沥青混合料小梁蠕变试验与数值分析  

Trabecular Creep Test and Numerical Analysis of Asphalt Mixtures

作　　者：杨海玲 毛磊[2] 

机构地区：[1]广东交通集团检测中心,广州510550 [2]广东省长大公路工程有限公司,广州511431

出　　处：《公路交通技术》2013年第1期27-30,共4页Technology of Highway and Transport

摘　　要：蠕变性能是评价沥青混合料的重要指标之一。利用三分点小梁弯曲试验对沥青混合料的蠕变性能进行研究,探讨加载水平对蠕变曲线的影响。通过对试验蠕变曲线的拟合,获取沥青混合料的粘弹性参数,利用有限元方法对沥青混合料小梁的弯曲蠕变试验进行数值模拟,得出不同温度及不同荷载条件下沥青混合料小梁蠕变规律,并与试验结果进行比较。研究表明,同一温度下,随着应力水平的增大,永久变形会随之增大,且稳定期应变发展速率也会增大;粘弹性数值分析结果与试验结果吻合良好,可以反映沥青混合料蠕变前2个阶段的变形特征。Creep performance is one of the important indices evaluating asphalt mixtures.This paper researches creep performance of asphalt mixtures by means of three-point trabecular bending test and discusses influences of loading level on creep curves.The paper acquires viscoelastic parameters of asphalt mixtures via fitting of the tested creep curves and conducts numerical simulation for trabecular bending creep test of asphalt mixtures by means of finite element method to obtain the law of trabecular creep of asphalt mixtures at different temperatures and different loads and compares them with test results.The research shows that permanent deformation will increase with stress level at the same temperature and strain development rate in stable period will also increase;numerical analysis results of viscoelasticity coincide with test results perfectly and can reflect deformation features at two stages before creep of asphalt mixtures.

关 键 词：沥青混合料 蠕变 粘弹性 广义Maxwell模型 数值分析 

分 类 号：U414[交通运输工程—道路与铁道工程]