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结合京珠高速公路某路段的现场路面温度实测结果,运用三维有限元方法,重点分析了不同道路纵坡、不同应力场情况下,上坡路段路面结构在水平和竖向荷载综合作用时,其最大拉应力、最大剪应力和最大路表弯沉的变化规律。分析结果表明,道路纵坡改变只对面层所受应力有较大影响,且只在距路表2 cm深度范围内存在拉应力;高温温度场的存在虽然不会明显加大上坡路面结构各层的拉应力和剪应力,但会使路表弯沉明显增大,容易导致车辙破坏。对京珠高速公路某路段车辙病害展开现场调查,调查发现该路段严重的车辙变形60%是由中面层产生,其余40%是由上面层和下面层产生,即车辙大多来源于中面层。最后,提出了上坡路段沥青路面结构设计建议,还据此进行面层混合料设计,且铺筑了试验路。所设计的沥青路面车辙发展缓慢,能适应炎热环境温度下长大纵坡的道路交通。
Based on the field pavement temperature measurement results of a section of the Beijing-Zhuhai Expressway, three-dimensional finite element method is used to analyze the effect of pavement structure on the uphill slope under the combination of horizontal and vertical load with different longitudinal and slope conditions. Tensile stress, maximum shear stress and maximum deflection of the road surface. The analysis results show that the change of road longitudinal slope only has a significant influence on the stress of the surface layer, and only exists the tensile stress in the depth range of 2 cm away from the road surface. Although the existence of high temperature temperature field does not obviously increase the layers of the ascending pavement structure Of the tensile stress and shear stress, but will make the road surface deflection significantly increased, easily lead to rut damage. A survey of rutting diseases on a section of the Beijing-Zhuhai Expressway has been carried out. The survey found that 60% of the serious rutting deformation of the section is produced by the middle layer and the remaining 40% is generated by the upper layer and the lower layer, that is, rut mostly comes from middle layer . Finally, the design proposal of asphaltic surface structure of uphill section is put forward, and the design of the surface mixture is also carried out according to this, and the test road is paved. The designed rutting of asphalt pavement is slow, which can adapt to the road traffic which grows up along the longitudinal wall in the hot environment.