| 满腾,葛转,Herbert E.Huppert,Sergio Andres Galindo Torres.颗粒柱塌落中的尺寸效应和瞬态流变性研究[J].计算力学学报,2022,39(3):381~388 |
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| 颗粒柱塌落中的尺寸效应和瞬态流变性研究 |
| Transient rheology and size effect in granular column collapses |
| 投稿时间：2022-02-26 修订日期：2022-04-20 |
| DOI：10.7511/jslxCMGM202215 |
| 中文关键词: 颗粒材料 尺寸效应 流变性 离散元 扩展多面体 |
| 英文关键词:granular materials size effect rheology discrete element method sphero-polyhedron |
| 基金项目:国家自然科学基金面上项目(12172305)资助项目. |
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| 中文摘要: |
| 颗粒材料是自然界和工程中广泛存在和普遍应用的材料,泥石流、滑坡和混凝土等均可视为颗粒材料。颗粒材料研究有助于更好地控制相关自然灾害或利用其某些特性。对颗粒材料柱体的塌落动力学研究不仅可以方便理解颗粒材料在瞬态流动时的流变性,还可以引申到泥石流等岩土材料的运动与堆积形态。本文利用扩展多面体离散单元法对颗粒堆积柱的塌落进行了细致的研究,探索高宽比、摩擦系数以及颗粒柱相对尺寸等对柱体塌落的影响。对颗粒集合进行分网并分析每个网格内的应力与应变率之间的关系,讨论其瞬态本构关系。相关研究对于深入理解颗粒材料重力流的动力学性质以及颗粒集合体的堆积形态具有重要意义。 |
| 英文摘要: |
| Granular materials are commonly encountered in natural and engineering systems.Systems,such as debris flows and landslides,can be regarded as involving granular materials.The investigation of such systems is helpful to better deal with related natural hazards.The study of granular column collapses not only is convenient to explore the transient rheology of granular assemblies,but also can be further extended to understand the dynamics and morphology of geo-materials.We utilize the sphero-polyhedral based discrete element method (DEM) to study granular column collapses to discover the influence of aspect ratio,friction,and relative sizes.The granular system is then divided into sub-volumes,so that we can further investigate the relationship between stress and strain rate inside each sub-volume to obtain the transient rheology of gravity-driven granular flows.This study is significant for understanding gravity-driven granular flows and the deposition morphology of granular assemblies. |
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