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2026 Vol.27, Issue 8 Preview Page
Stability Analysis of Horizontal Support-Replacing Anchors at Different Excavation Stages

굴착단계별 수평 지보재 대체 앵커의 안정성 해석

Seungil Choi1
,
Dabin Kwon2
,
Gyeongseok Yu3
,
Serin Kwon4
,
Changjun Kim5
,
Seungjoo Lee6
,
Chanyoung Park7
,
Yongseong Kim8*
최 승일1
,
권 다빈2
,
유 경석3
,
권 세린4
,
김 창준5
,
이 승주6
,
박 찬영7
,
김 용성8*
1Ph.D, Dept. of Regional Infrastructure Engineering, Kangwon National University
2M.S. Student, Dept. of Regional Infrastructure Engineering, Kangwon National University
3Professor, Dept. of Civil and Architectural Engineering, Seokyeong University
4Yangyang County Office
5Integrated M.S.-Ph.D Program, Dept. of Regional Infrastructure Engineering, Kangwon National University
6Researcher, Korean Peninsula Infrastructure Special Committee, Korea Institute of Civil Engineering and Building Technology
7Ph.D, Dept. of Regional Infrastructure Engineering, Kangwon National University
8Professor, Dept. of Regional Infrastructure Engineering, Kangwon National University
*Corresponding Author
1 August 2026. pp. 13-26
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Abstract

As underground space development in urban areas increases, excavation support methods that can ensure stability within confined urban sites are becoming increasingly important. Horizontal struts occupy the excavation space, while ground anchors may extend beyond the site boundary, limiting their applicability in urban areas. In this study, staged excavation stability analysis was performed for a horizontal support-replacing anchor system. Numerical analyses were conducted under two-dimensional plane strain conditions using PLAXIS 2D, and wall horizontal displacement, ground surface settlement, and factor of safety were evaluated through staged construction analysis and the shear strength reduction method. The results showed that wall horizontal displacement increased as the anchor inclination angle increased, especially under high-angle conditions of 80° or greater. Increases in bonded length and free length reduced displacement to some extent, but their influence was limited beyond a certain length. In contrast, increasing the jacking force reduced wall horizontal displacement under the same inclination angle. In addition, comparison with field measurements indicated that the maximum horizontal displacement obtained from the analysis was larger than the measured value, indicating that the numerical analysis provided conservative estimates of wall displacement. Therefore, in the design of horizontal support-replacing anchors, the anchor inclination angle and jacking force should be considered together while satisfying the minimum bonded length and free length requirements.

Keywords
Earth retaining method
Horizontal support-replacing anchor
Stability analysis

도심지 지하공간 개발이 증가함에 따라 제한된 부지 내에서 안정적으로 굴착을 수행할 수 있는 흙막이 지보 공법의 필요성이 커지고 있다. 수평 지보재는 굴착 내부 공간을 점유하고, 어스앵커는 정착장이 부지 외부로 확장될 수 있어 도심지 조건에서 적용상 한계를 가진다. 본 연구에서는 이러한 문제를 보완하기 위해 수평 지보재를 대체할 수 있는 앵커 시스템을 대상으로 굴착단계별 안정성 해석을 수행하였다. 수치해석은 PLAXIS 2D를 이용한 2차원 평면변형률 조건에서 수행하였으며, 시공단계별 해석과 전단강도 감소기법을 적용하여 벽체 수평변위, 배면 지표침하량 및 안전율을 검토하였다. 해석 결과, 앵커 설치각이 증가할수록 벽체 수평변위가 증가하였으며, 특히 80° 이상의 고각 조건에서 변위 증가가 뚜렷하였다. 정착장 및 자유장 길이 증가는 일부 변위 저감 효과를 보였으나, 일정 길이 이상에서는 그 영향이 제한적이었다. 반면 긴장력(jacking force)이 증가할수록 동일한 경사각 조건에서 벽체 수평변위가 감소하였다. 또한 현장계측 결과와 비교한 결과, 해석 최대 수평변위가 계측값보다 크게 산정되어 수치해석이 벽체 변위를 보수적으로 평가하는 경향을 보였다. 따라서 수평 지보재 대체 앵커 설계 시에는 최소 정착장 및 자유장 조건을 만족하는 범위에서 앵커 설치각과 긴장력을 함께 고려할 필요가 있다.

키워드
흙막이 공법
수평 지보재 대체 앵커
안정성 해석
References
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 27
  • No :8
  • Pages :13-26
  • Received Date : 2026-06-02
  • Revised Date : 2026-06-16
  • Accepted Date : 2026-07-28
  • DOI :https://doi.org/10.14481/jkges.2026.27.8.13
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