基于不同层间接触状态的就地热再生沥青路面力学响应分析

Mechanical Response Analysis of Hot In-place Recycling Asphalt Pavement Based on Different Interlayer Contact Conditions

就地热再生沥青路面由于其施工工艺的特殊性,其层间接触界面一直是沥青路面结构的薄弱点.利用Abaqus建立路面结构三维空间几何模型,并考虑再生层接触状态和施工厚度对路面力学响应的影响,研究路面结构力学响应的变化特性.结果表明:摩擦接触模型的力学响应均大于完全连续模型力学响应,但完全连续模型并不能完全表征路面的实际接触状态;再生层接触状态对路面结构竖向变形几乎没有影响,但对最大剪应力和再生层层底拉应力均有显著影响.基于有限元接触理论阐述了层间接触状态对沥青路面的重要性,对就地热再生沥青路面设计及施工具有参考价值.

Due to the particularity of heating technology of hot-in-place recycling,the interlayer contact interface has always been the weak point of asphalt pavement structure.The three-dimensional spatial geometric model of pavement structure is established with Abaqus,and the influence of the contact state and the thickness of the regenerated layer on the mechanical response of the pavement is considered to study the change characteristics of the mechanical response of the pavement structure.The results show that the mechanical response of the friction contact model is greater than the mechanical response of the fully continuous model,but the fully continuous model cannot completely represent the actual contact state of the pavement.The contact conditions of recycled layer has little effect on the vertical deformation of pavement structure,but has a significant effect on the maximum shear stress and the tensile stress at the bottom of recycled layer.Based on the finite element contact theory,the significance of the interlayer contact conditions is expounded to the asphalt pavement in this paper,which is of reference value for the design and construction of the hot In-place recycling asphalt pavement.