基于车辆加载实验的沥青路面动力响应分析

为研究车辆荷载作用下路面结构的动力响应,对沥青路面进行不同轴重,车速及不同的沥青层厚度条件下路面动力响应实测。结果表明:(1)柔性基层底部、下面层底部应变随车速增加而减小,随轴重增加而增大;(2)轴重相同时,下面层底部应变大于柔性基层底部应变;(3)下面层底部及柔性基层底部应变均随沥青层厚度增加而减小,厚度增加至23 cm时柔性基层底部应变不再显著降低;(4)基于层状弹性理论体系的计算结果与实测应变发展趋势并不一致,计算结果显示柔性基层底部应变大于下面层底部,拉应变随深度增加而增大,而实测结果表明最大应变并没有如计算那样出现在柔性基层底,而是出现在下面层底,因此经典层状弹性理论体系中以沥青混合料层底拉应变为最不利应变具有一定局限性。

Dynamic Response Analysis of Asphalt Pavement Based on Vehicle Loading Test

In order to study the dynamic response of pavement structure under vehicle load, we measured the dynamic response of pavement under different axle load, vehicle speed and different asphalt thickness. The results show that: 1) the strain at the bottom of flexible base decreases with the increase of speed, but increases with the increase of axle load. 2) when the axle load is the same, the strain at the bottom of lower layer is larger than that of the flexible base. 3) the strain at the bottom of the lower layer and the flexible base decreases with the increase of the thickness of the asphalt layer. When the thickness increases to 23cm, the strain at the bottom of the flexible base is no longer significantly reduced. 4) the calculation results based on elastic layered theory system and the development trend of the measured strain is not consistent, the calculation results show that the strain at the bottom of flexible base is greater than the strain at the bottom of the lower layer, the tensile strain increases with depth and the measured results show that the maximum strain does not appear as computing at the bottom of the flexible base instead of appearing at the bottom of lower layer. Therefore, according to the classical layered elasticity theory, it is considered that the strain at the bottom of asphalt mixture is the most unfavorable strain has some limitations.