不同层间接触状态下沥青路面动力响应分析

Dynamic Response Analysis of Asphalt Pavement Based on Different Interlayer Contact

在考虑路面结构层间接触的情况下,采用ANSYS建立路面结构三维有限元模型,通过编写APDL程序,分析了在行车速度为匀加速、匀减速和匀速状态下路面结构的动力响应规律。研究结果表明:在3种不同行驶状态下,随着层间接触系数的增大,路面结构各层的最大竖向剪应力呈增大趋势,路面结构各层的横向最大剪应力呈减小趋势,路面结构各层的X向、Z向拉应力、拉应变都呈减小趋势,说明良好的层间结合状态可以提高沥青面层的抗疲劳开裂能力。

When considering the contact between layers of pavement structure,the asphalt pavement finite element model is established by means of the software ANSYS,and APDL program is written to analyze the dynamic response rules of pavement structure in the state of uniform acceleration,d eceleration and uniform speed.The results show that:under three different driving conditions,the maximum vertical shear stress of each layer of the pavement structure increases with the increase of the inter-layer contact coefficient;the transverse maximum shear stress of each layer of pavement structure decreases;and the X-strain and Z-strain of each layer of the pavement structure shows a decreasing trend.Therefore,agood interlayer bonding state can improve the anti-fatigue cracking capability of asphalt surface layer.