A 3D-DEM investigation on the effect of initial anisotropy in granular soils mixed with varying fines content

IF 6.2 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-09-29 DOI:10.1016/j.compgeo.2025.107648

Masoomeh Karimi, Ali Lashkari

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Abstract

The Discrete Element Method (DEM) is employed to simulate the constant-volume triaxial compression (TXC) and triaxial extension (TXE) experiments on the initially anisotropic coarse-fines particulate mixtures containing fines contents (FCs) ranging from zero to 40%. This study investigates the impact of FC on the evolution of five anisotropy variables expressed in terms of the particles’ long axes, contact normals, branch vectors, normal contact forces, and tangential contact forces in the coarse-fines mixtures. An increase in FC is found to reduce the impact of initial anisotropy. Through partitioning contacts into coarse-coarse, coarse–fine, and fine-fine categories, the participation of fines in strong force networks of the assemblies is determined. Accordingly, a micro-scale fines participation factor is defined to quantify the active participation of fines in the load-carrying microstructure of the mixtures. The critical state values of this factor are then compared to the corresponding back-calculated macro-scale phenomenological measurements.

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不同细粒含量颗粒土初始各向异性影响的3D-DEM研究

采用离散元法（DEM）对细粒含量为0 ~ 40%的初始各向异性粗细颗粒混合物进行了等体积三轴压缩（TXC）和三轴拉伸（TXE）实验。本研究考察了FC对粗粉混合物中以颗粒长轴、接触法向、分支向量、法向接触力和切向接触力表示的五个各向异性变量演化的影响。发现FC的增加可以减少初始各向异性的影响。通过将接触划分为粗-粗、粗-细和细-细三类，确定了细颗粒在组件强作用力网络中的参与程度。据此，定义了微尺度细粒参与因子，以量化细粒在混合料承载微观结构中的主动参与。然后将该因子的临界状态值与相应的后算宏观现象学测量值进行比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.