In this study, the applications and the limitations of the Ground-penetrating radar (GPR) investigation have been addressed with the main objective of improving the efficient GPR application of subsurface surveys on Korean expressways. The depth of investigation and detection performance of anomalous objects have been studied using two different types of multichannel GPR on the Korean Expressway Corporation’s nondestructive testing testbed for subsurface detection. Based on the field survey, it was found that utilizing the plane view by depth, cross-sectional and longitudinal profile data of the multichannel GPR simultaneously, analysis and evaluation of the GPR signals are more efficient and practical. Although there was a difference in the frequency of use, the precision difference between two GPR is almost similar in the investigation depth and detection performance of the pavement subsurface anomaly. Under an asphalt concrete standard pavement section, the effective depth of cavity detection is 1–1.5 m, while detection under concrete pavement is less than 1.0 m. In addition, there is still a need to calibrate depths using field cores when constructing a 3D underground facility map.

中文翻译：

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GPR调查在韩国高速公路地下勘测中的应用及局限性研究

在这项研究中，探地雷达（GPR）研究的应用和局限性已得到解决，其主要目的是提高在韩国高速公路上进行地下勘测的有效GPR应用。在韩国高速公路公司用于地下探测的非破坏性测试平台上，使用两种不同类型的多通道GPR对异常物体的调查深度和探测性能进行了研究。基于现场调查，发现同时利用多通道GPR的深度，横截面和纵向轮廓数据的平面视图，GPR信号的分析和评估更加有效和实用。尽管使用频率有所不同，两个GPR的精度差异在路面深度异常的调查深度和检测性能上几乎相似。在沥青混凝土标准路面下，空腔检测的有效深度为1–1.5 m，而在混凝土路面下的检测深度小于1.0 m。另外，在构建3D地下设施图时，仍然需要使用场核心来校准深度。