不同层间黏结状态下沥青路面结构的力学特性分析

Mechanical characteristics analysis of asphalt pavement structure in different interlayer bonding states

为探索不同黏结状态下沥青路面结构力学特性,借助ABAQUS建立半刚性基层沥青路面结构有限元模型,设定3种层间黏结状态,对4个关键力学响应指标的结构深度方向分布规律分析。研究表明,最大剪应力峰值指标对于层间黏结状态变化较为敏感,相较于完全连续状态,其他2组模型分别增大了63.0%、92.6%,在沥青面层层间、面基层层间的3个界面最大剪应力出现峰值。在底基层层底的水平拉应力随着黏结状态的减弱逐渐变收紧并且集中分布在轮载中间位置处,拉压应力交界处出现在基层处,还分析了竖向压应变与路表弯沉的结构深度方向响应规律。进一步解析了层间演化条件下的路面结构内部的力学响应规律,可合理指导路面结构设计,提高耐久性水平。

In order to explore the structural and mechanical characteristics of asphalt pavement under different bonding states,this study uses ABAQUS to establish finite element model of semi-rigid base asphalt pavement structure.The study showed that the maximum shear stress peak index was more sensitive to the change of bond state between layers.Compared with the full continuous state,the other two models increased by 63.0%and 92.6%respectively.The horizontal tensile stress at the bottom of the substrate layer tightens gradually with the weakening of the bond state and is concentrated in the middle of the wheel load.The tensile stress junction appears at the grassroots level.This study further analyzes the mechanical response law in pavement structure under the condition of interlayer evolution,which can guide pavement structure design and improve durability.