Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Effect of Non-Plastic Fines Content on the Pore Pressure Generation of Sand-Silt Mixture Under Strain-Controlled CDSS Test

변형률 제어 반복직접단순전단시험에서 세립분이 모래-실트 혼합토의 간극수압에 미치는 영향

  • Tran, Dong-Kiem-Lam (Department of Civil Engineering, Kyungpook National University) ;
  • Park, Sung-Sik (Department of Civil Engineering, Kyungpook National University) ;
  • Nguyen, Tan-No (Department of Civil Engineering, Kyungpook National University) ;
  • Park, Jae-Hyun (Department of Civil Engineering, Kyungpook National University) ;
  • Sung, Hee-Young (Department of Civil Engineering, Kyungpook National University) ;
  • Son, Jun-Hyeok (Department of Civil Engineering, Kyungpook National University) ;
  • Hwang, Keum-Bee (Intelligent Construction Automation Center)
  • ;
  • 박성식 (경북대학교 공과대학 토목공학과) ;
  • ;
  • 박재현 (경북대학교 공과대학 토목공학과) ;
  • 성희영 (경북대학교 공과대학 토목공학과) ;
  • 손준혁 (경북대학교 공과대학 토목공학과) ;
  • 황금비 (지능형건설자동화 연구센터)
  • Received : 2023.10.31
  • Accepted : 2023.11.30
  • Published : 2024.01.01
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Abstract

Understanding the behavior of soil under cyclic loading conditions is essential for assessing its response to seismic events and potential liquefaction. This study investigates the effect of non-plastic fines content (FC) on excess pore pressure generation in medium-density sand-silt mixtures subjected to strain-controlled cyclic direct simple shear (CDSS) tests. The investigation is conducted by analyzing excess pore pressure (EPP) ratios and the number of cycles to liquefaction (Ncyc-liq) under varying shear strain levels and FC values. The study uses Jumunjin sand and silica silt with FC values ranging from 0% to 40% and shear strain levels of 0.1%, 0.2%, 0.5%, and 1.0%. The findings indicate that the EPP ratio increases rapidly during loading cycles, with higher shear strain levels generating more EPP and requiring fewer cycles to reach liquefaction. At 1.0% and 0.5% shear strain levels, FC has a limited effect on Ncyc-liq. However, at a lower shear strain level of 0.2%, increasing FC from 0 to 10% reduces Ncyc-liq from 42 to 27, and as FC increases further, Ncyc-liq also increases. In summary, this study provides valuable insights into the behavior of soil under cyclic loading conditions. It highlights the significance of shear strain levels and FC values in excess pore pressure generation and liquefaction susceptibility.

Keywords

Acknowledgement

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No.NRF-2021R1I1A3059731).

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