期刊论文

Improving three-dimensional DEM modeling methods for irregularly shaped particles and their assembly

Zeng, Ya-Wu(zengyw@whu.edu.cn)

中文

岩土工程学报

1000-4548

2017

39

7

1273-1281

10.11779/CJGE201707014

国家自然科学基金项目（41272342）；

本校为其他机构

以土石混合体中的不规则块石和含石量为40%的土石混合体室内大三轴试样为例,研究了如何针对当前岩土材料建模方法的不足进行改进以建立尽可能真实的不规则颗粒及其集合体的三维离散元模型。为了模拟块石的真实形态特征,明确了块石几何模型建模方法的控制参数及其确定方法,建立了与真实块石球度相同、棱角度相似的三维半真实离散元模型。为了计算模型的体积以用于模型密度优化及颗粒集合体孔隙率的计算,提出了一种三维离散元模型虚拟切片技术,结合数字图像处理技术可快速准确计算块石三维半真实离散元模型的体积。为了使得土石混合体大三轴试样三维离散元模型的密实度与室内试样保持一致并兼顾建...

Based on the irregularly shaped rock blocks in soil-rock mixture (SRM) and the large-scale triaxial specimens of SRM with rock block proportion of 40% prepared indoor, this study aims at constructing three-dimensional DEM models for the irregularly shaped particles and their assembly as realistic as possible by improving the current modeling methods. To simulate the morphological characteristics of rock blocks, the controlling parameters of the proposed modeling methods for the geometric model for rock blocks and their evaluation methods are identified, and then the three-dimensional semi-real...