沥青混合料均匀性及其单轴贯入离散元模拟  

Simulation the Influence of Homogeneity in Asphalt Mixtures on Uniaxial Penetration Test Using Discrete Element Method

作　　者：范亮平 陈远播 FAN Liangping;CHEN Yuanbo(China United Engineering Co.,Ltd.,Municipal Engineering Design and Research Institute,Hangzhou 310058,China;Zhejiang Communications Highclass Highway Maintenance Co.,Ltd.,Hangzhou 310058,China)

机构地区：[1]中国联合工程有限公司市政工程设计研究院,杭州310058 [2]浙江交工高等级公路养护有限公司,杭州310058

出　　处：《交通科技》2024年第4期126-130,共5页Transportation Science & Technology

摘　　要：为探究沥青混合料单轴贯入试验的细微观机理和力学性能,基于数字图像处理技术,构建沥青混合料真实二维竖向截面离散元模型,结合沥青混合料集料均匀性指标,模拟集料竖向分布状态对沥青混合料单轴贯入试验影响,并用室内实验加以验证。结果表明,离散元可以模拟沥青混合料单轴贯入试验,可从微细观角度探究其贯入机理和力学性能;沥青混合料单轴贯入强度受加载速率影响很大,随着加载速率的增大、强度得到显著提升;集料竖向分布状态与沥青混合料单轴贯入试验强度的变异性正相关,集料竖向分布状态较好的沥青混合料,其单轴贯入强度的变异性较小,反之亦然。In order to investigation the micromechanical performance of asphalt mixture uniaxial penetration tests(UPT),the two-dimension discrete element models(DEM)of UPT with real aggregate boundaries were established based on digital image processing.Combined with the aggregate homogeneity index,the influence of aggregate vertical distribution on the UPT of asphalt mixtures were numerically simulated,and verified by the laboratory tests.Results show that particle discrete element can simulate the UPT of asphalt mixtures,and study the mechanism and physical property of the UPT from a micro perspective.The uniaxial penetration strength of asphalt mixtures is very sensitive to the loading rate,and becomes higher with an increase of the loading rate.There is a good correlation between the aggregate vertical homogeneity and the variation of the uniaxial penetration strength.The better the aggregate vertical homogeneity in asphalt mixtures is,the less the variation of the uniaxial penetration strength of asphalt mixtures is,and vice versa.

关 键 词：沥青混合料 均匀性 单轴贯入试验 离散元 

分 类 号：U414[交通运输工程—道路与铁道工程]