基于黏弹模型的交叉口路面力学响应分析

为研究交叉口路面在重载和水平荷载作用下的力学响应,考虑沥青混合料在高温时的黏弹特性,建立基于广义Maxwell的黏弹力学模型,探究温度、水平荷载、竖直荷载对路面最大剪应力的影响。文中基于SMA-13、AC-16、AC-20沥青混合料动态模量的试验数据,对黏弹有限元模型的参数进行标定,建立5项Prony级数的力学模型,对交叉口路面力学响应进行了分析。结果表明,最大剪应力峰值出现在路面的上中面层;在水平制动力影响下,路面最大剪应力的最不利荷载点位于荷载圆沿道路纵向的最前方,建议可在城市道路设计时增加最大剪应力控制点;路面的上、中面层对温度的变化更敏感。

Study on Mechanical Response of the Intersection Pavement Using Viscoelastic Model

In order to study the mechanical response of road intersection under heavy load and horizontal load,considering the viscoelastic properties of asphalt mixture at high temperature,a viscoelastic model based on generalized Maxwell was established,and the effect of temperature,horizontal load and vertical load on the maximum shear stress of the road surface was explored.Based on the dynamic modulus experimental data of SMA-13,AC-16 and AC-20 asphalt mixture,the parameters of viscoelastic finite module model were calibrated,the viscoelastic model of five prony series was established,and the mechanical response of intersection pavement was analyzed.The results show that the peak value of the maximum shear stress is in the wearing layer and intermediate layer of the pavement,and the most unfavorable load point of the maximum shear stress of the pavement is located in front of the load center under the influence of horizontal force,and it is suggested that the maximum shear stress control point can be added in the urban road design as the upper and middle surface layer of the pavement is more sensitive to the change of temperature.