基于离散元法的橡胶颗粒沥青混合料细观结构分析  

Meso-structure of crumb rubber asphalt mixture based on discrete element method

作　　者：陈渊召[1] 李振霞[1] 

机构地区：[1]华北水利水电学院土木与交通学院,郑州450011

出　　处：《哈尔滨工业大学学报》2013年第4期116-121,共6页Journal of Harbin Institute of Technology

基　　金：国家西部交通建设科技项目(200531881213);华北水利水电学院高层次人才科研启动费资助项目(201210)

摘　　要：为分析橡胶颗粒沥青混合料的破坏机理及宏观力学性能差异的内在本质,建立离散元模型,首先系统研究间断级配橡胶颗粒沥青混合料、连续级配橡胶颗粒沥青混合料和普通沥青混合料的接触力矢量图、力链网络图及接触力局部放大图,分别得到其内部的强力链、弱力链和变形特点,提出了其承载能力排序和变形能力排序;然后深入研究橡胶颗粒沥青混合料的位移矢量图和黏结接触破坏位置局部放大图,得到橡胶颗粒沥青混合料的破坏机理.结果表明,承载能力由大到小依次为:普通沥青混合料、间断级配橡胶颗粒沥青混合料、连续级配橡胶颗粒沥青混合料;变形能力由小到大依次为:普通沥青混合料、间断级配橡胶颗粒沥青混合料、连续级配橡胶颗粒沥青混合料.To analyze failure mechanism and internal essence of macro-mechanical properties difference for crumb rubber asphalt micture, discrete element models are established, contact force vector diagram, force chain network chart and contact force local enlarging graphs belong to gap gradation crumb rubber asphalt mixture, continuous grading crumb rubber asphalt mixture and asphalt mixture are systematically studied firstly, their internal strength chain, weak force chain and deformation characteristics are obtained respectively, their bearing capacity sorting and deformability sorting are proposed. Then, local enlarged drawing in adhesive contact failure position and displacement vector map of crumb rubber asphalt mixture are deeply researched, failure mechanism of crumb rubber asphalt mixture is obtained. The results show that their bearing capacity from big to small in proper order is asphalt mixture, gap gradation crumb rubber asphalt mixture, continuous grading crumb rubber asphalt mixture. Their deformability from big to small in proper order is asphalt mixture, gap gradation crumb rubber asphalt mixture, continuous grading crumb rubber asphalt mixture.

关 键 词：道路工程 细观结构 橡胶颗粒沥青混合料 离散元法 破坏机理 

分 类 号：U416.26[交通运输工程—道路与铁道工程]