层间接触状态和横向力大小对车辙贡献率的影响

Influence of interlayer contact state and lateral tire-pavement contact pressure on rutting contribution rate

车辙贡献率是反映沥青路面各结构层车辙病害程度的一个主要参数,可用于指导沥青路面的设计和施工.利用三维有限元计算软件建立三维有限元模型用于理论分析,将有限元计算结果与理论解进行对比,验证了该三维有限元模型的可靠性.采用实测的轮胎接地压力,考虑不同层间接触状态和横向力大小,结合有限元计算的数据,分析了沥青路面结构层的车辙贡献率.结果表明:在层间完全连续状态下,横向力大小的选取不能简单地选取最大垂直轮胎接地压力的一定比例,而是要根据所研究的具体情况具体分析.在对沥青路面车辙贡献率的研究中,可以忽略层间接触状态,即假定层间完全连续.

The rutting contribution rate, as a main parameter which can reflect the degree of rutting disease of each structural layer on asphalt pavement, can be used to guide the design and construction of asphalt pavement. In this paper, the three-dimensional finite element calculation software was used to establish three-dimensional finite element model for theoretical analysis. With the comparison of the result of the finite element calculation with the theoretical solution, the reliability of the 3D finite element model was verified. Considering the different interlayer contact state and the lateral force, the rutting contribution rate of Asphalt Pavement was analyzed by using the data of measured tire contact pressure and finite element calculation. According to the results, if the interlayer is completely continuous, the size of lateral force can not be simply decided by a certain proportion of the largest vertical value of tire grounding pressure, instead, it should be analyzed on the specific situation. The interlayer contact condition can be ignored in the research of rutting contribution rate on asphalt pavement, that is, the interlayer contact condition can be assumed completely continuous.