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2025 Vol.41, Issue 5 Preview Page
Analysis of Long-term Compression Settlement Behavior of Embankment Materials with Various Fine Content

세립분 함량에 따른 성토재료의 장기압축침하 거동 분석

Seung-Jun Lee1
,
Tea-Wan Bang2
,
Jong-Nam Do3
,
Wan-Jei Cho4*
이 승준1
,
방 태완2
,
도 종남3
,
조 완제4*
1Member, Graduate Student, Dept. of Civil & Environmental Engrg, Dankook Univ.
2Member, Graduate Student, Dept. of Civil & Environmental Engrg, Dankook Univ.
3Member, Principal Research, Korea Expressway Coporation Research Institite
4Member, Prof., Dept. of Civil & Environmental Engrg, Dankook Univ.
1정회원, 단국대학교 토목환경공학과 석사과정
2정회원, 단국대학교 토목환경공학과 통합과정
3정회원, 한국도로공사 도로교통연구원 지하안전평가센터 수석연구원
4정회원, 단국대학교 토목환경공학과 교수
*Corresponding Author
31 October 2025. pp. 57-67
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Abstract

Embankments and backfill ground above underground structures play a crucial role in transferring and supporting external loads. The interaction between the ground and structure is essential for maintaining stability and performance. However, time-dependent creep settlement can severely affect structural integrity by causing deformation and cracking. As reports of these types of issues continue to increase, engineering interest in the long-term behavior of ground materials has increased markedly. This study identified applied load and fine content as major influencing factors based on an analysis of domestic cases and creep mechanisms. Large-scale compression tests were then performed on actual embankment materials. In addition, the applicability of major long-term settlement prediction methods was assessed using the test results. Analysis of the test data revealed that increased applied load and fine content resulted in greater creep deformation. Notably, under high-load conditions with 25% fine content, creep accounted for approximately 40% of the total deformation. These conditions led to significant discrepancies among settlement prediction methods for sandy soils, with potential long-term deformation exceeding the empirical prediction range of 1.1%. This suggests that even sandy materials meeting current standards may experience settlement beyond allowable limits, particularly in high-embankment scenarios. Consequently, a review of the adequacy of current design criteria and the implementation of stricter management standards are necessary to ensure long-term settlement stability.

Keywords
Creep settlement
Fine content
Embankment Materials
Large-scale compression test
Underground structure

지중구조물 상부 성토 및 뒤채움 지반은 외부 하중을 전달하고 지지하는 역할을 수행하며, 구조물과 상호작용하여 안정성 및 성능 확보에 기여한다. 그러나 시간이 경과함에 따라 발생하는 지반의 Creep 침하는 구조물의 변형, 균열 발생 등 안정성에 심각한 영향을 미칠 수 있으며, 이러한 문제 사례가 지속적으로 보고됨에 따라 지반 장기거동 특성 및 그 영향에 대한 공학적 관심이 높아지고 있다. 이에 본 연구는 국내 사례 및 Creep 메커니즘 분석을 통해 하중과 세립분 함량을 주요 영향 인자로 파악하고, 실제 성토재료를 대상으로 대형 압축실험을 수행하였다. 또한, 실험 결과를 토대로 주요 장기 침하 예측법의 적용성을 검토하였다. 실험 결과, 재하 하중 및 시료 내 세립분 함량 증가는 Creep 변형을 증가시켰으며, 특히 고하중 및 세립분 25% 조건의 경우 전체 변형의 약 40% 정도가 Creep에 의해 발생하는 것으로 확인되었다. 이러한 조건에서는 사질토의 침하 예측 방법 간 편차가 크게 발생하였고, 일부는 경험적 예측 범위(1.1%)를 초과하는 장기 변형 가능성도 확인되었다. 이는 현행 기준을 충족하는 사질토 재료의 경우에도 고성토 조건 등에서 허용 한계 이상의 침하 발생 가능성을 나타내며, 장기 침하에 대한 안정성 확보를 위해 설계 기준의 적정성 검토 및 보다 엄격한 관리 기준이 필요할 것으로 판단된다.

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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 : 41
  • No :5
  • Pages :57-67
  • Received Date : 2025-08-05
  • Revised Date : 2025-09-04
  • Accepted Date : 2025-09-10
  • DOI :https://doi.org/10.7843/kgs.2025.41.5.57
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