International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Preliminary Evaluation of Subsurface Cavity and Road Cave-in Potentials Based on FWD Deflections

FWD 처짐량 기반 도로 공동 및 함몰 위험도 평가 기초 연구

  • 김태우 (서울특별시 품질시험소 도로포장연구센터) ;
  • 윤진성 (서울특별시 품질시험소 도로포장연구센터) ;
  • 이창민 (서울특별시 품질시험소 도로포장연구센터) ;
  • 백종은 (서울특별시 품질시험소 도로포장연구센터) ;
  • 최연우 (서울특별시 도로관리과 도로관리팀)
  • Received : 2017.08.10
  • Accepted : 2017.09.13
  • Published : 2017.10.16
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Abstract

PURPOSES : The objective of this study is to evaluate the potential risk level of road cave-ins due to subsurface cavities based on the deflection basin measured with falling weight deflectometer (FWD) tests. METHODS: Ground penetrating radar (GPR) tests were conducted to detect road cavities. Then FWD tests were conducted on 13 pavement test sections with and without a cavity. FWD deflections and a deflection ratio was used to evaluate the effect of geometry of the cavity and pavement for road cave-in potentials. RESULTS : FWD deflection of cavity sections measured at 60 cm or a closer offset distance to a loading center were 50% greater than more robust sections. The average deflection ratio of the cavity sections to robust sections were 1.78 for high risk level cavities, 1.51 for medium risk level cavities, and 1.16 for low risk level cavities. The relative remaining service life of pavement with a cavity evaluated with an surface curvature index (SCI) was 8.1% for the high level, 21.8% for the medium level, and 89.8% compared to pavement without a cavity. CONCLUSIONS : FWD tests can be applied to detect a subsurface cavity by comparing FWD deflections with and without a cavity measured at 60 cm or a closer offset distance to loading center. In addition, the relative remaining service life of cavity sections based on the SCI can used to evaluate road cave-in potentials.

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References

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