沥青混合料小梁蠕变试验与数值分析  

ASPHALT MIXTURE TRABECULAR CREEP TEST AND NUMERICAL ANALYSIS

作　　者：丁灿旗 宋焕宇 

机构地区：[1]平顶山市公路管理局,河南平顶山467000

出　　处：《南阳理工学院学报》2012年第6期77-81,共5页Journal of Nanyang Institute of Technology

基　　金：高等学校博士学科点专项科研基金(20100142120074)

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 resistance is one of the important indicators to evaluate asphalt mixtures. Using One-third of trabecular point bending test to research the creep properties of asphalt mixture,conduct a study on the impact of the loading level of creep curves. By fitting the experimental creep curves for the viscoelastic parameters of asphalt mixture,using the finite element method to simulate the bending creep test of asphalt mixture,obtain the law of asphalt mixture creep trabecular at different temperatures and different loading conditions,comparing with experimental results. Research shows that,with the same temperature,as the increase of stress level the permanent deformation will increase,what’s more the stable strain development rate will also increase. Viscoelastic numerical results are in good corresponding with the experimental results,which reflect first two stages of asphalt mixture creep deformation characteristics.

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：U416.217[交通运输工程—道路与铁道工程]