结构性黄土双轴压缩试验的离散元数值仿真分析

蒋明镜; 李涛; 胡海军

结构性黄土双轴压缩试验的离散元数值仿真分析 English Version

蒋明镜^{1, 2},
李涛^{1, 2},
胡海军³

1. 同济大学地下建筑与工程系,上海 200092; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 西北农林科技大学水利与建筑工程学院,陕西杨凌 712100

详细信息

作者简介:
蒋明镜(1965- )，男，教授，博士生导师，国家杰出青年基金获得者，主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail: mingjing.jiang@tongji.edu.cn。

中图分类号: TU444
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出版历程
- 收稿日期: 2013-06-06
- 发布日期: 2013-11-24

Numerical simulation of biaxial tests on structured loess by distinct element method

JIANG Ming-jing^{1, 2},
LI Tao^{1, 2},
HU Hai-jun³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering. Ministry of Education, Tongji University, Shanghai 200092, China; 3. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China

摘要

摘要: 通过建立胶结强度与初始含水率之间的关系将含水率引入胶结接触模型,并将其应用于饱和重塑土和不同含水率结构性黄土离散元试样的常规双轴试验数值模拟中。结果表明：结构性黄土离散元试样双轴试验的宏观力学行为与天然结构性黄土室内三轴试验结果相似。即围压越低,含水率越低,则试样越容易表现出应变软化和剪胀；反之则试样越容易表现为应变硬化和剪缩。该宏观力学行为与试样粒间胶结破坏密切相关。即围压越低,含水率越低,则试样固结过程产生的胶结破坏越少,后续胶结破坏对试样宏观力学行为影响较大,试样越容易表现出应变软化和剪胀。
- 黄土 /
- 结构性土 /
- 胶结颗粒材料 /
- 离散单元法 /
- 双轴试验
Abstract: A relationship between the bond strength and the initial water content is established and used to incorporate water content to a bond contact model. Then using this model, various numerical biaxial tests on remolded and structured loess samples with different water contents are carried out by means of the distinct element method. The following conclusions can be drawn from these simulations. The macro-mechanical behaviors of biaxial tests on numerical and natural loess samples are similar. That is, as the confining pressure and initial water content decrease, the samples exihibit much strain softening and shear dilatancy. As the confining pressure and initial water content increase, however, the samples perform much strain hardening and shear contraction. The macro-mechanical behaviors are associated with the inter-particle bond breakage. Because fewer bonds of samples with lower confining pressure and initial water content are broken in the consolidation, the bonds affect biaxial compression more and the samples exhibit strain softening and shear dilatancy relatively.
- loess /
- structured soil /
- cemented granular matter /
- distinct element method /
- biaxial test

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参考文献(14)

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结构性黄土双轴压缩试验的离散元数值仿真分析 English Version

作者简介: 蒋明镜(1965- )，男，教授，博士生导师，国家杰出青年基金获得者，主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail: mingjing.jiang@tongji.edu.cn。

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Numerical simulation of biaxial tests on structured loess by distinct element method

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作者简介:
蒋明镜(1965- )，男，教授，博士生导师，国家杰出青年基金获得者，主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail: mingjing.jiang@tongji.edu.cn。