构的变化，将蜕化为莫尔-库仑的原生各向异性强度准则，并可直接将现有的经典破坏准则推广到考虑砂土原生各向异性的情况，不需额外模型参数，方便于工程应用。接着基于三轴压缩与伸长试验破坏各向异性发展的不同，建立了考虑中主应力影响的简单破坏应力比-组构关系，建议了考虑组构演化的砂土原生各向异性强度准则，并考虑了砂土密实状态对其各向异性强度的影响。研究结果表明本文建立的原生各向异性强度准则，其物理机理比较明确，考虑了原生各向异性组构的演化，与真三轴试验结果吻合较好，有助于从微细观机理上分析砂土的原生各向异性强度特征。
- 砂土 /
- 组构 /
- 强度 /
- 原生各向异性
Abstract: Inherent anisotropy strength of sand is analyzed on the particle level based on the micromechanics of granular. An inherent anisotropic strength criterion is proposed, which will be reduced to the inherent anisotropy M-C criteria if the evolution of the initial fabric is not considered. The classical failure criteria such as M-N and L-D criteria can be extended to the inherent anisotropy strength criterion in this way and no extra model parameters are needed. In this sense, the proposed model is easy for engineering application. Based on a simple fabric-stress relationship considering the effect of intermediate principal stress, a micromechanics-based inherent anisotropy strength criterion is developed to simulate the macro-mechanical response of real sand considering the evolution of the initial fabric and the effect of density state. Finally, true triaxial tests are chosen to compare the predicted results with the proposed criteria. The numerical results indicate that the proposed strength criterion, which has rational mechanism, presents an effective approach to analyze the inherent anisotropic strength characteristics of sand.
- sand /
- fabric /
- strength /
- inherent anisotropy

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参考文献(1)

[1]

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