Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Physical Behavior and the Applicability of Rock Anchorage System of a Suspension Bridge in Domestic Island

현수교 지중정착식 앵커리지의 거동특성과 국내 도서지역에서의 적용성에 대한 연구

  • Received : 2021.02.10
  • Accepted : 2021.02.17
  • Published : 2021.02.28
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Abstract

The rock anchorage of a suspension bridge is an outstanding anchorage type from environmental and economical perspective, although it should be applied when the bearing foundation is fresh enough to resist large cable loads. In practice, geotechnical engineers have encountered difficulties in designing the anchorage structure due to the fact that the physical behaviors of rocks against cable loads have not yet been fully proved and its design method was not established yet. In this study, model tests and numerical studies were performed to evaluate the behavior of the rock anchorage system planned under hard rock layers in domestic islands, and results suggest that the shape of asymmetric rock wedges can resist the tension loads with self weight and shear resistance. Additionally, real scale trial tests were carried out to verify the accuracy of an inclined drilling penetrating hard rock layers to install tendon to the bearing plate.

현수교의 지중정착식 앵커리지는 기초 암반이 신선할 경우에 적용될 수 있는 형식으로, 앵커리지 형식 중 환경성과 경제성 측면에서 뚜렷한 장점이 있다. 그러나 케이블 하중 재하시 암반의 거동특성이 아직 명확하게 규명되지 않았고 설계기법이 정립되어 있지 않아, 실무자들이 구조물 계획을 수립하는데 많은 어려움을 겪고 있다. 본 연구에서는 국내 도서지역의 경암 지반에 계획된 지중정착식 앵커리지를 대상으로 모형실험과 수치해석을 수행하고 지지암반의 거동 특성을 평가하였으며, 자중과 전단력으로 케이블 하중에 저항하는 비대칭 형태의 암반 쐐기 블록을 제안하였다. 또한 경암 지반에서 강연선 홀 설치를 위한 실규모 시험천공을 실시하고, 경사 천공의 정밀도를 확인하여 지중정착식 앵커리지의 적용 가능성을 평가하였다.

Keywords

References

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