基于三维柔性薄膜边界的土石混合体大型三轴试验颗粒离散元模拟

金磊; 曾亚武

doi:10.11779/CJGE201812018

基于三维柔性薄膜边界的土石混合体大型三轴试验颗粒离散元模拟 English Version

金磊^1,2,
曾亚武²

1. 湖北理工学院土木建筑工程学院,湖北黄石 435003;
2. 武汉大学土木建筑工程学院,湖北武汉 430072

基金项目: 国家自然科学基金面上项目（41272342）; 湖北省高等学校优秀中青年科技创新团队计划项目（T201823）; 湖北理工学院校级科研项目（18xjz14R）

详细信息

作者简介:
金磊(1989- ),男,博士,主要从事复杂岩土体三维颗粒离散元建模及其变形破坏机理等方面的研究工作。E-mail：whujinlei@whu.edu.cn。

中图分类号: TU411
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出版历程
- 收稿日期: 2017-10-15
- 发布日期: 2018-12-24

Numerical simulation of large-scale triaxial tests on soil-rock mixture using DEM with three-dimensional flexible membrane boundary

JIN Lei^1,2,
ZENG Ya-wu²

1. School of Civil Engineering and Architecture, Hubei Polytechnic University, Huangshi 435003, China;
2. School of Civil Engineering, Wuhan University, Wuhan 430072, China

摘要

摘要: 为了有效模拟土石混合体室内大型三轴试验侧向柔性乳胶膜的力学行为,提出了一种可行的三轴试验侧向柔性薄膜边界的三维离散元模拟方法,即三维组合墙法。结合已开发的不规则块石及土石混合体三维离散元建模方法,建立了可考虑柔性薄膜边界的土石混合体大型三轴试样三维离散元模型。引入平行黏结模型以更好地模拟胶结土石混合体中颗粒间的胶结作用,通过开展大型三轴数值试验逐一全面地标定了无胶结土石混合体和胶结土石混合体数值模型的细观力学参数。分析了无胶结土石混合体和胶结土石混合体数值试样的变形破坏过程及特征,并与室内试验结果进行了对比。结果表明：所提出的三维柔性薄膜边界建模方法原理简单,参数较少,易于实现,且能节省计算资源;基于三维柔性薄膜边界的土石混合体大型三轴试验颗粒离散元模拟能较好地再现土石混合体的应力-应变特征、无胶结土石混合体的鼓肚变形破坏特征、胶结土石混合体变形局部化的过程及其剪切带的细观结构特征。
- 土石混合体 /
- 大型三轴试验 /
- 三维柔性薄膜边界 /
- 颗粒离散元 /
- 变形破坏特征
Abstract: In order to effectively simulate the mechanical behavior of lateral flexible latex film used in large-scale triaxial tests on soil-rock mixture (SRM), a feasible three-dimensional discrete element (3-D DEM) modeling method, named 3-D wall-arrangement method for the flexible membrane boundary, is proposed. In conjunction with the previously developed 3-D DEM modeling method for irregularly shaped rock blocks and SRM, the 3-D DEM models of SRM large-scale triaxial specimens are constructed. Then, the parallel-bond model is introduced to better simulate the cementation in cemented SRM, and the meso-mechanical parameters of numerical specimens are calibrated comprehensively by conducting a series of numerical large-scale triaxial tests. Finally, the deformation and failure processes and characteristics of numerical specimens of uncemented and cemented SRMs are analyzed and compared with the results of the corresponding laboratory experiments. The results show that the proposed modeling method for three-dimensional flexible membrane boundary presents many obvious advantages including simple principle, fewer parameters, convenient implemention and saving computing resources. The stress-strain characteristics of SRM, bulging deformation of uncemented SRM, deformation localization process and meso-structural characteristics of shear band of cemented SRM are all well reproduced by carrying out the DEM simulation of large-scale triaxial test on the constructed and calibrated SRM model with the developed three-dimensional flexible membrane boundary.
- soil-rock mixture /
- large-scale triaxial test /
- three-dimensional flexible membrane boundary /
- granular discrete element simulation /
- deformation and failure characteristic

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参考文献(19)

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