三维步进频率探地雷达在沥青层厚度检测中的应用

The realization of applying 3D frequency stepped ground penetrating to the detection of asphalt layer thickness

目前应用于道路沥青层厚度检测的探地雷达主要为1GHz以上的高频单通道天线,检测覆盖范围小,存在以线代面的问题。为了在兰州市市政道路工程竣工验收中实现沥青层厚度全覆盖无损检测,采用三维步进频率空耦探地雷达结合钻芯量厚验证其在沥青层厚度检测中的可靠性。文中通过分析步进频率探地雷达系统的工作原理和深度分辨率,并根据三维步进频率探地雷达的实验结果和验收实例,说明其适用于道路沥青层厚度检测,并具有直观、高效、分辨率高等特点。

Because of its non-destructive and high-resolution characteristics,ground penetrating radar technology has been widely used in road nondestructive testing in recent years.The ground penetrating radar currently used for road asphalt layer thickness detection is mainly a high frequency single channel antenna above1 GHz;compared with the traditional core sampling,it has the advantages of non-destruction and high efficiency,but its detection coverage is small,and there is a problem of line generation.In order to realize the full coverage non-destructive testing of asphalt layer thickness in the completion acceptance of Lanzhou municipal road project,the authors used three-dimensional stepped frequency space-coupled ground penetrating radar combined with the core thickness to verify its reliability in asphalt layer thickness detection.The authors analyzed the working principle and depth resolution of the stepped-frequency ground penetrating radar system and,based on the experimental results and acceptance examples of the three- dimensional stepped-frequency ground penetrating radar,consider that it is suitable for road asphalt layer thickness detection,and has the characteristics of intuitiveness,high efficiency and high resolution.