基于特征滑动面的横观各向同性土强度特性研究

路德春; 张君鸿; 梁靖宇; 杜修力

doi:10.11779/CJGE201911004

基于特征滑动面的横观各向同性土强度特性研究 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（51778026,51421005,51538001, U1839201）; 北京市自然科学基金项目（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、岩土地震工程等方面的教学和科研工作。E-mail：dechun@bjut.edu.cn。

中图分类号: TU43
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出版历程
- 收稿日期: 2019-01-28
- 发布日期: 2019-11-24

Strength properties of transversely isotropic soils based on characteristic mobilized plane

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

摘要

摘要: 滑动面的概念旨在基于材料内摩擦,从几何与物理机制的角度来理解土体破坏的机理。基于特征应力的概念,提出了二维应力条件下特征滑动面,并推导得出特征滑动面与应力Mohr圆相对应的破坏应力条件。基于现有对横观各向同性土体强度特性的认识,并结合大主应力、沉积面法线以及特征滑动面法线之间的相对位置关系,将微观结构张量投影到特征滑动面与沉积面的相对位置向量上,推导得出横观各向同性土体的特征强度参数及其破坏条件。利用所提破坏条件对横观各向同性土体的强度方向性效应进行分析,并对照分析了沉积面法线与滑动面法线夹角ζ和沉积面法线与大主应力夹角δ对破坏条件的影响规律。更进一步利用开发的真三轴仪器的制样模具,并结合冷冻法,制作不同沉积面角度的试样并进行了真三轴试验。利用试验结果与文献中试验数据对所提破坏条件进行对比分析,验证了文中对横观各向同性土体强度特性的新认识。
- 横观各向同性 /
- 破坏条件 /
- 沉积面方向 /
- 特征滑动面 /
- 微观结构
Abstract: Based on the internal friction of materials, the concept of the mobilized plane aims at revealing the mechanism of soil failure from the perspective of geometrical and physical mechanisms. With the characteristic stress concept, the characteristic mobilized plane under two-dimensional stress conditions is put forward, and the failure stress conditions of materials on the characteristic mobilized plane and those corresponding to the stress Mohr circle are derived. In addition, based on the existing understandings on the strength characteristics of the transverse isotropic soils, and also the relative positions among the major principal stress, the normal of the bedding plane and the normal of the characteristic mobilized plane, the characteristic strength parameter, as well as the failure stress conditions, are proposed by projecting the microstructure tensor into the relative orientation tensor between the characteristic mobilized plane and the bedding plane. The orientation effect of the bedding plane is also analyzed on the basis of the proposed failure condition. The correspondences of the relative orientation angle ζ between the bedding plane and the characteristic mobilized plane and the direction angle δ between the bedding plane and the major principal stress, as well as the effects of ζ and δ, are also analyzed. By using the sample preparation mould developed for the true triaxial tests with the freezing method, the samples with different bedding plane angles are prepared and used to carry out triaxial compression tests. The understanding and proposed failure condition for the failure of the transverse isotropic soils are verified by the predicted test results in this paper and in the literatures.
- transverse isotropy /
- failure condition /
- bedding plane direction /
- characteristic mobilized plane /
- microstructure

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