全厚式沥青路面层间接触状态数值模拟

Numerical Simulation for Interface Contact Condition of Full-depth Asphalt Pavement

路面各层间的接触状态直接影响着路面的使用性能。通过有限元仿真模拟全厚式沥青路面不同的层间接触状态,并采用路表弯沉、沥青层底拉应变以及土基顶压应变3大指标分析其对路面寿命的影响。计算结果表明,对于全厚式路面来说,基层与底基层之间保持连续比面层与基层之间保持连续更为重要。根据路表弯沉计算最大路面寿命,若沥青稳定基层与底基层之间是不连续的,则其路面寿命由沥青层底拉应变决定;反之,路面寿命则由土基顶压应变决定。

Pavement interface contact condition directly influences pavement performance. The article simulated the interface condition of full-depth pavement through finite element method, and studied its influence on pavement life using three indexes including the deflection on the surface, the tensile strain at the bottom of asphalt layer and the compressive strain at the top of subgrade. The result shows that for full-depth pavement, the interface between base and subbase keeping continuous is more important than between surface and base. The life calculated by the deflection on the surface is largest. If the interface between asphalt stabilized base and subbase is discontinuous, the pavement life is determined by the tensile strain at the bottom of asphalt layer, conversely, by the compressive strain at the top of subgrade.