摘要
为了准确描述沥青混合料整个蠕变过程,解决现有黏弹性模型的不足,对经典模型进行了扩展。运用非定常参数替换定常参数的方法,把经典Zener模型、Zener模型与黏壶串联结构中的黏性参数看为时间的函数。利用元件串联、并联时的力学关系,推导改进模型本构方程和蠕变函数的一般形式。通过选择参数的具体时变形式求出具体的蠕变函数,发现一些经验蠕变公式是改进后模型的蠕变函数;通过蠕变特征的分析,发现改进后的模型具有较广的描述范围;通过拟合不同沥青混合料的蠕变试验数据,发现修正后的模型对试验数据有较好的拟合效果。给出的变参数模型实现了用较少的参数对沥青混合料3阶段蠕变过程给出比较准确的描述。
In order to accurately describe the creep process of asphalt mixture and solving the shortcoming of traditional viscoelastic model, the classic model is improved. Using the method of replacing the stationary parameters with non-stationary parameters, the viscous parameters in classical Zener model and the series structure of Zener model with dashpot are regarded as time functions. Using the mechanical relationship of parallel connection and series connection, the generalized constitutive relation and creep function of the improved model are derived. Through choosing the parameters＇ specific time-varying form, the creep function is solved. It is found that the improved model includes some empirical creep formulas. Through analyzing creep characteristics, it is found that the improved model has wider description range. Through fitting different creep test data, it is found that the improved model＇s theoretic curves are coincident well with the testing curves. The proposed variable parameter model realized the accurate description for the 3-phase creep of asphalt mixture with relatively small number of parameters.
出处
《公路交通科技》
CAS
CSCD
北大核心
2015年第7期13-17,共5页
Journal of Highway and Transportation Research and Development
基金
中央高校基本科研业务费专项资金项目(ZY20150206)
山西省基础研究项目(2014021032-2)
关键词
道路工程
沥青混合料
蠕变模型
变参数
黏壶
road engineering
asphalt mixture
creep model
variable parameter
dashpot
