【摘要】 为探究沥青路面车辙性能,采用UTM试验机进行动态模量试验,根据Schapery和Park提出的方法将频域内的动态模量转换成时间域的松弛模量,采用WLF方程和Sig-moidal函数,利用非线性最小二乘法建立松弛模量主曲线,通过瞬态剪切模量G(0)将G(t)归一化获得剪切模量比g(t),使用1stopt里的麦夸特法(Levenberg-Marquardt)进行多元非线性曲线拟合,获得Prony级数广义Maxwell模型,得到沥青混合料粘弹性本构模型,利用Abaqus有限元分析软件建立沥青混合料数值模拟仿真模型,通过室内车辙试验验证模型可靠,表明,采用Prony级数的本构模型能够很好地描述沥青混合料粘弹特性,所建立的仿真模型能较合理地模拟沥青混合料力学响应;利用广义Maxwell模型粘弹性沥青混合料本构模型来研究沥青路面车辙性能是可行的。更多还原

【Abstract】 In order to explore the rutting performance of asphalt pavement,UTM testing machine was used to test the dynamic modulus. According to Schapery and Park’s method,the dynamic modulus in frequency domain was converted into the relaxation modulus in time domain. The main curve of relaxation modulus was established by using WLF equation and Sigmo-moidal function,and the ratio of shear modulus g( t) was obtained by normalizing the transient shear modulus G( 0). The Levenberg-Marquardt method in 1stopt is used to fit the multivariate non-linear curve,and the generalized Maxwell model of Prony series is obtained. The viscoelastic constitutive model of asphalt mixture is obtained. The numerical simulation model of asphalt mixture is established by Abaqus finite element analysis software. The reliability of the model is verified by indoor rutting test,which shows that the constitutive model of Prony series can be very good. The viscoelastic characteristics of asphalt mixture are well described,and the simulation model can reasonably simulate the mechanical response of asphalt mixture. It is feasible to study the rutting performance of asphalt pavement by using the constitutive model of viscoelastic asphalt mixture based on generalized Maxwell model.更多还原