The combined effect of particle angularity and inter-particle friction on micro- and macroscopic properties of granular assemblies

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-10-31 DOI:10.1016/j.compgeo.2024.106850
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Abstract

Both inter-particle friction and particle shape are known to influence the micro- and macroscopic properties of granular assemblies individually. However their combined influence is still poorly understood. In this work we perform a series of Discrete Element Simulations to systematically study the combined effect of particle angularity and friction on the shear resistance of granular aggregates. We find that for angular particles the residual shear resistance as a function of inter-particle friction shows a local maximum, while for round particles it increases monotonically until it saturates. In contrast, no such effect is observed in the packing structure of the aggregates. The non-monotonic behaviour of angular particles is mirrored by the critical state directional and normal force fabric anisotropies, while the tangential normal force anisotropy shows more similarity to the bulk porosity and the mobilization of friction at the individual particle contacts. Our results now provide a much clearer picture on the origin of the non-monotonic behaviour of the critical state shear resistance on the inter-particle friction, as a competition between sliding and rolling in two different rolling regimes.
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颗粒角度和颗粒间摩擦对颗粒集合体微观和宏观特性的综合影响
众所周知,颗粒间摩擦和颗粒形状都会单独影响颗粒集合体的微观和宏观特性。然而,人们对它们的综合影响还知之甚少。在这项工作中,我们进行了一系列离散元素模拟,系统地研究了颗粒角度和摩擦力对颗粒集合体抗剪性能的综合影响。我们发现,对于棱角分明的颗粒,残余剪切阻力与颗粒间摩擦力的函数关系显示出局部最大值,而对于圆形颗粒,残余剪切阻力单调增加直至饱和。相反,在聚合体的堆积结构中没有观察到这种效应。角形颗粒的非单调行为反映在临界状态的方向力和法向力结构各向异性上,而切向法向力各向异性则显示出与块体孔隙率和单个颗粒接触处的摩擦动员更为相似。现在,我们的结果更清楚地说明了临界状态剪切阻力对颗粒间摩擦力的非单调行为的起源,即滑动和滚动在两种不同滚动状态下的竞争。
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来源期刊
Computers and Geotechnics
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.
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