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2026 Vol.42, Issue 3 Preview Page
Evaluation of the Embedment Depth and Pile Spacing of Strand-Connected Back-Supported Piles for Retaining Walls

흙막이벽체와 강연선으로 연결된 배면지지 파일의 근입장 및 간격에 대한 평가

Jong-Jin Joo1
,
Jun-Suk Moon2
,
Kang-Il Lee3*
주 종진1
,
문 준석2
,
이 강일3*
1Member, Ph.D. Student, Dept. of Smart City and Construction Convergence Engineering, Daejin Univ.
2Member, Ph.D. Student, Dept. of Smart City and Construction Convergence Engineering, Daejin Univ.
3Member, Prof., Dept. of Smart Civil and Environmental Engineering, Daejin Univ.
1정회원, 대진대학교 스마트시티건설융합공학과 박사과정
2정회원, 대진대학교 스마트시티건설융합공학과 박사과정
3정회원, 대진대학교 스마트건설환경공학과 교수
*Corresponding Author
30 June 2026. pp. 77-88
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Abstract

This study proposes a strand-connected back-supported pile system consisting of double-row H-piles with prestressed steel strands to overcome the structural limitations of conventional self-supported retaining wall systems and to determine the optimal embedment depth and pile spacing. To this end, model tests were conducted by varying the relative density of the sand and the embedment depths of the retaining wall and back-supported piles. In addition, numerical analyses were performed under the same conditions while varying the spacing of the back-supported piles. The results indicated that, to ensure retaining wall stability, the embedment depth of the wall should be at least 3.0m. In particular, under loose sand conditions, the combined embedment depths of the retaining wall and back-supported piles should exceed 9.0m to provide sufficient stability. Furthermore, a pile spacing of 10.8m or less was found to be the most effective for the back-supported piles under all relative density conditions in terms of stability efficiency.

Keywords
Back-supported pile
Embedment depth
Pile spacing
Retaining wall

본 연구는 기존 자립식 흙막이 공법의 구조적 한계를 보완하기 위한 연구로서 H-Pile을 2열로 배치하고 강연선에 프리스트레스를 도입한 것으로 배면지지 파일의 적정 근입장 및 수평간격을 산정하는데 목적이 있다. 이를 위해 본 연구에서는 모래의 상대밀도와 흙막이 벽체의 근입장, 배면지지 파일의 근입장을 달리하여 모형시험을 수행하였으며 동일한 조건으로 배면지지 파일의 수평간격을 달리하여 수치해석을 수행하였다. 연구 결과 흙막이 벽체의 안정성을 확보하기 위해서는 흙막이 벽체 근입장을 3.0m 이상 확보가 필요한 것으로 분석되었다. 특히 느슨한 모래지반에서는 흙막이 벽체와 배면지지 파일 근입장의 합을 9.0m 이상 확보하여야 안정성이 확보되는 것으로 분석되었다. 또한 배면지지 파일의 수평간격은 모든 상대밀도 조건에서 10.8m 이하를 적용하는 것이 안정성 측면에서 가장 효과적인 것으로 평가되었다.

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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 :3
  • Pages :77-88
  • Received Date : 2026-04-07
  • Revised Date : 2026-05-12
  • Accepted Date : 2026-05-13
  • DOI :https://doi.org/10.7843/kgs.2026.42.3.77
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