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采用加载0.1 s、卸载0.9 s的半正弦波间歇荷载模拟路面实际的车辆荷载,利用线性Drucker-Prager蠕变模型对重复荷载下AC-13C基质、改性沥青混合料的变形进行黏弹塑性数值模拟,预测得到的变形与实测变形相比非常一致。沥青混合料的蠕变应变随着时间的增长而增大,初期增长率大而后期增长率小。在沥青混合料未屈服时,蠕变应变就是沥青混合料的永久应变;当沥青混合料发生屈服,产生了不随时间变化的塑性应变,此时蠕变应变加上塑性应变即为沥青混合料的永久应变。结果表明线性Drucker-Prager蠕变模型可以预测重复荷载作用下沥青混合料的变形,可用于移动荷载下沥青混凝土路面结构的力学响应分析。
The actual vehicle load of the pavement was simulated by the semi-sine wave intermittent load with a loading of 0.1 s and unloading of 0.9 s. The linear Drucker-Prager model was used to simulate the deformation of the AC-13C matrix and the modified asphalt mixture under repeated loading. Simulation, prediction of deformation and measured deformation is very consistent. The creep strain of asphalt mixture increases with time, the initial growth rate is large and the later growth rate is small. When the asphalt mixture is not yielding, the creep strain is the permanent strain of the asphalt mixture. When the asphalt mixture yields, the plastic strain does not change with time. At this time, the creep strain plus the plastic strain is the asphalt mixture Permanent response. The results show that the linear Drucker-Prager creep model can predict the deformation of asphalt mixture under repeated loading and can be used to analyze the mechanical response of asphalt pavement structure under moving loads.