铁道科学与工程学报2025，Vol.22Issue(1)：172-180,9.DOI:10.19713/j.cnki.43-1423/u.T20240354
AC-13沥青混合料损伤比强度理论及车辙现象预测
Damage ratio strength theory and prediction of rutting phenomenon in AC-13 asphalt mixture
摘要
Abstract
The high-grade pavement structure predominantly adopts asphalt pavement,which experiences a complex triaxial stress state under the influence of traffic loads and environmental temperature.This often leads to the occurrence of rutting.So far,there is no strength theory available to explain the phenomenon of rutting.To tackle this challenge,the damage ratio strength theory was applied within the strain decomposition assumption for the unit and the extreme value computational model of relative energy consumption rate to predict the multiaxial strength and rutting phenomenon of AC-13 asphalt mixtures.Based on the strength characteristics of the failure envelopes for asphalt mixtures under triaxial compressive conditions,and with reference to the value of damage ratio parameter for lightweight aggregate concrete under tension,five coefficients in the damage ratio variable were proposed based on multiaxial test data of asphalt mixtures,forming the damage ratio strength theory for asphalt mixtures.Results are drawn.The dimensionless triaxial strength of AC-13 asphalt mixtures remains consistent across different temperatures.The predicted results of the strength theory align well with the multiaxial strength test results of AC-13 asphalt mixtures at different temperatures.Subsequently,based on the damage ratio strength theory for asphalt mixtures,simplified forms of the confining triaxial criterion and biaxial criterion are proposed,along with recommended values for empirical coefficients.The proposed simplified criteria can reasonably predict the confining triaxial and biaxial strength values of AC-13 asphalt mixture at different temperatures.The results show that the confinement coefficient of the asphalt mixture is 2.6,which falls between lightweight aggregate concrete and plain concrete,and the ratio of biaxial isobaric strength to uniaxial compressive strength is 1.38.The damage ratio strength theory reveals that under heavy vehicle loads,asphalt pavement undergoes a triaxial isostatic stress state,resulting in zero octahedral shear stress values and exhibiting plastic flow,thereby leading to the occurrence of rutting on the pavement.关键词
沥青混合料/强度理论/损伤比/多轴应力/车辙Key words
asphalt mixture/strength theory/damage ratio/multiaxial stress/rutting分类
交通运输引用本文复制引用
吴霞,丁发兴,聂磊鑫..AC-13沥青混合料损伤比强度理论及车辙现象预测[J].铁道科学与工程学报,2025,22(1):172-180,9.基金项目
国家自然科学基金资助项目(51978664) （51978664）
中南大学中央高校基本科研业务费专项资金资助项目(2022ZZTS0603) （2022ZZTS0603）
