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将修正的Burgers模型看成是Van Der Pool模型与一个非线性黏壶串联而成,认为材料损伤演化过程只是导致模型中串联黏壶的黏度降低,其他3个元件并没有受到损伤;用Weibull函数来描述沥青混合料内部缺陷的分布,从统计学的角度出发建立了损伤演化方程,将损伤引入修正的Burgers模型的非线性黏壶,建立了沥青混合料的黏弹性损伤模型;给出了蠕变应变、蠕变速度和蠕变加速度的解析表达式,证明了该模型能很好地反映沥青混合料三阶段的蠕变特性;最后通过两个试验算例验证了模型的准确性和适用性。研究结果表明,只考虑串联黏壶的损伤不仅较以往的蠕变损伤模型更加简单,而且能很好地反映实验结果,最重要的是这种处理有了更合理的理论根据。
The modified Burgers model is treated as a series of Van Der Pool model with a non-linear viscous pot. It is considered that the evolution of material damage only leads to the decrease of the viscosity of the series slimy pot and the other three components are not damaged. Weibull function To describe the distribution of internal defects in asphalt mixture, the damage evolution equation was established from the statistical point of view, and the damage was introduced into the nonlinear viscosity pot of modified Burgers model. The viscoelastic damage model of asphalt mixture was established. The analytical expression of strain, creep speed and creep acceleration proves that the model can well reflect the creep characteristics of asphalt mixture in three stages. Finally, two experimental examples verify the accuracy and applicability of the model . The results show that the damage of tannin is not only simpler than the creep damage model in the past, but also can reflect the experimental results well. The most important point is that the treatment has a more reasonable theoretical basis.