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2026 Vol.27, Issue 11 Preview Page
Effect of Relative Density on the Residual Shear Behavior Characteristics of Sandy Soil during Seepage

침투 시 사질토의 잔류전단거동 특성에 상대밀도가 미치는 영향

Byeongkeun Kong1
,
Kwangkuk Ahn2*
공 병근1
,
안 광국2*
1Senior Manager, Railway Construction Department, Korea National Railway
2Professor, School of Civil Engineering, Chungbuk National University
*Corresponding Author
1 November 2026. pp. 41-47
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Abstract

Recently, the occurrence of seepage within the ground has been increasing due to the higher frequency of localized heavy rainfall, prolonged rainfall, fluctuations in groundwater levels, impaired drainage systems, and leakage around structures. Seepage can degrade the stability of slopes and earth structures by altering the moisture condition and pore water pressure distribution of the ground, and by affecting the interparticle contact structure and effective stress state. Understanding the variation characteristics of shear strength due to seepage in sandy soils is crucial for evaluating slope stability and the long-term behavior of geotechnical structures. Therefore, in this study, ring shear tests were conducted to investigate the effect of relative density on the residual shear behavior of sandy soils subjected to seepage after reaching a residual state. As a result, relative density was confirmed to be a major factor that significantly affected not only the peak and residual shear resistance before seepage, but also the peak and residual shear resistance after seepage.

Keywords
Sandy soil
Relative density
Residual shear behavior
Seepage

최근 집중호우의 빈도 증가, 장기 강우의 지속, 지하수위 변동, 배수시설의 기능 저하 및 구조물 주변의 누수 등으로 인해 지반 내 침투가 발생하는 사례가 증가하고 있다. 투수는 지반의 함수상태와 간극수압 분포를 변화시키고 토립자 간 접촉구조 및 유효응력 상태에 영향을 미침으로써 비탈면 및 토공구조물의 안정성을 저하시킬 수 있다. 사질토 지반에서 침투에 따른 전단강도 변화 특성을 파악하는 것은 비탈면 안정성 및 지반구조물의 장기거동을 평가하는데 중요하다. 이에 본 연구에서는 잔류상태에 도달한 사질토에 대하여 침투 시 사질토의 잔류전단거동에 상대밀도가 미치는 영향을 확인하기 위해 링전단시험을 수행하였다. 그 결과 상대밀도는 침투 전 최대 및 잔류전단저항뿐만 아니라 침투 후 최대 및 잔류전단저항에도 영향을 미치는 주요 인자로 확인되었다.

키워드
사질토
상대밀도
잔류전단거동
침투
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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 :41-47
  • Received Date : 2026-10-01
  • Revised Date : 2026-10-06
  • Accepted Date : 2026-10-23
  • DOI :https://doi.org/10.14481/jkges.2026.27.11.41
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