沥青混合料剪切疲劳寿命数值模拟  

NUMERICAL SIMULATION OF SHEAR FATIGUE LIFE OF ASPHALT MIXTURES

作　　者：陆学元 彭勇[2] 魏星 郭泽宇 王重阳 LU Xueyuan;PENG Yong;WEI Xing;GUO Zeyu;WANG Chongyang(Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;Institute of Transportation Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]安徽省交通控股集团有限公司,合肥230088 [2]浙江大学交通工程研究所,杭州310058

出　　处：《低温建筑技术》2024年第4期83-87,共5页Low Temperature Architecture Technology

摘　　要：现有沥青混合料疲劳性能研究,主要集中在混合料弯拉疲劳性能方面,有关混合料剪切疲劳性能的研究并不多,通过数值模拟来研究混合料剪切疲劳性能则更少。基于图像技术和内嵌损伤模型三维离散元法,以重复单轴贯入试验为载体,建立沥青混合料剪切疲劳试验微观力学模型,模拟不同工况,即不同温度和油石比条件下,沥青混合料剪切疲劳寿命,并通过已有的试验加以验证。研究结果表明,基于内嵌损伤模型三维离散元法可以较好地预估沥青混合料剪切疲劳寿命,温度和油石比对沥青混合料剪切疲劳寿命影响很大。同一沥青混合料,其剪切疲劳寿命随温度升高而降低;相同集料级配和温度,最佳用油量条件下沥青混合料剪切疲劳寿命最大。研究可为抗剪切疲劳沥青混合料设计提供借鉴与参考。The existing research on the fatigue performance of asphalt mixtures mainly focuses on the bending and tensile fatigue performance of mixtures.There is not much research on the shear fatigue performance of mixtures.Based on image technology and embedded damage model 3D discrete element method,a micro mechanical model of asphalt mixture shear fatigue test is established using repeated uniaxial penetration test as the carrier.The shear fatigue life of asphalt mixture is simulated under different temperatures and asphalt ratios,which is verified through existing experiments.The research results indicate that the three-dimensional discrete element method based on the embedded damage model effectively predicts the shear fatigue life of asphalt mixtures,and temperature and asphalt ratios have a significant impact on the shear fatigue life of asphalt mixtures.The shear fatigue life of the same asphalt mixture decreases with increasing temperatures.The maximum shear fatigue life of asphalt mixture is achieved under the optimal oil consumption conditions with the same aggregate gradation and temperatures.The research may provide the reference and guidance for the design of anti-shear fatigue asphalt mixtures.

关 键 词：沥青混合料 剪切疲劳寿命 重复单轴贯入试验 内嵌损伤 三维离散元法 

分 类 号：TU535[建筑科学—建筑技术科学]