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<p>Exactly understanding the dilatancy of marine coral sand containing fines is critical for ensuring the safety of ocean infrastructures. This paper presents key findings coupled with an exhaustive discussion and elaboration through experimentally investigating dilatancy of marine coral sand. Test results indicate that both the modified Cam-clay model and Rowe’s dilatancy equation have limitations in accurately describing the dilatancy behavior of clean coral sand and its mixtures. The fines content and its corresponding threshold can determine the critical void ratio, thereby influencing dilatant or contractive behavior. Relationship between dilatancy ratio and equivalent void ratio (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(e^{*}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mi>e</mi> <mrow /> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>) suggests that using the variation in <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(e^{*}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mi>e</mi> <mrow /> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation> at phase-transition state to describe dilatancy is practical. Besides, a logarithmic correlation is observed between dilatancy ratio and stress ratio at peak state. Nevertheless, dilatancy ratio shows a negative linear relation with stress ratio at critical state. For the above-mentioned descriptions, a semi-empirical dilatancy equation accounting for particle breakage in marine coral sand was proposed and found to be reasonable after verification with previous test results.</p>

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Dilatancy behavior of marine coral sand–fines mixture in the South China Sea: critical thresholds and particle breakage effects

  • 期刊论文

  • 发表日期：

    2026年2月20日

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  • Xue Li,
  • Xiaoyue Li,
  • Jiyun Nan,
  • Taishan Lu

摘要

Exactly understanding the dilatancy of marine coral sand containing fines is critical for ensuring the safety of ocean infrastructures. This paper presents key findings coupled with an exhaustive discussion and elaboration through experimentally investigating dilatancy of marine coral sand. Test results indicate that both the modified Cam-clay model and Rowe’s dilatancy equation have limitations in accurately describing the dilatancy behavior of clean coral sand and its mixtures. The fines content and its corresponding threshold can determine the critical void ratio, thereby influencing dilatant or contractive behavior. Relationship between dilatancy ratio and equivalent void ratio ( \(e^{*}\) e ∗ ) suggests that using the variation in \(e^{*}\) e ∗ at phase-transition state to describe dilatancy is practical. Besides, a logarithmic correlation is observed between dilatancy ratio and stress ratio at peak state. Nevertheless, dilatancy ratio shows a negative linear relation with stress ratio at critical state. For the above-mentioned descriptions, a semi-empirical dilatancy equation accounting for particle breakage in marine coral sand was proposed and found to be reasonable after verification with previous test results.