International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Signal Pattern Analysis of Ground Penetrating Radar for Detecting Road Cavities

도로동공 탐지를 위한 지표투과레이더의 신호패턴에 관한 연구

  • 윤진성 (서울특별시 품질시험소 도로포장연구센터) ;
  • 백종은 (서울특별시 품질시험소 도로포장연구센터) ;
  • 최연우 (서울특별시 안전총괄본부 도로관리과 도로관리팀) ;
  • 최현 (서울특별시 안전총괄본부 도로관리과 도로관리팀) ;
  • 이창민 (서울특별시 품질시험소 도로포장연구센터)
  • Received : 2016.09.19
  • Accepted : 2016.11.30
  • Published : 2016.12.15
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Abstract

OBJECTIVES : The objective of this study is to detect road cavities using multi-channel 3D ground penetrating radar (GPR) tests owned by the Seoul Metropolitan Government. METHODS : Ground-penetrating radar tests were conducted on 204 road-cavity test sections, and the GPR signal patterns were analyzed to classify signal shape, amplitude, and phase change. RESULTS : The shapes of the GPR signals of road-cavity sections were circular or ellipsoidal in the plane image of the 3D GPR results. However, in the longitudinal or transverse direction, the signals showed mostly unsymmetrical (or symmetrical in some cases) parabolic shapes. The amplitude of the GPR signals reflected from road cavities was stronger than that from other media. No particular pattern of the amplitude was found because of nonuniform medium and utilities nearby. In many cases where road cavities extended to the bottom of the asphalt concrete layer, the signal phase was reversed. However, no reversed signal was found in subbase, subgrade, or deeper locations. CONCLUSIONS : For detecting road cavities, the results of the GPR signal-pattern analysis can be applied. In general, GPR signals on road cavity-sections had unsymmetrical hyperbolic shape, relatively stronger amplitude, and reversed phase. Owing to the uncertainties of underground materials, utilities, and road cavities, GPR signal interpretation was difficult. To perform quantitative analysis for road cavity detection, additional GPR tests and signal pattern analysis need to be conducted.

Keywords

References

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