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在0.1MPa、0.15MPa、0.2MPa、0.25MPa和0.3MPa下进行了沥青砂试样单轴压缩和蠕变实验,分析了其压缩和蠕变性质,根据变形机理提出了粘弹塑本构模型可由粘弹性和粘塑性的两个子模型串联构成,通过对粘塑性子模型中粘性系数进行改进,理论推导了模型蠕变本构方程,确定了模型参数,并求得模型参数与加载应力函数关系。进行模型预测与实验结果对比,结果表明:该模型能够描述沥青砂试样在不同应力下蠕变变形的3个阶段,反映了沥青砂混合料粘弹塑变形特点。
The uniaxial compression and creep tests of asphaltic sands were carried out at 0.1MPa, 0.15MPa, 0.2MPa, 0.25MPa and 0.3MPa. The compression and creep properties were analyzed. Based on the deformation mechanism, the viscoelasto-plastic constitutive model The viscoelasticity and viscoplasticity of two submodels can be made in series. Through the improvement of the viscous coefficient in the viscoplasticity submodel, the constitutive equation of the creep model is deduced theoretically, the model parameters are determined, and the relationship between the model parameters and the loading stress function . The results of the model prediction and experimental results show that the model can describe the three stages of asphalt sand samples creep deformation under different stresses and reflect the viscoelastic plastic deformation characteristics of the asphalt sand mixture.