新老路面结构拼接部位的受力状态分析

在道路拓建工程中,新老路面在结构层模量上存在差异,使得拼接结构在拼接部位的受力极为不利。根据新老路面结构组成形式、荷载条件,采用有限元方法,分析新老路面各个结构层模量差异对拼接部位受力状态的影响。结果表明:在新老路面结构中,新老面层、新老基层的模量差异对拼接部位的受力有着显著的影响,当保留老面层和老基层时应确保其具有足够的剩余强度(模量)。在最不利荷载工况下,如果要使得拼接结构拼接面上的剪应力增加不超过10%,新老面层、新老基层的模量差异应不超过30%～40%。

An Analysis on the Force Bearing State of the Jointing Position of New-old Pavement Structure

In road expanding project, there are differences in the modulus of each layer structure of new-old pavement,which makes the force bearing at the jointing position of the splicing structure extremely unfavorable. The influence of the modulus variance of each layer structure on the force bearing state of the jointing position is analyzed according to different forms of new-old pavement structure. The results shows that the modulus variance of surface layer has obvious effect on the force beating of jointing position, and enough residual strength（modulus） should be assured when old sur- face layer and old base are reserved. Given the least favorable load case, if the shear stress increase in the jointing plane of the spliced structure needs to be limited under 10%, the modulus variance of new-old surface layer and base should not exceed 30%-40%.