道路病害探地雷达模型试验与GprMax正演模拟

Model Test of Road Disease Ground Penetrating Radar and Forward Simulation of GprMax

摘要: 在试验模型箱中预埋了不同材质、不同填充物的目标体，利用探地雷达扫描并研究雷达波形图。采用金属管道和PVC管道两种材质，观察雷达反射波形图差别：金属管道反射波较PVC管道反射波强烈，探测目标体位于金属管道下方时会受到强烈干扰甚至无法探测，因此建议做模型试验时避免采用金属材质，尽量减少信号干扰提高雷达图像质量。采用空洞充水和充气探测的结果表明相对介电常数是影响雷达图像的关键因素之一。通过不同尺寸模型箱模拟不同大小的空洞病害，对相应雷达波形图进行分析，用GprMax编程软件对道路不同大小空洞病害进行正演模拟并分析模拟图。

Abstract: Target bodies with different materials and fillers are embedded in the test model box, and radar waveform is scanned and studied by GPR. This paper uses metal pipes and PVC pipes to observe the difference in radar reflection waveforms: the reflected wave of metal pipes is stronger than that of PVC pipes. When the detection target is under the metal pipe, it will be strongly interfered or even unable to be detected. Therefore, it is recommended to avoid using metal materials when doing model tests to minimize signal interference and improve radar image quality. The results of water-filling and gas-filled detection show that the relative dielectric constant is one of the key factors affecting radar images. Model boxes of different sizes are used to simulate cavity diseases of different sizes, and corresponding radar waveforms are analyzed. GprMax programming software is used to carry out forward simulation of cavity diseases of different sizes on the road and analyze simulation diagrams.