水平移动荷载作用下沥青路面的永久变形

Permanent Deformation of Asphalt Pavement Under Horizontal Moving Load

为分析长大纵坡路段、城市交叉口或公交站台处沥青路面永久变形严重的原因,借助于有限元软件ABAQUS并编写了UTRACLOAD及DSLOAD子程序,计算了水平移动荷载作用下的沥青路面响应.研究结果表明:由水平剪切力引起的竖向永久变形和由正压力引起的竖向永久变形相比同样严重,均需严格控制;相同水平荷载作用下,随着荷载移动速度的加快,沥青路面结构体竖向永久变形的峰值逐渐减小,累积竖向永久变形也逐渐减小;水平移动荷载和其对应的作用时间对竖向永久变形的敏感性相当.

In order to find the cause of the severe asphalt permanent deformation in such sections as large longitudinal slope,traffic intersections and bus stations,the response of asphalt pavement to horizontal moving load is calculated with ABAQUS and its subroutine UTRACLOAD and DSLOAD.The results show that the vertical permanent deformations introduced by both the horizontal shear force and the vertical pressure are serious and need strictly control,that both the vertical permanent deformation amplitude and the cumulative permanent deformation of the pavement under the same horizontal load decrease with the acceleration of load moving,and that the sensitivity of horizontal moving load to vertical permanent deformation well matches that of the corresponding action time.