高速公路沥青路面车辙的产生机理及主要影响因素分析

目的 对沥青路面结构内力进行数值分析,研究路面车辙产生机理和主要影响因素,为防止早期路面车辙提出了调整级配范围等技术措施.方法 采用有限元方法 ,分析影响路面车辙主要力学指标的分布情况;采用现场检测、钻芯取样、沥青抽提、级配分析等试验方法 ,分析了高速公路沥青路面车辙的产生的主要影响因素.结果 半刚性基层沥青路面结构中3～11 cm内为等效压应力、剪应力和剪应变的高值区,中、下面层是出现流动性车辙的主要结构层;沥青混合料级配范围过于宽泛沥青胶结料高温等级偏低、及车辆超载严重等是产生车辙的主要影响因素.结论 采用有限元方法 分析路面车辙问题是可行的,结果 与工程实际相一致,车辙影响因素分析符合辽宁实际,提出的建议可用于指导工程实践.

Analysis on the Producing Mechanism and the Influence Factors of Rutting in Expressway Pavement

Numerical method has been used to compute internal force of asphalt pavement in order to analyze producing mechanism and the influence factors of rutting in expressway pavement and bring forward technology measure. Here finite element method and experiments research have been applied in the process of analysis. It is found that the middle and lower surface is the main structure in which the rutting appears. And the too wide gradation range, the low temperature grade of the asphalt cement, the choice of the fine aggregates, serious over loading were the main factors of rutting. Computing result indicated that the method applied in the paper was feasible and consistent with engineering. The analysis of the factors accorded with practice of Liaoning Province and the conclusion drawn was also available in practice.