论文部分内容阅读
利用数字图像技术对沥青混凝土CT图像进行了处理,并在此基础上建立了考虑微观结构的二维沥青混凝土单轴蠕变试验有限元模型。以沥青砂浆和集料的力学参数作为输入,利用该模型计算了沥青混凝土试件在荷载作用下的蠕变曲线,实现了沥青混凝土单轴蠕变虚拟实验仿真。利用burgers模型对虚拟实验结果进行了拟合,求解了沥青混凝土试件的松弛模量prony级数,并用有限元结果与虚拟实验结果进行了对比,结果表明,基于CT技术的虚拟试验可以有效地反映沥青混凝土的蠕变力学特性。
The digital image technique was used to process the CT images of asphalt concrete. On this basis, the finite element model of uniaxial creep test of two-dimensional asphalt concrete considering the microstructure was established. Taking the mechanical parameters of asphalt mortar and aggregate as input, the creep curves of asphalt concrete specimens under load were calculated by using the model, and the virtual experimental simulation of asphalt concrete uniaxial creep was realized. The burgers model was used to fit the virtual experiment results, and the relaxation module prony series of asphalt concrete specimens were solved. The results of the finite element simulation and the virtual experiment were compared. The results show that the virtual experiment based on CT can effectively Reflect the creep mechanical properties of asphalt concrete.