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<p>To investigate the mechanical response mechanisms of deep-sea sediments in the South China Sea under coupled field effects, this study systematically analyzed the influence of moisture content (15%-35%), temperature (4℃-60℃), and confining pressure (100–300&#xa0;kPa) on their undrained shear strength through triaxial shear tests. A thermohydraulic-coupled model was developed. Results indicate that increased moisture content significantly reduces shear strength: at low confining pressures, strength decreases by 50% across 15%-35% moisture content ranges, while high confining pressures reduce the decrease to 30% by enhancing particle confinement. Temperature elevation accelerates cement softening and particle thermal motion, causing cohesion to drop from 17.6&#xa0;kPa to 10.9&#xa0;kPa and internal friction angle from 23.8° to 16.7°. Although confining pressure enhances strength, it cannot reverse cement failure caused by high temperatures. The improved thermohydraulic-coupled model, incorporating moisture content sensitivity coefficient (m) and temperature sensitivity coefficient (n), achieves precise stress-strain relationship predictions under coupled field effects (correlation coefficient R²&gt; 0.97). These findings provide quantitative theoretical support for assessing engineering stability and risk management in resource development of deep-sea areas in the South China Sea.</p>

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Study on variation characteristics of shear strength of deep-sea sediments in the South China sea under thermo-hydraulic coupling

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月10日

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  • Yan Feng,
  • Qiunan Chen,
  • Lihai Wu,
  • Jinhu Tang,
  • Guangping Liu,
  • Zengliang Wang,
  • Wei Hu,
  • Bingchu Chen,
  • Shunkai Liu

摘要

To investigate the mechanical response mechanisms of deep-sea sediments in the South China Sea under coupled field effects, this study systematically analyzed the influence of moisture content (15%-35%), temperature (4℃-60℃), and confining pressure (100–300 kPa) on their undrained shear strength through triaxial shear tests. A thermohydraulic-coupled model was developed. Results indicate that increased moisture content significantly reduces shear strength: at low confining pressures, strength decreases by 50% across 15%-35% moisture content ranges, while high confining pressures reduce the decrease to 30% by enhancing particle confinement. Temperature elevation accelerates cement softening and particle thermal motion, causing cohesion to drop from 17.6 kPa to 10.9 kPa and internal friction angle from 23.8° to 16.7°. Although confining pressure enhances strength, it cannot reverse cement failure caused by high temperatures. The improved thermohydraulic-coupled model, incorporating moisture content sensitivity coefficient (m) and temperature sensitivity coefficient (n), achieves precise stress-strain relationship predictions under coupled field effects (correlation coefficient R²> 0.97). These findings provide quantitative theoretical support for assessing engineering stability and risk management in resource development of deep-sea areas in the South China Sea.