基于GPR三维正演技术的路面空洞含水率研究  

Research on Calculation Method of Pavement Cavity Water Content Based on GPR 3D Finite Element Forward Modeling Technology

作　　者：束裕 程博文 于晓贺 李冲[1,2] 罗蓉 SHU Yu;CHEN Bowen;YU Xiaohe;LI Chong;LUO Rong(Wuhan University of Technology, Wuhan,Hubei 430063, China;Hubei Provincial Highway Engineering Technology Research Center, Wuhan,Hubei 430063, China)

机构地区：[1]武汉理工大学,湖北武汉430063 [2]湖北省公路工程技术研究中心,湖北武汉430063

出　　处：《公路工程》2022年第3期82-88,111,共8页Highway Engineering

基　　金：湖北省交通运输厅科技项目(2020-2-1-2)。

摘　　要：目前,沥青路面早期水损害的问题随着高速公路的飞速发展显得尤其突出,在不同损伤阶段采取合适的养护措施十分重要,而判断其损伤程度的方法就是测量其内部的含水率。因此,为准确测量典型道路含水空洞病害的含水率,对汉十高速公路路面各结构层厚度信息进行收集,采用瑞利(Rayleigh)模型计算各层的相对介电常数,构建不同含水率条件下的道路空洞病害三维模型,从而建立含水空洞病害含水率与雷达反射波形的数学关联。结果表明,路面含水空洞的含水率与反射波幅呈线性关系,且可以通过反射波幅来反算含水率。该数值关系可以对已识别的道路含水空洞病害进行精细化分析,测定道路含水空洞病害的含水率,同时为道路结构无损检测与道路GPR正演技术的应用提供参考依据。At present,the problem of early water damage on asphalt pavements is particularly prominent with the rapid development of expressways.It is very important to take appropriate maintenance measures at different stages of damage,and the method to judge the degree of damage is to measure its internal moisture content.Therefore,in order to accurately measure the moisture content of the water-bearing cavity disease of typical roads,it is necessary to collect the thickness of each structural layer of the Han Shi Highway pavement,and use the Rayleigh model to calculate the relative permittivity of each layer to construct a 3D model of road cavity disease,thereby establishing the mathematical relationship between the water content of the water cavity disease and the radar reflection waveform.The results show that the water content of the pavement water-bearing cavity has a linear relationship with the reflected wave amplitude,and the water content can be inversely calculated by the reflected wave amplitude.This numerical relationship can perform refined analysis on the identified road water-bearing cavity disease,determine the water content of road water-bearing cavity disease,and provide a reference for the application of road structure non-destructive inspection and the GPR forward modeling technology.

关 键 词：探地雷达 道路检测 正演技术 含水率 相对介电常数 路面含水空洞 

分 类 号：U418.6[交通运输工程—道路与铁道工程]