李友云, 王斌, 高英力,等.沥青混合料弯曲疲劳损伤强度的多尺度研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2023030028

LI Y Y, WANG B, GAO Y L, et al.Multi-scale study on bending fatigue damage strength of asphalt mixture[J].Journal of Henan Polytechnic University(Natural Science) ,doi:10.16186/j.cnki.1673-9787.2023030028

沥青混合料弯曲疲劳损伤强度的多尺度研究（网络首发）

李友云1, 王斌1, 高英力1, 吕琰2

1.长沙理工大学 交通运输工程学院，湖南 长沙  410114；2.江苏中投集团股份有限公司，江苏 无锡  214000

摘要:为了验证多尺度算法数值试验模拟半圆弯拉强度参数的有效性问题，基于多尺度思想和 半圆弯曲试验，通过对沥青混合料划分不同的微观区域尺度，构建相应尺度下半圆弯曲试件的 有限元（FEM）数值模型，结合多尺度迭代运算来预测各级沥青混合料弯拉强度的方法，并将室 内半圆弯曲试验获得不同粒径的沥青混合料的弯拉强度参数作为宏观验证试验，与通过多尺 度算法数值模拟试验所得的弯拉强度进行对比分析研究。结果表明：在沥青混合料的疲劳损 伤过程中，前期材料的抗弯拉强度衰减速率较为缓慢，当在中后期时，抗弯拉强度进入了急剧 衰减阶段，多尺度数值模拟试验与室内试验得到的衰减规律相吻合，且弯拉强度相对误差的绝 对值控制在8%以内。结论是多尺度数值模拟用于预测疲劳过程中沥青混合料的抗弯拉强度 参数是有效的，该算法可以为类似的实际工程提供一定的参考意义。

关键词:沥青混合料;半圆弯曲试验;细观结构;疲劳性能;刚度参数;多尺度预测

中图分类号：U414

doi:10.16186/j.cnki.1673-9787.2023030028

基金项目:国家自然科学基金资助项目（51978080）

收稿日期:2023-03-11

修回日期:2023-04-21

网络首发日期:2023-09-26

Multi-scale study on bending fatigue damage strength of asphalt mixture（Online）

LI Youyun1, WANG Bin1, GAO Yingli1, LYU Yan2

1.School of Traffic and Transportation Engineering，Changsha University of Science and Technology，Changsha  410114，Hunan，China；2.Jiangsu Zhongshe Group Co.，LTD.，Wuxi  214000，Jiangsu，China

Abstract:In order to verify the validity of the multi-scale algorithm for numerical experiments simulating semi-circular bending and tensile strength parameters， based on the multi-scale idea and semi-circular bending test ，the finite element （FEM） numerical model of the semicircular bending specimens was constructed by dividing the asphalt mixture into different micro-area scales，and the multi-scale iterative calculation was combined to predict the bending tensile strength of asphalt mixture at all levels，and the bending and tensile strength parameters of asphalt mixtures with different particle sizes obtained by indoor semicircular bending tests were used as macro validation tests and compared with those obtained by numerical simulation tests using multi-scale algorithms. The results show that： in the process of fatigue damage of asphalt mixture，and the decay rate of flexural tensile strength is relatively slow in the early stage，while in the middle and late stage，and the flexural tensile strength enters a sharp decay stage，and the attenuation lawof multi-scale numerical simulation test is consistent with that of laboratory test，and the absolute value ofrelative error of flexural tensile strength is controlled within 8%.It is concluded that multi-scale numerical simulations for predicting the flexural and tensile strength parameters of asphalt mixtures during fatigue are effective and that the algorithm can provide some reference significance for similar practical projects.

Key words:asphalt mixture;semicircle bending test;microstructure;fatigue property;stiffness parameter;multi-scale prediction

CLC：U414