基于离散元法的空隙特征对沥青混合料虚拟剪切疲劳寿命的影响  

Effect of void characteristics on virtual shear fatigue life of asphalt mixtures using discrete element method

作　　者：彭勇[1] 杨汉铎 陆学元 李彦伟[3,4] PENG Yong;YANG Han-duo;LU Xue-yuan;LI Yan-wei(Institute of Transportation Engineering,Zhejiang University,Hangzhou 310058,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050011,China;Research and Development Center of Transport Industry of Technologies,Materials and Equipments of Highway Construction and Maintenance,Shijiazhuang 050011,China)

机构地区：[1]浙江大学交通工程研究所,杭州310058 [2]安徽省交通控股集团有限公司,合肥230088 [3]河北省交通规划设计院,石家庄050011 [4]公路建设与养护技术、材料及装备交通运输行业研发中心,石家庄050011

出　　处：《吉林大学学报（工学版）》2021年第3期956-964,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：浙江省自然科学基金项目(LY15E080006)。

摘　　要：基于图像技术和三维离散元法,建立了具有真实空隙大小和分布以及随机空隙大小和分布的沥青混合料剪切疲劳微观力学模型,通过模拟不同集料粒径、用油量以及温度下的沥青混合料剪切疲劳寿命,研究了空隙分布特征对沥青混合料虚拟剪切疲劳寿命的影响,并将部分模拟结果与试验结果进行对比。结果表明:基于三维离散元法可以模拟沥青混合料剪切疲劳寿命,空隙特征对沥青混合料虚拟剪切疲劳寿命有较大影响。在相同模型参数条件下,具有真实空隙大小和分布的沥青混合料剪切疲劳寿命小于具有随机空隙大小和分布的沥青混合料剪切疲劳寿命,但与试验结果更为接近。此外,集料粒径和用油量也对沥青混合料剪切疲劳寿命有着显著影响。沥青混合料剪切疲劳寿命随集料粒径的增大而提高;在相同集料级配和试验温度时,在最佳用油量条件下的沥青混合料剪切疲劳寿命最大;在相同的集料级配和用油量时,沥青混合料剪切疲劳寿命随温度的升高而降低。This paper aims to investigate the effect of void characteristics on the virtual shear fatigue life of asphalt mixtures.Using image techniques and three-dimensional(3D)Discrete Element Method(DEM),the micromechanical models for the shear fatigue life of asphalt mixtures were established considering the real void size and distribution and random void size and distribution.The shear fatigue lives of asphalt mixtures with different aggregate sizes,binder contents,and temperatures were simulated based on these models.Some simulation results were compared with the experimental results.Research results show that the shear fatigue life of asphalt mixtures can be simulated using 3D DEM,and void characteristics significantly affect the virtual shear fatigue life.With the same model parameters,the shear fatigue life considering the real void size and distribution is less than that considering the random void size and distribution,but is closer to the experimental results.Furthermore,aggregate size and binder content also remarkably affect the shear fatigue life of asphalt mixtures.The shear fatigue life increases with the nominal maximum aggregate size(NMAS).Under the same conditions of NMAS and temperature,the shear fatigue life is the lonest with the optimal binder content.Under the same conditions of NMAS and binder content,the shear fatigue life decreases as the temperature increases.

关 键 词：道路工程 沥青混合料 剪切疲劳寿命 空隙特征 离散法 

分 类 号：U414[交通运输工程—道路与铁道工程]