Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Analysis of Volumetric Deformation Influence Factor after Liquefaction of Sand using Cyclic Direct Simple Shear Tests

CDSS 실험을 이용한 모래의 액상화 후 체적변형 영향인자 분석

  • Herrera, Diego (Dept. of Civil & Environmental Engineering, University of Science & Technology) ;
  • Kim, Jongkwan (Dept. of Geotechnical Engineering Research, Korea Institute of Construction and Building Technology) ;
  • Kwak, Tae-Young (Dept. of Geotechnical Engineering Research, Korea Institute of Construction and Building Technology) ;
  • Han, Jin-Tae (Dept. of Geotechnical Engineering Research, Korea Institute of Construction and Building Technology)
  • 에레라 디에고 (과학기술연합대학원대학교 건설환경공학) ;
  • 김종관 (한국건설기술연구원 지반연구본부) ;
  • 곽태영 (한국건설기술연구원 지반연구본부) ;
  • 한진태 (한국건설기술연구원 지반연구본부)
  • Received : 2024.05.10
  • Accepted : 2024.05.27
  • Published : 2024.06.30
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Abstract

This study investigates liquefaction-induced settlement through strain-controlled tests using a cyclic direct simple shear device on clean sand specimens. By focusing on the accumulated shear strain, soil density, sample preparation method, and cyclic waveshape, this study attempts to enhance the understanding of soil behavior under seismic loading and its further deformation. Results from tests conducted on remolded samples reveal insights into excess pore water pressure development and post-liquefaction volumetric strain behavior, with denser samples exhibiting lower volumetric strains than looser samples. Similarly, the correlation between the frequency and amplitude variations of the wave and volumetric strain highlights the importance of wave characteristics in soil response, with shear strain amplitude changes, varying the volumetric strain response after reconsolidation. In addition, samples prepared under moist conditions exhibit less volumetric strain than dry-reconstituted samples. Overall, the findings of this study are expected to contribute to predictive models to evaluate liquefaction-induced settlement.

본 연구에서는 여러 영향 인자들이 사질토의 액상화로 인한 침하에 미치는 영향을 확인하기 위해 변형률 제어조건 하에서 반복단순직접전단시험을 수행하였다. 누적 전단 변형률, 상대밀도, 반복 하중의 형태, 시료 준비 방법 등의 다양한 인자들을 선정하였으며, 지진 하중이 발생하였을 때 인자들이 지반 침하에 미치는 영향을 분석하였다. 시험 결과, 누적 전단 변형률이 낮고 상대밀도가 높은 시료에서 더 작은 부피 변형이 발생하였다. 추가적으로 반복하중의 진폭은 부피 변형에 영향을 미쳤으나, 주파수는 시료의 부피 변형에 영향을 미치지 않는다는 사실을 확인할 수 있었다. 시료 준비 방법에 따라서도 액상화에 따른 침하가 다른 양상을 보인다는 사실을 확인하였으며, 이와 같은 결과들은 향후 액상화로 인한 침하 예측을 수행할 때 기초 연구로써 의미가 있을 것으로 기대된다.

Keywords

Acknowledgement

Research for this paper was carried out under the KICT Research Program (project no. 20240104-001, Database construction for ground liquefaction assessment based on AI technology) funded by the Ministry of Science and ICT.

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