不同应力状态下沥青混合料疲劳剩余强度及损伤演化规律  

Study on the Fatigue Residual Strength and Damage Evolution of Asphalt Mixtures Under Different Stress States

作　　者：黄拓[1] 于新 林博煌 周立波 钱国平[1] 汪朝阳 HUANG Tuo;YU Xin;LIN Bo-huang;ZHOU Li-bo;QIAN Guo-ping;WANG Zhao-yang(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China;Changsha Urban Development Group Co.Ltd.,Changsha 410208,Hunan,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]长沙城市发展集团有限公司,湖南长沙410208 [3]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《中国公路学报》2024年第12期284-293,共10页China Journal of Highway and Transport

基　　金：国家重点研发计划项目(2021YFB2601200);国家自然科学基金项目(52178415);湖南省教育厅重点项目(23A0246)。

摘　　要：目前,国内外对沥青混合料疲劳特性及损伤演化规律的研究尚不深入,导致结构层剩余寿命评价失准。为此,对沥青混合料开展了不同温度与应力状态的动载强度试验,分析了最大拉应力、Tresca、Mises、Drucker-Prager、Bresler-Pister和简化Desai强度模型的适用性。结果表明:Bresler-Pister椭圆强度包络线和简化Desai六边形包络线与拉、压、劈裂强度试验点较为吻合,据此得到了考虑温度和加载速度影响的强度包络线。然后测定了不同温度和应力水平下混合料的疲劳寿命,分别选取加载次数为20%、50%、65%和80%疲劳寿命的试件进行拉、压、劈裂剩余强度试验,首次采用Bresler-Pister和简化Desai包络线的缩减表征三维强度衰变规律。进一步通过定义剩余三维强度、加载次数比等参数组,优选出基于Bresler-Pister准则建立的损伤演化模型,实现了三维强度破坏与疲劳破坏的内在统一。成果将为不同使用年限沥青层剩余强度预估及延寿设计的疲劳荷载控制研究提供试验与理论参考。At present,the research on the fatigue characteristics and damage evolution laws of asphalt mixtures in China and abroad is not sufficiently deep,resulting in inaccurate evaluation of the remaining life of structural layers.Therefore,dynamic load strength tests of asphalt mixtures under different temperatures and stress states were conducted,and the applicability of maximum tensile stress,Tresca,Mises,Drucker-Prager,Bresler-Pister,and simplified Desai strength models were analyzed based on this.The results show that the Bresler-Pister elliptical strength envelope and simplified Desai hexagonal envelope are in good agreement with the tensile,compressive,and splitting strength test points.Based on this,considering the effects of temperature and loading speed,the strength envelopes were obtained.Then,the fatigue life of the mixture was measured at different temperatures and stress levels.The specimens with loading times of 20%,50%,65%,and 80%fatigue life were selected for tensile,compressive,and splitting residual strength tests.Based on this,the Bresler-Pister and simplified Desai envelope were used for the first time to characterize the three-dimensional strength decay law.Furthermore,by defining the residual three-dimensional strength,loading times ratio,and other parameter groups,the internal unity of three-dimensional strength failure and fatigue failure was realized based on the damage evolution model established by the preferred Bresler-Pister criterion.The results of this study provide an important experimental and theoretical reference for predicting the residual strength of asphalt layers with different service lives,as well as fatigue load control in life extension design.

关 键 词：路面工程 沥青混合料 疲劳剩余强度 损伤演化规律 不同应力状态 

分 类 号：U411[交通运输工程—道路与铁道工程]