高温地区沥青路面结构抗车辙性能分析

Analysis of Rutting Resistance Performance of Asphalt Pavement Structure in High Temperature Area

车辙是高温地区沥青路面主要的病害之一,为分析温度对沥青路面抗车辙性能的影响,选取半刚性基层、冷再生基层及柔性基层3类典型的沥青路面结构,采用ANSYS有限元软件建立模型,以应力、应变及车辙预估值来表征不同结构沥青路面的抗车辙性能。研究结果表明：沥青路面结构剪应力、剪应变峰值出现在距路表6～7cm处,压应变峰值在距路表6～7cm处,且应力应变峰值出现位置基本上不随温度变化;随着温度的增加,应变的增长较应力更为明显;在高温条件下,与半刚性基层和冷再生基层沥青路面相比,柔性基层沥青路面具有更好的抗车辙性能。

Rutting is one of the main shortcome of asphalt pavement in high temperature area. In order to .analyze the influence of temperature on rutting resistance performance of asphalt pavement, three typical asphalt pavement structure, semi-rigid base,cold recycling base and flexible base, were selected, and the ANSYS finite element software was used to build model. The rutting resistance performance of asphalt pavement with different structures was characterized by stress, strain and the value of rutting prediction. The experimental results show that the peak values of shear stress, shear strain and compressive strain of asphalt pavement are not significantly changed with shifty temperature, and its appear at 6～ 7 cm below the road surface. The strain increases more rapidly than stress with the increase of temperature. Compared with semi-rigid base asphalt pavements and cold recycling asphalt pavement, flexible base asphalt pavement has better perform- ance on rutting resistance in high temperature area.