Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of the Cylindrical Baffle Configuration Behind Rigid Barrier on Impact Load of Debris Flow

중력식 사방댐 후면에 설치된 원통형 대책구조물의 배치조건이 토석류의 충격하중에 미치는 영향

  • Kim, Beom-Jun (Institute of Disaster Prevention, Gangneung Wonju National Univ) ;
  • Yune, Chan-Young (Dept. of Civil Engrg., Gangneung Wonju National Univ.)
  • 김범준 (강릉원주대학교 방재연구소) ;
  • 윤찬영 (강릉원주대학교 토목공학과)
  • Received : 2022.07.04
  • Accepted : 2022.10.07
  • Published : 2022.11.30
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Abstract

This study investigates the effect of cylindrical baffle arrays behind a rigid barrier on debris flow behavior and dynamic impact load. Small-scale tests were performed with various transverse blockage ratios and row numbers of baffles. High-speed cameras were installed at the flume's top and side, and load cells were installed in front of the rigid barrier. Moreover, glass beads simulated large boulders with debris flow in the flume. Test results revealed that the impact load of debris flow on the rigid barrier was significantly reduced using the cylindrical baffles behind the rigid barrier. In addition, the increased transverse blockage ratio of baffle arrays led to a greater impact load of debris flow because of flow suppression due to the baffle arrays.

본 연구에서는 중력식 사방댐 후면에 설치된 원통형 강성기둥 구조물의 배치변화가 토석류의 흐름거동 및 충격하중 변화에 미치는 영향을 확인하기 위해, 대책구조물들을 소형수로에 모사한 다음 원통형 구조물의 종방향 배열 수와유로 차단비율을 변화시켜가면서 실내모형실험을 수행하였다. 실험과정에서 대책구조물의 주변 흐름거동을 촬영하고, 중력식 사방댐의 작용하는 토석류의 충격하중을 측정하기 위해, 수로 측면과 상부에는 고속카메라를 설치하였고, 사방댐의 전면에는 로드셀을 설치하였다. 게다가, 글라스 비즈를 이용하여 토석류에 의해 동반되는 큰 직경의 거석들을 수로에 모사하였다. 실험결과, 중력식 사방댐 후면에 원통형 강성기둥 구조물의 설치는 토석류의 충격하중을 크게 감소시키는 것으로 나타났다. 또한, 대책구조물의 유로 차단비율을 증가시키면 거석을 동반한 토석류의 흐름억제를 증가시켜 충격하중을 더욱 감소시키는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 2021년도 정부(교육부)의 재원으로 한국연구재단의 기초연구사업(2021R1A6A1A03044326, 2021R1A6A3A01086753)의 지원을 받았습니다. 이에 감사드립니다.

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