论文部分内容阅读
在沥青路面车辙问题的理论分析中,建立的力学模型对实际工况的模拟程度决定了车辙分析计算方法的准确性和全面性。首先,针对车辙变形中存在加速破坏变形阶段的特点,论述了基于变截面粘壶元件的“五单元六参数”非线性粘弹模型模拟车辙变形的可行性;其次,基于室内单轴压缩蠕变试验结果采用非线性拟合方法得到其模型参数,同时,给出采用实测竖向应变时程信息计算重复荷载作用下车辙变形的方法;最后,通过室内复合板结构车辙试验结果对该计算方法进行了验证。实例计算表明,基于沥青混合料非线性本构模型的车辙计算方法是可行的。
In the theoretical analysis of the rutting problem of asphalt pavement, the simulation of the actual working conditions of the established mechanical model determines the accuracy and comprehensiveness of the rutting analysis and calculation method. First of all, aiming at the characteristics of the stage of accelerated deformation during rut deformation, the feasibility of simulating the rutting deformation based on the “five elements and six parameters” nonlinear viscoelastic model is discussed. Secondly, based on the uniaxial compression Creep test results using nonlinear fitting method to obtain the model parameters, at the same time, the method of calculating the rut deformation under the repeated load using the measured vertical strain time-history information is given. Finally, through the rutting test results of the indoor composite plate structure, Method has been verified. The case study shows that the rutting calculation method based on the nonlinear constitutive model of asphalt mixture is feasible.