高等级重交通沥青路面损坏力学分析

The Mechanics Analysis to the Damage of High Grade Heavy Traffic Asphalt Pavement

以福建省内高速公路及其连接段的沥青路面为例,分析了目前高速公路沥青路面损坏的状态及损坏的力学原因,阐明了动水压力及空隙率对沥青路面损坏的严重影响;分析了不同轮胎接地压力非均匀分布特点,指出了沥青路面剪应力分析时应考虑不同轮胎接地压力非均布的影响;分析了不同沥青路面结构层面层及基层试验,指出了不能简单地认为弯沉值小其强度就高,剪切指标应作为沥青路面结构组合设计的依据,剪切破坏是重交通沥青路面的主要损坏原因。

Taking Fujian Provincial expressway and the connecting section of asphalt pavement as examples, the paper analyzes the damage state and damage of present expressway asphalt pavement; elucidates the se- rious affection of hydrodynamic pressure and void ratio to asphalt pavement damage;and analyzes non uni- form distribution characteristics of different tire ground pressure. It points out that the shear stress analysis in asphalt pavement should consider the non uniform distribution affection by different tire ground pres- sure;analyzes structure layer and basic level test of different asphalt pavement. It also points out that we should not simply consider when deflection value is small,its strength is high. The shear index should be used as the basis for the design of asphalt pavement structure combination,and the shear failure is the main reason to the damage of heavy traffic asphalt pavement. This paper can provide theoretical reference to ana- lyze the damage of high grade heavy traffic asphalt pavement from mechanics perspective.