地质雷达检测道路结构的理论及应用分析

Theory and application of prospecting pavement structure by ground-penetrating radar

探讨地质雷达在道路无损检测应用上的基本原理和雷达波传播速度计算的常规方法 ,进一步分析道路结构及其电磁波的反射特性 ,以及如何根据已知的雷达资料计算道路的各种结构参数 ,这对实际工作具有一定的指导意义 .此外 ,针对地质雷达实际波形的复杂性 ,指出了常规反演方法满足不了当前道路无损检测的精度要求的缺陷 ,为此 ,提出了特定的处理方法———振幅补偿法 ,并在长益高速公路、长沙绕城路等路段得到应用 .结果表明 :作者采用的方法是实际可行的 ,可满足目前道路工程无损检测的要求 。

This paper analyzes the principle of ground penetrating radar(GPR) for non destructive prospecting of pavement and explains the conventional method of velocity calculation of radar waves. The paper presents the pavement′s structure and characterization of radar waves reflection. How to figure structural parameters of pavement from GPR data has also been presented. Because of the complexity of radar waves in practice, it is pointed out that the conventional methods can not meet the precision requirement of pavement structure prospecting. Therefore, we present a new amplitude compensation method. Its application in the construction of Changsha Yiyang speedway and Changsha circle road has shown that this method satisfies the demands of non destructive prospecting in engineering, and can be used widely.