基于三维探地雷达的沥青路面介电常数检测方法对比研究

Comparative Study of Dielectric Constant Detection Methods for Asphalt Pavement Based on 3D ground Penetrating Radar

本文通过三维探地雷达发射电磁波在不同介质的传播速度不同的性质来对道路的介电常数进行检测,分别运用三种介电常数检测方法(钻芯取样法、振幅全反射法与共中心点法)来计算道路介电常数,通过对比三种检测方法来得出三维探地雷达用于沥青路面介电常数检测的最佳方法。通过试验得出结论:振幅全反射法受环境因素影响较大;钻芯取样法仅能得出整条道路的部分数据,检测不够全面;共中心点法可以无损地得出整条道路数据,但不够准确。结合共中心点法与钻芯取样法,以钻芯取样法计算的结果为准,通过修正共中心点法可对沥青路面介电常数进行快速准确地检测。

In this paper,the dielectric constant of the road is measured by the properties of the propagation velocity of the electromagnetic wave emitted by the 3D ground penetrating radar in different media.Three kinds of dielectric constant detection methods(core sampling method,amplitude total reflection method and common center point method)are used to calculate the road dielectric constant.By comparing the three detection methods,the best method of three-dimensional ground penetrating radar for asphalt pavement dielectric constant detection is obtained.Through the experiment,the conclusion is drawn:Amplitude total reflection method is greatly affected by environmental factors.The core-drilling sampling method can only obtain partial data of the whole road,so the detection is not comprehensive enough.The common central point method can get the whole road data lossless,but it is not accurate enough.Combined with the common center point method and the drill core sampling method,the dielectric constant of asphalt pavement is measured quickly and accurately by modifying the common center point method.