Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Detection of Cavities Behind Concrete Walls Using a Microphone

마이크로폰을 이용한 콘크리트 벽체 배면의 공동 탐사

  • Kang, Seonghun (Hyper-converged Forensic Research Center for Infrastructure, Korea Univ.) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Han, WooJin (Future and Fusion Lab of Architectural, Civil and Environmental Engrg., Korea Univ.) ;
  • Kim, Sang Yeob (Future and Fusion Lab of Architectural, Civil and Environmental Engrg., Korea Univ.) ;
  • Yu, Jung-Doung (Department of Civil Engrg., JoongBu Univ. (Inno Campus))
  • 강성훈 (고려대학교 초융합건설포렌식연구센터) ;
  • 이종섭 (고려대학교 건축사회환경공학부) ;
  • 한우진 (고려대학교 미래건설환경융합연구소) ;
  • 김상엽 (고려대학교 미래건설환경융합연구소) ;
  • 유정동 (중부대학교 토목공학과)
  • Received : 2022.09.06
  • Accepted : 2022.11.23
  • Published : 2022.12.31
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Abstract

Cavities behind concrete walls can adversely affect the stability of structures. Thus study aims to detect cavities behind concrete structures using a microphone in a laboratory model test. A small-scale concrete wall is constructed in a chamber, which is composed of a reinforced concrete plate and dry soil. A plastic bowl is then placed between the plate and soil to simulate a cavity behind the concrete structure. Leaky surface acoustic waves are generated by impacting the concrete plate using a hammer and are measured using a microphone. The measured signals are analyzed using natural frequencies, and cavity-free sections are evaluated. The test results show that the first natural frequency decreases at the cavity section due to the flexural vibration behavior of the plate. In addition, the amplitude corresponding to the first natural frequency decreases as the measurement location becomes farther from the cavity center and significantly decreases at the measurement locations near the rebars. This study demonstrates that a microphone may be useful to detect cavities behind concrete walls.

벽체 배면에 발생한 공동은 벽체의 안정성에 악영향을 줄 수 있다. 본 연구의 목적은 실내 실험을 통해 콘크리트 벽체 배면에 발생한 공동을 마이크로폰을 이용하여 평가하는 방법을 개발하는 것이다. 철근이 매설된 콘크리트 판과 건조토를 이용하여 콘크리트 벽체 구조물과 배면의 흙을 모사하였으며, 속이 빈 반구형 플라스틱 통을 콘크리트 판과 건조토 사이에 설치하여 벽체 배면의 공동을 모사하였다. 누설 탄성 표면파는 해머로 콘크리트 판을 타격하여 발생시켰으며, 마이크로폰을 이용하여 측정하였다. 획득한 마이크로폰 신호의 고유주파수를 분석하여 공동이 존재하는 구역을 평가하였다. 공동이 존재하는 구역에서는 콘크리트 판의 굽힘 진동 거동에 의하여 1차 고유주파수가 감소하였다. 또한 1차 고유주파수에 해당하는 진폭은 공동에서 멀어질수록 감소하였으며, 철근에 인접한 측점에서는 더 큰 감소폭을 보였다. 본 연구는 마이크로폰이 콘크리트 벽체 배면에 발생한 공동의 위치를 평가하기 위해 유용하게 이용될 수 있음을 보여준다.

Keywords

Acknowledgement

본 연구는 국토교통부 국토교통과학기술진흥원 '지하공간 활용 도시기반 복합플랜트 실증연구 사업'의 "환경기초 복합플랜트 지하공간 활용 기술(과제번호: 22UGCPB157945-03)" 과제에 의해 수행되었으며 이에 감사드립니다.

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