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2022 Vol.38, Issue 11 Preview Page
Evaluation of Liquefaction Model using Dynamic Centrifuge Test

포화된 경사 사질토 지반의 액상화 수치모델 거동평가

Jin-Sun Lee1*
,
Sang-Un Lee2
이 진선1*
,
이 상운2
1Member, Prof., Dept. of Civil and Environmental Engrg., Wonkwang Univ.
2Graduate Student, Dept. of Civil and Environmental Engrg., Wonkwang Univ.
1정회원, 원광대학교 건설환경공학과 교수
2비회원, 원광대학교 석사과정
*Corresponding Author
30 November 2022. pp. 31-42
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Abstract

This study verified numerical analysis of the liquefaction phenomenon using LEAP-2017 international round-robin centrifuge test results. Dynamic centrifuge test is performed by applying a 1 Hz tapered sine wave to the model soil deposit, which was formed under a water table in a surface slope of 5° using Ottawa F-65 sand. A numerical model was made on a prototype scale and analyzed using the finite difference method in 2D and 3D conditions. The analyses were verified for acceleration and pore-water pressure histories with depth and residual displacement. Verification results revealed that all numerical liquefaction models agree reasonably with the test result for acceleration histories but not for pre-water pressure histories. Numerical analyses showed much smaller residual displacement than the centrifuge test. Thus, it is necessary to compare the results of numerical analysis with the centrifuge test performed by other institutes in the future.

Keywords
Dynamic centrifuge test
LEAP-2017
Liquefaction
Numerical analysis
Response history analysis

본 논문에서는 원심모형시험을 이용한 국제공동연구인 LEAP-2017의 결과를 이용하여 액상화 수치모델의 거동에 대한 검증을 실시하였다. 동적원심모형시험은 Ottawa F-65모래로 수면 아래 조성된 경사각 5°의 지반에 1Hz 테이퍼형 사인파를 가진하여 시행되었다. 원심모형시험의 원형스케일로 모델링 된 수치해석 모델은 유한차분법을 이용한 2차원 및 3차원 해석을 시행하였다. 수치해석의 검증은 깊이별 가속도와 간극수압 시간이력, 잔류변위에 대해 이루어 졌다. 검증결과, 모든 모델에서 시험과 유사한 가속도 시간이력을 나타내었으나, 일부모델이 나타내는 간극수압의 변화는 시험결과와 차이를 나타내었다. 수치해석결과로 나타난 액상화 후 잔류변위는 원심모형시험 대비 매우 작은 크기로 확인되어, 이에 대해서는 추후 LEAP-2017에 참여한 다른 기관의 시험결과와 비교분석이 필요한 것으로 확인되었다.

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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 : 38
  • No :11
  • Pages :31-42
  • Received Date : 2022-08-23
  • Revised Date : 2022-09-27
  • Accepted Date : 2022-10-12
  • DOI :https://doi.org/10.7843/kgs.2022.38.11.31
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