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<p>This study evaluated the static and cyclic liquefaction of mixtures of sands and fines under different density states, with particular emphasis on the relationship between static instability and cyclic response. Undrained static triaxial tests were performed to establish stress-strain response, effective stress paths, and instability conditions for loose and medium-dense mixtures. Cyclic triaxial tests were conducted to examine the strain accumulation and stress paths evolution leading to liquefaction. The analysis of the results showed that the stress states during cyclic loading remained bounded by an envelope of static response, which limited the cyclic deformations. A key contribution of this study is the demonstration that, for sand-fines mixtures, instability friction angles obtained from static loading accurately predict the onset of cyclic instability across different density states and fines content. This finding establishes a direct and quantitative link between static and cyclic liquefaction mechanisms specifically for sand-fines mixtures, indicating that static loading characteristics govern cyclic soil response and can be used to assess liquefaction susceptibility under cyclic loading.</p>

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Stress Paths of Clean Sand and Sand-fines Mixtures Under Static and Cyclic Testing

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Bassel Seif El Dine,
  • Layal Jradi,
  • Jean-Claude Dupla,
  • Jean Canou,
  • Bachar Tarraf

摘要

This study evaluated the static and cyclic liquefaction of mixtures of sands and fines under different density states, with particular emphasis on the relationship between static instability and cyclic response. Undrained static triaxial tests were performed to establish stress-strain response, effective stress paths, and instability conditions for loose and medium-dense mixtures. Cyclic triaxial tests were conducted to examine the strain accumulation and stress paths evolution leading to liquefaction. The analysis of the results showed that the stress states during cyclic loading remained bounded by an envelope of static response, which limited the cyclic deformations. A key contribution of this study is the demonstration that, for sand-fines mixtures, instability friction angles obtained from static loading accurately predict the onset of cyclic instability across different density states and fines content. This finding establishes a direct and quantitative link between static and cyclic liquefaction mechanisms specifically for sand-fines mixtures, indicating that static loading characteristics govern cyclic soil response and can be used to assess liquefaction susceptibility under cyclic loading.