在剪切下颗粒状土壤的宏观微观力学,考虑到颗粒大小分布和颗粒形态学的结合效应
Wei Xiong1, Jianfeng Wang1,2
1Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong.
Materials (Basel, Switzerland)
|January 25, 2025
概括
粒子形态显著影响颗粒状土壤力学. 均的颗粒大小分布放大了这些效应,影响了三轴切割条件下的土壤行为.
科学领域:
- 地质技术工程 地质技术工程
- 计算力学 计算力学 计算力学
- 材料科学 材料科学 材料科学
背景情况:
- 了解粒状土壤的行为对于土木工程至关重要.
- 粒子形态和尺寸分布是影响土壤力学的关键因素.
- 需要先进的模拟技术来捕捉微尺度的土壤特性.
研究的目的:
- 研究粒子形态学 (PM) 和粒子大小分布 (PSD) 对颗粒土壤行为的影响.
- 探索PM和PSD对微宏机械反应的结合效应.
- 使用基于X射线微型计算机断层扫描 (μCT) 的新型离散元素方法 (DEM) 进行颗粒土壤分析.
主要方法:
- 用X射线微型计算机断层扫描 (μCT) 来进行粒度尺度属性提取.
- 离散元件方法 (DEM) 模拟与参数校准的一对一映射.
- 生成25个DEM样本,考虑6个PSD和4个PM.
主要成果:
- 粒子形态显著影响三轴切割下的粒状土壤反应.
- PSD统一性增强了粒子形态学对峰值偏差应力,体积应变,织物演变和剪切带形成的影响.
- 平均粒子体积对机械行为和粒子形态效应的影响最小,当PSD统一性和PM度是恒定的.
结论:
- 颗粒形态是粒状土壤力学的一个关键因素.
- 粒子大小分布的统一性调节了粒子形态学的影响.
- 开发的基于μCT的DEM技术为粒状土壤的行为提供了宝贵的见解.
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