Abstract
Technique for Detecting Subsurface Cavities of Urban Road Using Multichannel Ground-penetrating Radar Equipment
Highlights
As cities have developed and their underground structure has become complicated with aging parts, accidents, such as a vehicle or pedestrian falling through roads, due to the subsidence or sinking of downtown road surfaces, have emerged as a significant social problem in recent years
For a comparative analysis of the four types of multichannel ground-penetrating radar (GPR) equipment used in Seoul, the same section was investigated with each type of equipment
As a result of analyzing the GPR signals applied in this study, we found that the ratio of cavities with phase reversal in the upper part of the cavity was 62% but there were many exceptions
Summary
As cities have developed and their underground structure has become complicated with aging parts, accidents, such as a vehicle or pedestrian falling through roads, due to the subsidence or sinking of downtown road surfaces, have emerged as a significant social problem in recent years With these phenomena continuing to occur and mass media reports, citizens’ anxiety has grown, making this problem a social issue, and various measures have been taken. As part of the measures to avoid subsidence in advance, equipment and technology have been developed and introduced to detect cavities below the road surface, with surveying for subsurface cavities carried out since July 2015 Such surveying in city centers is performed nondestructively using ground-penetrating radar (GPR).(1) GPR is widely used and established as a type of electromagnetic sensor. To improve the reliability of the detection and analysis technology, it is necessary to improve the analysis technology based on quantitative analysis by acquiring a large amount of cavity data and analysis experience
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