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进行了沥青砂试样在40℃温度,不同应力水平(0.1 MPa、0.15 MPa、0.2 MPa、0.25 MPa和0.3 MPa)下的单轴压缩蠕变试验,分析了其蠕变特性,提出了一个完整描述沥青砂整个蠕变阶段的粘-弹-塑力学模型,该模型由反映弹塑性、粘弹性和粘塑性变形的3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,理论推导了模型本构方程。为求得模型参数,编制了非线性拟合程序,得到了参数与加载应力函数关系。进行模型预测与试验结果对比,结果表明,该模型描述了试样在不同应力水平下蠕变变形的3个阶段,能够反映沥青砂粘-弹-塑变形特点。
The uniaxial compressive creep test of asphalt sand samples at 40 ℃ and different stress levels (0.1 MPa, 0.15 MPa, 0.2 MPa, 0.25 MPa and 0.3 MPa) was carried out. The creep characteristics of the samples were analyzed and a complete This paper describes the visco-elastic-plastic mechanics model of asphalt sand in the whole creep stage. The model consists of three sub-models that reflect elastoplasticity, viscoelasticity and viscoplastic deformation. By improving the viscous coefficient in the viscoplasticity model, the theoretical derivation The model constitutive equation. In order to obtain the model parameters, a non-linear fitting program was prepared and the relationship between parameters and loading stress function was obtained. The results of the model prediction and experimental results show that the model describes the three stages of creep deformation of the specimen at different stress levels and can reflect the viscous-elastic-plastic deformation of asphalt sand.