지질공학 (The Journal of Engineering Geology)

  • 제22권3호
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  • Pages.353-363
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  • 2012
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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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울릉도 북동부 지역의 낙석재해 위험도 평가

Assessement of Rockfall Hazard in the Northeast Region of Ulleung-Do

  • 서용석 (충북대학교 지구환경과학과) ;
  • 장형수 (충북대학교 지구환경과학과) ;
  • 김광염 (한국건설기술연구원 Geo-인프라연구실)
  • Seo, Yong-Seok (Department of Earth and Environmental Sciences, Chungbuk National University) ;
  • Jang, Hyung-Su (Department of Earth and Environmental Sciences, Chungbuk National University) ;
  • Kim, Kwang-Yeom (Geotechnical Engineering Research Div., Korea Institute of Construction Technology)
  • 투고 : 2012.09.11
  • 심사 : 2012.09.25
  • 발행 : 2012.09.28
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초록

울릉도는 강도가 약한 화산암과 강도는 높으나 수직절리가 잘 발달하는 조면암질암으로 구성되어 있으며, 이러한 지질학적 특성으로 인해 낙석이 빈번하게 발생하고 있어 일주도로의 이용에 큰 위험요소로 작용하고 있다. 본 연구에서는 낙석 재해위험도가 높은 울릉도 북동부의 약 3 km 구간을 대상으로 3종류의 낙석재해 위험도 평가법을 이용하여 낙석재해 위험도 평가를 수행하고 재해도를 작성하였다. 사용된 평가표는 일본 도로방재 총점검에서 적용된 낙석위험도 조사표, 일본 고속도로조사회의 낙석위험도 평가표, 그리고 미국연방도로국의 RHRS (Rockfall Hazard Rating System)이다. 도로사면의 지형 지질학적 조건을 고려하여 27개 구간을 설정하여 평가한 결과, 20개 사면(약 74%)에서 낙석재해 위험도가 높음과 보통으로 평가되었다. 이러한 조사결과를 바탕으로 낙석재해 위험도를 작성하였다.

The geology of Ulleung-Do is dominated by volcanic rocks with low strength and trachytic rocks with high strength but containing vertical joints that yield easily. Consequently, rockfalls along roadcuts are a major geological hazard, with the potential to affect the ring road of Ulleung-Do. In this study, we performed three types of rockfall hazard-risk assessment on the 3-km-long section of the ring road expected to have the highest possibility of rockfall. We used a rockfall ranking sheet in a roadside landslide hazard map, the Slope Stability Inspection Manual for National Highways (Japan), and a rockfall hazard rating system for inspection from the Japan Highway Public Corporation. We also employed the evaluation criteria of 'RHRS' developed by the Federal Highway Administration (FHA). An analysis of roadcuts at 27 sites with regard to geographic and geological conditions resulted in the identification of three classes of rockfall hazard (high, medium, and low). Of note, over 74% of slopes were assessed as high- and medium-class. Finally, a rockfall hazard map of the northeast region of Ulleung-Do was produced based on the evaluation results.

키워드

참고문헌

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피인용 문헌

  1. Analysis of Magnitude and Behavior of Rockfall for Volcanic Rocks in Ulleung-Do vol.24, pp.3, 2014, https://doi.org/10.9720/kseg.2014.3.373
  2. Artificial Accelerated Weathering of Volcanic Rocks from Ulleungdo Island vol.25, pp.4, 2015, https://doi.org/10.9720/kseg.2015.4.499
  3. Rockfall Risk Analysis Based on Precise Topography using UAV vol.20, pp.4, 2020, https://doi.org/10.9798/kosham.2020.20.4.63
  4. Analysis of Debris Flow Reduction Effect of Check Dam Types considering the Mountain Stream Shape: A Case Study of 2016 Debris Flow Hazard in Ulleung-do Island, South Korea vol.2021, pp.None, 2012, https://doi.org/10.1155/2021/8899368
  5. Processes driving understory community dynamics in Ulleungdo Island broadleaved forest, South Korea vol.36, pp.4, 2012, https://doi.org/10.1111/1440-1703.12231