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2026 Vol.27, Issue 11
Effects of Installation Location and Anchorage Conditions of Stabilizing Piles on Slope Stability and Pile Internal Forces

억지말뚝 설치위치와 안정지반 내 정착조건이 사면안정 및 말뚝 부재력에 미치는 영향

Hoki Ban1
,
Jaemo Kang2*
반 호기1
,
강 재모2*
1Professor, Dept. of Civil Engineering, Kangwon National University
2Research Fellow, Dept. of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology
*Corresponding Author
1 November 2026. pp. 5-14
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Abstract

Three-dimensional finite element strength reduction analyses of a 9-m-high dry idealized slope were performed to assess how stable-ground stiffness, pile location, embedment length, and anchorage conditions affect slope stability and pile internal forces. With 10-node modified tetrahedral elements (C3D10M), increasing the stiffness ratio from 5 to 20 raised the factor of safety by 1.19–2.40 % and the peak shear force by 24.79–35.49 %. For the frictional condition at a stiffness ratio of 20, the factor of safety was greatest at a position ratio of 0.55, whereas the peak bending moment and shear force occurred at 0.60. Replacing the bonded condition with the frictional condition changed the factor of safety by less than 0.08 % but increased the peak shear force by 10.38–16.08 %. With strength reduction factor (SRF) increments of 0.02 or less, embedment ratios of 5 and 7 shared a safety-factor bracket. A ratio of 5 was the shortest tested embedment achieving the safety-factor benefit for the modeled conditions, not a universal design minimum. The differing locations of maximum safety factor and maximum internal forces indicate that slope stability and pile structural demand should be considered together.

Keywords
Stabilizing pile
Slope stability
Strength reduction
Stable-ground stiffness
Pile internal forces

안정지반의 변형성과 말뚝 정착부의 구속조건은 사면 보강효과와 말뚝에 발생하는 부재력을 함께 좌우한다. 본 연구에서는 높이 9 m인 건조 조건의 이상화된 사면을 대상으로 3차원 유한요소 강도감소해석을 수행하여 안정지반 강성, 말뚝 위치, 안정지반 근입길이 및 말뚝-지반 상호작용 조건이 안전율과 말뚝 부재력에 미치는 영향을 평가하였다. 10절점 수정 사면체요소(C3D10M) 해석에서 강성비를 5에서 20으로 증가시키면 안전율은 위치에 따라 1.19~2.40 % 증가하였으나 최대 전단력은 24.79~35.49 % 증가하였다. 강성비 20의 마찰 조건에서 안전율은 위치비 0.55에서 최대였고, 최대 휨모멘트와 전단력은 위치비 0.60에서 발생하였다. 완전부착 조건을 마찰 조건으로 변경하면 안전율 변화는 0.08 % 이내였으나 최대 전단력은 10.38~16.08 % 증가하였다. 변위 급증 구간의 강도감소계수 증분을 0.02 이하로 세분한 결과, 안정지반 근입길이 5D와 7D 조건은 동일한 안전율 범위로 판정되었으며, 본 연구의 지반·말뚝 조건과 안전율 판정기준에서 5D는 검토한 근입길이 중 안전율 증가 효과가 확보된 최소값이었다. 안전율과 말뚝 부재력이 최대인 조건이 일치하지 않았으므로, 말뚝 위치와 정착조건을 평가할 때 안전율과 부재력을 함께 고려해야 한다.

키워드
억지말뚝
사면안정
강도감소법
안정지반 강성
말뚝 부재력
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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 :11
  • Pages :5-14
  • Received Date : 2026-09-15
  • Revised Date : 2026-09-16
  • Accepted Date : 2026-10-19
  • DOI :https://doi.org/10.14481/jkges.2026.27.11.5
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