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2026 Vol.42, Issue 4 Preview Page
Mini-CPT Analysis of Cone Tip Resistance in Cohesionless Soil under Centrifuge Tests

원심모형 소형콘관입시험을 이용한 사질토의 선단저항 특성 분석

Beom-Soo Kim1
,
Kyeng-Sun Kim2
,
Seung-Won Oh3
,
Sung-Ryul Kim4*
김 범수1
,
김 경선2
,
오 승원3
,
김 성렬4*
1Member, Graduate Student, Dept. of Civil, Urban and Environmental Engineering, Seoul National Univ.
2Member, Graduate Student, Dept. of Civil, Urban and Environmental Engineering, Seoul National Univ.
3Member, Graduate Student, Dept. of Civil, Urban and Environmental Engineering, Seoul National Univ.
4Member, Prof., Dept. of Civil, Urban and Environmental Engineering, Seoul National Univ.
1정회원, 서울대학교 건설환경도시공학부 석사과정
2정회원, 서울대학교 건설환경도시공학부 박사과정
3정회원, 서울대학교 건설환경도시공학부 박사과정
4정회원, 서울대학교 건설환경도시공학부 교수
*Corresponding Author
31 August 2026. pp. 91-102
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Abstract

Depth profiles of cone tip resistance reflect changes in ground conditions. In this study, miniature cone penetration tests (mini-CPTs) were conducted in a centrifuge at 70 g to evaluate cone tip resistance in sandy ground under dry, saturated, and post-scour backfill conditions. The ground models were prepared using standard silica sands with different particle sizes, and cone tip resistance profiles were compared across the test conditions. The results show that, within the range of mean particle sizes examined, particle size had a limited effect, whereas ground-state characteristics, particularly relative density and saturation, had a greater influence. In the upper zone of the post-scour backfill, cone tip resistance was comparable to that in dense ground. As penetration depth increased, the response transitioned and converged toward that of the underlying original ground. These results indicate that changes in relative density and saturation induced by scour and backfilling history affect cone tip resistance and transition behavior in sandy ground.

Keywords
Backfill condition
Centrifuge test
Cone tip resistance
Mini-CPT
Sandy soil

지반 상태 변화는 콘 선단저항의 깊이별 분포에 반영될 수 있으며, 특히 해상기초 주변 사질토 지반은 세굴 및 되메움 과정에서 국부적인 조밀도와 포화상태 변화가 발생할 수 있다. 본 연구에서는 70 g 원심모형 환경에서 소형콘관입시험을 수행하여, 건조 및 포화 조건과 세굴 후 되메움 조건을 포함한 사질토 지반의 깊이별 선단저항 변화를 분석하였다. 모형지반은 서로 다른 입경의 표준 규사를 이용하여 조성하였으며, 각 조건에서 획득한 깊이별 선단저항을 비교하였다. 시험 결과, 본 연구에서 적용한 평균입경 범위에서는 입경 차이에 따른 영향이 제한적이었으며, 상대밀도와 포화상태 등 지반 상태 변화의 영향이 상대적으로 뚜렷하게 나타났다. 특히 세굴 후 되메움 조건에서는 조밀한 건조 규사로 재충전된 상부 되메움 영역에서 조밀 지반 조건과 유사한 수준의 선단저항이 관찰되었다. 이후 관입 깊이가 증가함에 따라 선단저항은 점진적인 전이구간을 거쳐 하부 원지반의 응답으로 수렴하였다. 이는 사질토 지반 내에서 세굴 및 되메움 이력에 의해 형성된 국부적인 조밀도 및 포화상태 변화가 선단저항과 전이거동에 영향을 미친 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 : 42
  • No :4
  • Pages :91-102
  • Received Date : 2026-06-17
  • Revised Date : 2026-07-06
  • Accepted Date : 2026-07-07
  • DOI :https://doi.org/10.7843/kgs.2026.42.4.91
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