华南理工大学学报（自然科学版）2025，Vol.53Issue(10)：74-85,12.DOI:10.12141/j.issn.1000-565X.240473
不同偏应力下粒径对颗粒材料蠕变状态的影响
Influence of Particle Size on the Creep Behavior of Granular Materials Under Different Deviatoric Stress
摘要
Abstract
As a typical discontinuous medium,discrete granular materials'creep behavior plays a crucial role in the formation and evolution of geological disasters such as landslides and debris flows.However,systematic re-search on the interaction mechanism between particle size and deviatoric stress and its impact on creep behavior re-mains insufficient.To reveal the coupled effects of particle size and deviatoric stress on creep behavior,this study conducted indoor creep tests on silica spherical particles under multiple conditions and systematically analyzed the influence patterns of different particle sizes and deviatoric stresses on the creep characteristics of granular mate-rials.Based on the Derec creep model and experimental results,this study constructed a quantitative computational model of the creep state of granular materials and clarified the regulatory mechanism of particle size on the creep pa-rameters of the system.The results indicate that the creep behavior of granular systems essentially reflects the dy-namic balance between internal deformation and resistance to deformation within the particles.Creep parameters significantly influence system creep characteristics by regulating particle slip and creep behavior.Specifically,as particle size increases,the creep value of the system increases markedly,making it more prone to entering a liquid-like flow state.Concurrently,the system's resistance to deformation declines while exhibiting heightened sensiti-vity to deviatoric stress.Furthermore,an increase in particle size not only significantly enhances the fluidity of the particle system but also amplifies its sensitivity to changes in deviatoric stress.Particles with larger diameters show a more pronounced response under high deviatoric stress conditions,and the flow characteristics of granular mate-rials are more susceptible to particle size variations.This influence manifests as a positive correlation between par-ticle size and both the system's initial state parameters and characteristic strain,while exhibiting negative correla-tions with viscosity coefficient,critical creep velocity,and critical creep stress.关键词
粒径/颗粒材料/蠕变/状态演化/Derec模型Key words
particle size/granular materials/creep/state evolution/Derec model分类
建筑与水利引用本文复制引用
李涛,舒佳军,李越,万利岷,伍冰妮,邓正定,黄晶柱,Ruben Galindo..不同偏应力下粒径对颗粒材料蠕变状态的影响[J].华南理工大学学报（自然科学版）,2025,53(10):74-85,12.基金项目
新疆维吾尔自治区重大科技专项(2024A01003) （2024A01003）
国家自然科学基金项目(51508556) （51508556）
江西省自然科学基金项目(20232BAB203079,20224BAB213045) （20232BAB203079,20224BAB213045）
国家留学基金委资助项目(202406430056) Supported by the Major Science and Technology Project of Xinjiang Uygur Autonomous Region(2024A01003),the National Natural Science Foundation of China(51508556),the Natural Science Foundation of Jiangxi Province(20232BAB203079,20224BAB213045)and the Program of China Scholarship Council(202406430056) （202406430056）
