基于随机算法的沥青混合料动态模量仿真试验研究  

Experimental Study on Dynamic Modulus Simulation of Asphalt Mixture Based on Random Algorithm

作　　者：王泽玉 吴玉 WANG Zeyu;WU Yu(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《交通科技》2025年第1期118-123,共6页Transportation Science & Technology

基　　金：甘肃省科技厅计划项目(20JR10RA261)资助。

摘　　要：为从细观层面研究沥青混合料的黏弹特性,克服传统试验方法费时费力、局限性大等弊端和不足。文中基于随机算法,结合有限元进行沥青混合料三相体系模拟,生成满足级配要求的三维随机多面体骨料,并将骨料随机投放在圆柱体试件区域内,扣除要求体积的空隙单元后,对试件施加正弦应力荷载,模拟沥青混合料单轴压缩动态模量试验。结果表明,基于随机算法的三维试件可真实反映沥青混合料内部结构特征,试验过程省时省力;应力、应变结果很好地描述了沥青混合料应变滞后于应力的黏弹性行为,得到的动态模量随温度和频率的变化符合一般性规律,验证了基于随机算法的沥青混合料单轴压缩动态模量仿真试验是便利且可靠的。Studying the viscoelastic properties of asphalt mixtures at a microscopic level,can overcome the drawbacks and shortcomings of traditional testing methods,such as time-consuming,hard-sledding,and large limitations.Based on a random algorithm and combined with finite element method,the three-phase system of asphalt mixture is simulated to generate three-dimensional random polyhedral aggregates that meet the grading requirements,and the aggregates are randomly placed in the area of cylindrical specimens.After deducting the required volume of void elements,a sinusoidal stress load is applied to the specimens to simulate the uniaxial compression dynamic modulus test of asphalt mixture.The results show that the three-dimensional specimens based on random algorithms can truly reflect the internal structural characteristics of asphalt mixtures,and the experimental process is time-saving and labor-saving.The stress-strain results well describe the viscoelastic behavior of asphalt mixture with strain lagging behind stress,and the obtained dynamic modulus varies with temperature and frequency according to general laws.Therefore,it can be concluded that the simulation test of dynamic modulus of asphalt mixture under uniaxial compression based on random algorithm is convenient and reliable.

关 键 词：随机算法 动态模量 单轴压缩 数值仿真 

分 类 号：U416[交通运输工程—道路与铁道工程]