基于特征应力的正常固结土三维弹塑性本构模型

路德春; 李晓强; 梁靖宇; 杜修力

doi:10.11779/CJGE201901005

基于特征应力的正常固结土三维弹塑性本构模型 English Version

北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124

基金项目: 国家自然科学基金项目（51522802,51421005,51778026）;北京市自然科学基金重点项目（8161001）

详细信息

作者简介:
路德春(1977- ),男,教授,博士生导师,主要从事岩土材料的力学特性与本构理论、岩土工程地震等方面的教学和科研工作。E-mail：dechun@bjut.edu.cn。

通讯作者:
杜修力，E-mail：duxiuli@bjut.edu.cn

中图分类号: TU47
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出版历程
- 收稿日期: 2017-11-09
- 发布日期: 2019-01-24

3D elastoplastic constitutive model for normally consolidated soils based on characteristic stress

Key Lab of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 在特征应力空间中,Drucker-Prager形式的强度准则可以合理描述岩土类材料的真三维强度特性,即特征应力具有以各向同性形式的表达式描述岩土类材料各向异性力学特性的功能。在特征应力空间中,利用插值函数法直接提出了正常固结土的新的屈服函数,结合笔者已在特征应力空间中提出的塑性势函数,直接建立了正常固结土的真三维弹塑性本构模型。模型只有7个材料参数,每个参数均具有明确的物理意义,可利用室内试验简单确定。通过模型功能分析以及与文献中试验结果的对比验证表明,本文模型可简单合理地描述正常固结土的真三维变形与强度特性,并且可简化为修正剑桥模型。
- 本构模型 /
- 特征应力 /
- 真三维 /
- 非关联流动法则
Abstract: The strength criterion in the characteristic stress space, whose form is the same as that of the Drucker-Prager strength criterion, can describe the true three-dimensional strength of geomaterials. In other words, the isotropic function in the characteristic stress space can describe the anisotropic mechanical properties of the geomaterials. In the characteristic stress space, a new yield function is proposed for the normally consolidated soils on the basis of the interpolation function method. By using the plastic potential function from the authors’ previous researches, a true 3D elastoplastic constitutive model for normally consolidated soils is directly established in the characteristic stress space. There are only 7 parameters in the proposed model. All the parameters have clear physical meanings and can be easily determined through laboratory tests. The proposed model is analyzed through model simulations and is verified using the soil data available in the literatures. These results demonstrate that the proposed model can simply and reasonably describe the characteristics of the true three-dimensional strength and deformation of normally consolidated soils and can be degenerated to the modified Cam-clay model.
- constitutive model /
- characteristic stress /
- true three-dimension /
- non-associated flow rule

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参考文献(29)

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