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为研究行车载荷和高温作用下沥青路面的变形演化规律,通过对沥青混合料高温粘弹性特性和行车载荷对路面作用的分析,提出采用修正Burgers模型作为沥青混合料的本构模型,对双轮标准轴载作用下高速公路沥青路面的应力场和变形场进行有限元分析.研究结果表明:路表竖向位移增加最快,沥青混合料发生了流变;面层内部水平应力变化剧烈,底基层底面水平拉应力最大;最大剪应力出现在轮迹两边的面层内部,影响范围主要集中在路面结构层内,沥青混合料发生应力松弛现象;竖向最大应力出现在路表轮迹处,轮迹下方区域内压应力呈衰减趋势分布,面层是产生路面车辙的主要区域.
In order to study the deformation and evolution of asphalt pavement under driving load and high temperature, the modified Burgers model is proposed as a constitutive model of asphalt mixture through the analysis of the high temperature viscoelastic properties of asphalt mixture and the effect of driving load on the pavement. The finite element analysis of stress field and deformation field of highway asphalt pavement under standard axle load shows that the vertical displacement of road surface increases fastest and that of asphalt mixture changes rheologically. The maximum horizontal tensile stress of the bottom surface of the grassroots is the largest. The maximum shear stress appears inside the surface layers on both sides of the wheel track. The influence range mainly concentrates in the pavement structure layer, and the stress relaxation occurs in the asphalt mixture. The compressive stress in the area below the track is distributed in a decreasing trend, and the surface area is the main area in which the road surface rutting occurs.