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利用三维有限元计算工具,考虑沥青路面结构层不同的模量和厚度组合,结合实测的竖向轮胎-路面接地压力并考虑水平作用力,分析沥青路面结构层不同深度处的竖向应力脉冲波形。分析结果表明:同一沥青路面结构层不同深度处,不仅其竖向应力脉冲波形不相同,波长也不一样;也就是说,对同一路面结构不同深度处动态模量的确定,除了需要考虑不同的实验室加载波形和加载频率以外,还需要对荷载作用时间的取值做出修正。
The vertical stress pulse waveform at different depths of the asphalt pavement structure layer is analyzed with the combination of the measured vertical tire-pavement ground pressure and the horizontal force taking into account the different combinations of modulus and thickness of the asphalt pavement structure layer by using the three-dimensional finite element calculation tool . The analysis results show that not only the vertical stress pulse waveforms are different at different depths of the same asphalt pavement structure layer, but also the wavelengths are different. In other words, the determination of the dynamic modulus at different depths of the same pavement structure requires not only different Laboratory loading waveform and loading frequency, but also need to make changes on the value of the load acting time.