Abstract

The discrete element method (DEM) has been extensively used to capture the macroscopic and particulate response of granular materials. Although particle rolling (i.e. controlled by rolling resistance) has been acknowledged as a major contributing factor towards micro-mechanical behaviour of idealized spherical granular material, its influence on characteristic behaviour has not been thoroughly investigated within critical state soil mechanics (CSSM) framework. For instance, the influence of particle rolling on characteristic features of undrained and drained behaviour (e.g. phase transformation, characteristic state, instability, dilatancy, critical state) and the state parameter, (ψ) has not been captured. In this study, a series of constant volume (CV) and drained triaxial compression simulations were undertaken using a rolling resistance linear contact model, deployed within a DEM software. The CSSM framework was centrally used to assess the influence of particle rolling tendencies/resistance on CV and drained behaviours from both a macro- and micro-mechanical standpoint. The study advanced the current understanding of the influence of rolling resistance on CS-related behaviour.

Graphic abstract

中文翻译：

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在临界状态土壤力学框架下评估颗粒滚动对粒状材料特征的影响

摘要

离散元素方法（DEM）已被广泛用于捕获颗粒材料的宏观和颗粒响应。尽管颗粒滚动（即受滚动阻力控制）已被认为是影响理想球形颗粒材料微机械性能的主要因素，但尚未在临界状态土壤力学（CSSM）框架内彻底研究其对特征性能的影响。例如，粒子轧制的上不排水和排水行为特征的影响（例如相变，特征状态，不稳定性，胀流性，临界状态）和状态参数，（ψ）尚未被捕获。在这项研究中，使用在DEM软件中部署的滚动阻力线性接触模型进行了一系列恒定体积（CV）和排水三轴压缩模拟。CSSM框架主要用于从宏观和微观机械角度评估颗粒滚动趋势/阻力对CV和排放行为的影响。该研究提高了当前关于滚动阻力对CS相关行为的影响的认识。

图形摘要