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针对沥青砂的非线性材料特性,结合连续损伤力学理论,对传统Burgers模型进行改造,提出了粘弹塑蠕变损伤本构模型,通过对不同实验条件下沥青砂单轴蠕变试验结果的非线性拟合,获得模型参数,然后利用模型进行预测分析,得到了不同应力水平与环境温度下的蠕变曲线和损伤演化曲线,通过比较发现该文模型能够更合理地反映沥青砂加速蠕变的非线性特征,而且蠕变过程中损伤演化的速度受蠕变时间、应力水平与环境温度的影响很大。
Aiming at the non-linear material characteristics of tar sands and combining the theory of continuous damage mechanics, the traditional Burgers model is modified and the constitutive model of visco-elastic plastic creep damage is proposed. According to the uniaxial creep test results of tar sands under different experimental conditions, Linear fitting was used to obtain the model parameters. Then the model was used to predict and analyze the creep curves and damage evolution curves at different stress levels and ambient temperatures. The comparison between the model and the model shows that the model can reflect the accelerated creep of tar sands more reasonably Nonlinear characteristics, and the rate of damage evolution during creep is greatly affected by creep time, stress level and ambient temperature.