Investigation of ground cavity using ground penetrating radar

Won Taek Hong, Seonghun Kang, Woo Jin Han, Jong-Sub Lee

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

As cavities in the ground may cause severe settling and sinkholes, an accurate investigation of ground cavities is essential. Recently, the use of ground penetrating radar (GPR) has actively increased because the GPR survey allows the investigation of a wide area within a short time. However, an error can occur in the results of the GPR survey because the GPR survey produces only the interface between layers with different electromagnetic impedances. In this study, the characteristics of the electromagnetic wave reflected from the ground cavity were experimentally identified. To artificially create a cavity, a frozen carbon dioxide cube was buried in a ground specimen and sublimated, and endoscopic images were then taken to make sure the artificially created cavity was maintained. The GPR survey was conducted on the ground specimen at a survey distance of 2 m. As a result, the cavity was observed at the location where the frozen carbon dioxide was buried. In addition, the result of the GPR survey shows that the polarity of the electromagnetic wave reflected from the cavity is the reverse of the polarity from the first strong signal. The characteristic of the reflected electromagnetic wave identified in this study may be effectively used for investigation of ground cavities.

Original languageEnglish
Pages935-938
Number of pages4
Publication statusPublished - 2017 Jan 1
Event19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017 - Seoul, Korea, Republic of
Duration: 2017 Sep 172017 Sep 22

Other

Other19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017
CountryKorea, Republic of
CitySeoul
Period17/9/1717/9/22

Keywords

  • Electromagnetic wave
  • Ground cavity
  • Ground penetrating radar
  • Polarity
  • Reflection coefficient

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Hong, W. T., Kang, S., Han, W. J., & Lee, J-S. (2017). Investigation of ground cavity using ground penetrating radar. 935-938. Paper presented at 19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017, Seoul, Korea, Republic of.