| 摘要: |
| 为探究沥青路面车辙形成过程，以力学经验法研究了3种结构类型沥青路面的车辙累积规律，研究流程包含温度场、沥青混合料动态模量和沥青混合料动态蠕变模型3个分析模块，其中沥青混合料动态模量和动态蠕变模型通过试验方法获取.由温度场分析模块得到不同时刻沥青路面各层的温度，通过不同温度和加载频率下试验获取沥青混合料动态模量，以此作为力学模型参数计算获取不同时刻沥青路面各层的应力状态，进而根据动态蠕变模型分析沥青路面不同层位的塑性应变，累积得到整个沥青路面面层的车辙量.结果表明：AC+AC+AC结构上、中面层为车辙产生的主要层位，而将该结构AC上面层替换为SMA上面层可显著降低沥青路面的车辙量，此时中面层对路面的车辙贡献最大.因此，从减少车辙的角度出发，推荐沥青路面结构采用SMA+AC+AC或SMA+AC+LSPM（大粒径排水碎石）结构，同时应加强中面层材料的高温稳定性设计. |
| 关键词: 沥青路面 车辙 力学经验法 动态模量 动态蠕变模型 |
| DOI：103969/j.issn1007 9629201601021 |
| 分类号: |
| 基金项目:山东省自然科学基金资助项目（ZR2011EEQ027） |
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| Analysis of Rutting Resistance of Asphalt Pavement |
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SHAN Jingsong, WU Shuyin
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Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology, Qingdao 266510, China
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| Abstract: |
| To make clear of the developing process of rutting, the accumulated plastic deformation of three types of asphalt pavement structure with semi rigid base was studied based on mechanistic empirical method. Three modules were included in the analysis process that were temperature field, dynamic modulus and dynamic creep model of asphalt mixture. Among them, dynamic modulus and dynamic creep model of asphalt mixture were obtained by laboratory tests. Firstly, temperature field module was used to get the temperature values of different points in asphalt layer and the dynamic moduli corresponding to the temperatures with different loading frequencies were input into mechanical model as parameters to get the stress status of asphalt pavement. Then, plastic strains of asphalt layers were analyzed by the dynamic creep model and the total rutting was calculated. The results show that surface and middle AC layers have the most contribution to rutting in the AC+AC+AC structure. If the surface AC layer is substituted with surface SMA layer, the rutting in asphalt pavement will be reduced significantly and the rutting in middle AC layer will be the most. So, to reduce the rutting in asphalt pavement, SMA+AC+AC structure and SMA+AC+LSPM（large stone porous asphalt mixture） structure should be recommended and meanwhile, the high temperature stability of materials used in middle layer should be paid much attention in the design. |
| Key words: asphalt pavement rutting mechanistic empirical method dynamic modulus dynamic creep model |
