摘要
为研究沥青混合料蠕变特性与其时-温条件下的蠕变规律,准确反映沥青混合料蠕变过程及蠕变数值,引入反映材料内部损伤效应的损伤因子,对Burgers模型进行非线性修正,建立修正Burgers蠕变模型,并通过沥青混合料单轴压缩蠕变实验和离散元PFC模拟蠕变试验进行对比分析,以验证模型的可靠性.研究结果表明:通过修正模型对实验结果的拟合分析,得出沥青混合料时-温蠕变过程的5个发展阶段及各自特点;推导出不同温度沥青混合料蠕变值计算公式;建立的非线性材料损伤蠕变模型可较好地描述沥青混合料蠕变过程.
In order to study the creep characteristics of asphalt mixture and its creep law under time-temperature conditions,and reflect the creep process and creep value of asphalt mixture accurately,a damage factor reflecting the internal damage effect of the material was introduced,and the Burgers model was modified nonlinearly.The modified Burgers creep model is established,and the comparative analysis is carried out through the uniaxial compression creep test of asphalt mixture and the discrete element PFC simulation creep test to verify the reliability of the model.The results show that the five development stages and their respective characteristics of the time-temperature creep process of the asphalt mixture are obtained through the fitting analysis of the modified model to the experimental results;the calculation formula of the creep value of the asphalt mixture at different temperatures is deduced;the nonlinear material damage creep model can describe the creep process of asphalt mixture well.
作者
肖敏敏
李春岩
朱兴一
董金勇
XIAO Minmin;LI Chunyan;ZHU Xingyi;DONG Jinyong(School of Urban Construction and Safety Engineering,Shanghai Institute of Technology,Shanghai 201418,China;Key Laboratory of Road and Traffic Engineering,Minitry of Education,Tongji Universty,Shanghai 200092,China)
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2023年第1期89-97,共9页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
国家自然科学基金优秀青年基金项目(51922079)
上海市大学生创新创业训练项目(DCX20220673)。
