Abstract: Based on the typical pavement structure in Jiangsu Province, dynamic modulus and creep tests were carried out on SMA-13, SUP-20 and SUP-25 materials by changing the size of the specimen, temperature and load times. The results were coupled to a modified Burgers model and a user material subroutine model was developed in ABAQUS. Strain hardening and subroutine model were used to simulate indoor uniaxial tests, while rutting simulations were performed respectively on small and large scaled road loading tests. The results show that the dynamic moduli of the three kinds of materials increase with the increase of specimen size and decrease with the rise of temperature. The fatigue damage effect of SUP-25 is the most obvious, and the damage value reaches 0.419 after 5400 times of repeated loading. The error of subroutine simulation of uniaxial test is smaller than that of strain hardening model. The errors between rutting simulation and small and large scaled loading test results are 3.08% and 2.83%, respectively, indicating that the proposed model is effective in the application of both single-layer and multi-layer composite materials. The simulation results show that the deformation under 1 million cycles of high temperature loading in summer is 1.8 times that of normal temperature in spring. When the driving speed increases from 22 km/h to 120 km/h, the deformation decreases by 72.6%, the axle load increases by 100% and the rutting depth increases by 48.52%, indicating that vehicle overloading should be particularly restricted in low-speed sections in high-temperature areas. When the cumulative number of standard axle loading has exceeded 25 million, the rutting deformation has entered the accelerated accumulation stage, and the maintenance measures for the pavement structure should be taken in time.

Key words: highway engineering; structure design parameters; finite element model; accelerated pavement testing; rutting deformation

摘要： 基于江苏省典型路面结构，通过改变试件尺寸、温度和荷载作用次数对SMA-13、SUP-20和SUP-25 3种材料开展动态模量和蠕变试验。将结果耦合到修正的Burgers模型并在ABAQUS中开发用户材料子程序模型。对室内单轴试验分别采用应变硬化和子程序模型进行模拟、对小型和大型路面加载试验分别进行车辙模拟。结果表明3种材料的动态模量随试件尺寸增加而增大、温度升高而减小；SUP-25的疲劳损伤效应最为明显，在重复加载5 400次后损伤值达到了0.419。子程序模拟单轴试验的误差小于应变硬化模型、车辙模拟与小型和大型加载测试结果的误差分别为3.08%和2.83%，说明模型在单层及多层复合材料的应用中都是有效的。模拟表明夏季高温100万次加载的变形量为春季常温的1.8倍；行车速度由22 km/h增加至120 km/h时，变形量减少72.6%；轴载增加100%，车辙深度增加48.52%，表明在高温地区低速路段要尤其限制车辆超载。累计标准轴载作用次数超过2 500万次，车辙变形进入加速累积阶段，须及时对该路面结构进行养护维修。

关键词: 道路工程；结构设计参数；有限元模型；加速路面测试；车辙变形