지질공학 (The Journal of Engineering Geology)

  • 제23권3호
  • /
  • Pages.235-246
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  • 2013
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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저주파 결함 탐지기를 활용한 화순 운주사 광배석불의 풍화상태 분석

Analysis of Weathered State on a Halo Stone Buddha, Unju Temple of Hwasun, Korea Using Low Frequency Flaw Detector

  • 강성승 (조선대학교 에너지자원공학과) ;
  • 고진석 (조선대학교 에너지자원공학과) ;
  • 김정빈 (순천대학교 물리교육과) ;
  • 장보안 (강원대학교 지구물리학과)
  • Kang, Seong-Seung (Department of Energy and Resources Engineering, Chosun Univeristy) ;
  • Ko, Chin-Surk (Department of Energy and Resources Engineering, Chosun Univeristy) ;
  • Kim, Cheong-Bin (Department of Physics Education, Sunchon National University) ;
  • Jang, Bo-An (Department of Geophysics, Kwangwon National University)
  • 투고 : 2013.07.31
  • 심사 : 2013.08.30
  • 발행 : 2013.09.30
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초록

화순 운주사 내 광배석불에 대한 풍화상태를 분석하기 위하여 저주파 결함 탐지기를 활용하여 종파속도를 측정하였다. 석불과 같은 암종인 신선한 산성응회암의 실내시험 결과 평균흡수율은 5.38%, 평균종파속도는 4,008 m/s, 평균일축압축강도는 70.1 MPa로서 보통암에 해당되었다. 저주파 결함 탐지기에 의해 측정된 석불의 평균종파속도는 왼쪽 영역이 2,257 m/s, 오른쪽 영역이 3,347 m/s이며, 석불 전체영역의 평균종파속도는 2,802 m/s로 나타났다. 대상 석불에 대한 풍화지수 계산 결과, 평균풍화지수는 왼쪽 영역이 0.45, 오른쪽 영역이 0.21이었고, 석불 전체의 풍화지수는 0.33으로 나타났다. 석불의 결과를 실내시험 결과와 비교해 볼 때, 석불의 풍화상태는 왼편이 상당한 풍화, 오른편이 보통풍화로 분석되며, 더군다나 석불의 왼쪽 영역이 오른쪽 영역보다 더 많은 풍화작용을 받았음을 지시한다. 전체적으로 대상 석불은 풍화등급분류 중 보통풍화상태에 해당된 것으로 판단된다. 결론적으로, 표면상태가 고르지 못한 석조문화재의 종파속도 분석에 있어서 저주파 결함 탐지기가 유용하게 적용될 수 있을 것으로 기대된다.

P-wave velocity was measured by the low frequency flaw detector in order to analyze the weathered state of a halo stone Buddha, Unju temple, Hwasun, Korea. By the results of laboratory tests on a fresh acidic tuff with the same rock of a halo stone Buddha, average absorption, average P-wave velocity, and average uniaxial compressive strength were 5.38%, 4,008 m/s, and 70.1 MPa, respectively. The results correspond to moderately strong rock. Average P-wave velocity of a halo stone Buddha measured by the low frequency flaw detector was 2,257 m/s in the left zone, 3,437 m/s in the right zone, and 2,802 m/s overall. Weathering index of a halo stone Buddha was 0.45 in the left zone, 0.21 in the right zone, and 0.33 overall. Comparing the results of a halo stone Buddha with them of laboratory tests, weathered state of a halo stone Buddha was analyzed highly weathered state in the left zone and moderately weathered state in the right zone. Furthermore, it suggests that the left zone of a halo stone Buddha was affected weathering more than the right one. Overall a halo stone Buddha corresponds to moderately weathered state of weathering degrees. In conclusion, it is considered that low frequency flaw detector may be applicable as a valuable method on analyzing the P-wave velocity of the stone cultural heritage with an irregular surface.

키워드

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피인용 문헌

  1. 화순 운주사 마애여래좌상의 암석학적 특성 및 손상도 평가 vol.33, pp.1, 2013, https://doi.org/10.12654/jcs.2017.33.1.01