Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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A Sudy on the Underground Condition of Road Using 3D-GPR Exploration

3D-GPR탐사를 이용한 도로하부 지반상태에 대한 연구

  • Received : 2018.11.22
  • Accepted : 2019.01.22
  • Published : 2019.02.01
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Abstract

A study on the analysis of underground ground condition using 3D-GPR exploration was carried out in this paper. The test bed was constructed similar to the field, and the detection analysis was carried out for each depth of cavity and underground burial. Through this, we were able to know the permittivity of the ground by inversion, and we could confirm the depth of detection for the joint by accurate calculation. We confirmed the signal waveforms in the cavity under the road through 3D-GPR exploration, analyzed more quantitatively in subjective and empirical analysis. The subsidence and depth of the subsurface settlement can be observed through 3D-GPR survey, and ground condition change after the ground reinforcement can be confirmed through the exploration section.

3D-GPR탐사를 활용하여 도로하부 지반 상태 분석에 관한 연구를 수행하였다. 현장조건과 유사한 테스트베드를 조성하여 각 심도별 공동과 지중매설물에 대한 탐지 분석을 수행하였다. 이를 통해 지반의 유전율을 역산하여 파악하였고, 공동에 대한 탐지심도를 정확한 계산을 통해 확인할 수 있었다. 3D-GPR탐사를 통해 도로하부의 공동에 대한 신호파형을 확인하였고, 분석사의 경험적이고 주관적인 기존분석에 비하여 정량적인 분석방법 및 분석인자를 제시할 수 있었다. 도로하부의 지중침하에서도 3D-GPR탐사를 통해 침하분포 및 심도를 파악할 수 있었고, 지반보강 후 탐사해석단면을 통해 지반상태 변화를 확인하였다.

Keywords

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Fig. 2. 3D-GPR exploration TX, RX transmission and reception principle (Mirror:sweden)

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Fig. 1. A schematic diagram of exploration of single-channel GPR exploration

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Fig. 3. 3D-GPR exploration TX, RX transmission and reception principle

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Fig. 4. Road video camera and exploration location tracking system

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Fig. 5. Status of used GPR equipment

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Fig. 6. 3D-GPR exploration analysis program (Sinkhole Finder)

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Fig. 7. 3D-GPR TEST BED

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Fig. 8. 3D-GPR exploration in TEST BED

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Fig. 9. Shot signal waveform and image capture in 3D-GPR

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Fig. 10. GPR signal similar to a common signal waveform

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Fig. 11. Three-dimensional analysis of 3D-GPR exploration

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Fig. 12. Key factors for cavity analysis

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Fig. 13. Results of common signal waveform analysis after applying major factor

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Fig. 14. Crack in highway bridge abut

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Fig. 15. 3D-GPR exploration result in highway bridge abut

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Fig. 16. Ground reinforcement in settlement area

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Fig. 17. 3D-GPR exploration result in highway bridge abut after ground reinforcement

Table 1. Status and causes of road dumps in seoul (EA, Road management department of seoul city)

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References

  1. 서울시 보도자료, 2018년 10월 18일, "서울시, 도로관리과, 국정감사자료".
  2. Alan, V. O. and Alan, S. W. (1999), Signals and Systems, Prentice-Hall International, inc, pp. 394-395.
  3. Al-Qadi, I. L., Leng, Z. L. S. and Baek, J. (2014), In-Place Hot-Mix Asphalt Density Estimation Using Ground-Penetrating Radar, Transportation Research Record, Vol. 2152, pp. 19-27. https://doi.org/10.3141/2152-03
  4. Baek, J. and Choi, J. S. (2014), Investigation of substructure under the roads using ground penetrating radar (GPR), Road Engineers, Vol. 16, No. 2, pp. 11-16.
  5. Brian, R, Phelan. Marc, A, Ressler. Gregory, J, Mazzaro. Kelly, D, Sherbondy. Ram, M, Narayanan. (2013), Design of Spectrally Versatile Forward-Looking Ground Penetrating Radar for Detection of Concealed Targets, The International Society for Optics and Photonics, pp. 8714.
  6. David, J., Daniels. (1996), Surface penetrating radar, The Institution of Electrical Engineers, Vol. 8(4), pp. 165-182.
  7. Kim, Y. T., Kim, B., Kim, J. W. and Park, H. M. (2016), Determining the optimal frequency of ground penetrating radar for detecting voids in pavements, International Journal of Highway Engineering, Vol. 18(2), pp. 37-42. https://doi.org/10.7855/IJHE.2016.18.2.037
  8. Park, J. J., Han, J. G., Yoo, S. K. and Hong, K. G. (2015), GPR technology for exploring road cavity in the ground, Journal of the Korean geosynthetics society, Vol. 14(3), pp. 12-17.
  9. Yoon, J. J., Baek, J., Choi, Y. W., Choi, H. and Lee, C. M. (2016), "Signal pattern analysis of ground penetrating radar for detecting road cavities", Int. J. of Hig. Eng., Vol. 18, No. 6, pp. 61-67. 108 International. https://doi.org/10.7855/IJHE.2016.18.6.061
  10. Yoon, J. J., Baek, J. and Lee, C. M. (2018), Comparison of multichannel ground penetrating radar equipment for detecting road cavities, Int. J. of Hig. Eng., Vol. 20, No. 6, pp. 101-108. https://doi.org/10.7855/IJHE.2018.20.6.101

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