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논문 기본 정보

자료유형
학술저널
저자정보
김동혁 (인하대학교 공과대학 토목공학과) 김종명 (인하대학교 공과대학 토목공학과) 최민규 (인하대학교 공과대학 토목공학과) 정진훈 (인하대학교 공과대학 사회인프라공학과)
저널정보
한국도로학회 한국도로학회논문집 한국도로학회논문집 제20권 제6호
발행연도
2018.1
수록면
41 - 50 (10page)

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PURPOSES : The purpose of this study is to verity the applicability of a portable small-loop electromagnetic survey method to underground cavity detection. METHODS: In order to evaluate applicability of the method, a test bed comprised of four sections was constructed. The two sizes of the four cavities artificially formed at two depths were contained in the test bed. Each cavity was positioned at center of each 6 m long section. Four types of pavement materials such as unpaved ground, bricks, asphalt, and concrete were used at every section. The portable small-loop electromagnetic device measured electrical conductivity as an exploration signal that varied according to the electrical properties underground. The electrical conductivity was converted into two-dimensional electrical resistivity distribution sections using an inverse analysis program. RESULTS : The results showed that the electrical resistivity of the non-cavity area was lower than that of the cavity area. The electrical resistivity increased as the measurement device moved closer to the cavity position. It was also found that the electrical resistivity values were not significantly affected by pavement type. The small cavity with diameter of 35 cm could be detected up to 1.2 m depth. CONCLUSIONS : Therefore, it was verified that the portable small-loop electromagnetic survey method is applicable to the detection of cavities in sections where ground subsidence is expected. This method can be effectively used for small-scale roads such as sidewalks, parkways, and side streets where large exploration equipment cannot enter.

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