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2026 Vol.42, Issue 2 Preview Page
Failure Envelope for Estimating the Pullout Capacity of Suction Anchor in Silty Sand Considering Cohesion and Misorientation

실트질모래의 점착력과 회전오차를 고려한 석션앵커 인발지지력 산정 파괴포락선

Young-Ho Yoon1
,
Joong-Ho Lee2*
,
Won-Hyo Lee3
,
Sung-Chul Lee4
,
Tae-Hyung Kim5
윤 영호1
,
이 중호2*
,
이 원효3
,
이 성철4
,
김 태형5
1Member, Ph.D. Candidate, Dept. of Civil Engineering, National Korea Maritime and Ocean Univ.
2Member, Ph.D. Candidate, Dept. of Civil Engineering, National Korea Maritime and Ocean Univ.
3Member, Ph.D., Dept. of Civil Engineering, National Korea Maritime and Ocean Univ.
4Member, Ph.D., Dept. of Civil Engineering, National Korea Maritime and Ocean Univ.
5Member, Prof., Dept. of Civil Engineering, National Korea Maritime and Ocean Univ.
1정회원, 국립한국해양대학교 토목공학과 박사과정
2정회원, 국립한국해양대학교 토목공학과 박사과정
3정회원, 국립한국해양대학교 토목공학과 박사
4정회원, 국립한국해양대학교 토목공학과 박사
5정회원, 국립한국해양대학교 토목공학과 교수
*Corresponding Author
30 April 2026. pp. 69-76
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Abstract

In floating offshore wind power, accurately estimating the pullout capacity of suction anchors is critical. This research proposes a failure envelope for the pullout capacity of suction anchors installed in cohesive silty sand, considering anchor misorientation. The failure envelope was developed using both geometric and numerical analytical methods. The pullout capacity of suction anchors in silty sand can be estimated using the failure envelope, which incorporates the skin friction of the anchor while factoring in cohesion. For anchor misorientation angles (β) ranging from 0° to 20°, the pullout capacities predicted by the geometric method align closely with those obtained from the modified failure envelope. However, in the β range of 30° to 45°, the geometric method significantly overestimates the pullout capacity compared to the failure envelope. In addition, the pullout capacity predicted by the modified failure envelope is lower than that obtained from numerical analysis, suggesting that the proposed method offers a conservative assessment. The results of this study facilitate a simplified evaluation of the pullout capacity of suction anchors in cohesive soils when considering anchor misorientation.

Keywords
Cohesive silty sand
Failure envelope
Misorientation
Pullout capacity
Suction anchor

부유식 해상풍력 석션앵커 연구에서 인발지지력 산정은 매우 중요하다. 현재까지 연구 결과를 바탕으로 본 연구에서는 점착력을 가진 실트질 모래지반에 대해 앵커의 회전오차까지 고려한 인발지지력에 대한 파괴포락선을 제안하였다. 기하학적 및 수치해석 두 방법을 이용하였다. 파괴포락선을 이용한 실트질모래의 인발지지력은 점착력을 고려하여 석션앵커의 주면마찰력을 추가함으로써 산정할 수 있다. 앵커의 회전오차 β=0~20° 범위에서는 수정 파괴포락선에 의한 인발지지력에 대해 기하학적 방법이 유사한 양상을 띄고, β=30~45° 범위에서는 파괴포락선에 비하여 기하학적 방법이 크게 산정되었다. 또한 수정 파괴포락선의 인발지지력은 수치해석 방법에 비하여 인발지지력이 작게 산정되어 보수적인 평가로 판단된다. 본 연구결과를 활용하면 점착력이 있는 지반의 앵커 회전오차 발생에 대해 간편하게 석션앵커의 인발지지력를 평가할 수 있다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 42
  • No :2
  • Pages :69-76
  • Received Date : 2026-02-20
  • Revised Date : 2026-03-30
  • Accepted Date : 2026-03-31
  • DOI :https://doi.org/10.7843/kgs.2026.42.2.69
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