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<p>Fluid-driven particle migration in gap-graded soils poses risks to the stability and performance of geotechnical systems. This study investigates the influence of fines content and particle size ratio on the mechanical response of gap-graded soils subjected to controlled particle removal. A series of 90 drained and undrained triaxial tests are conducted using specimens prepared with varying gradations and subjected to salt dissolution to simulate particle removal. The results show that higher fines content and lower particle size ratios increase volumetric deformation and reduce strength and dilatancy. Particle removal in gap-graded soils yields structure-dependent strength changes.&#xa0;Neural network sensitivity highlights fines content and void ratio as dominant controls, with particle size ratio effects modulated by drainage conditions. These findings offer critical insights into the coupled effects of gradation and particle removal on the performance and stability of geotechnical systems.</p>

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Mechanical Behaviour of Gap-graded Soils Subjected to Particle Removal: Influence of Fines Content and Particle Size Ratio

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Sheng Jiang,
  • Shilin Jiao,
  • Yu Wan,
  • Xu Li

摘要

Fluid-driven particle migration in gap-graded soils poses risks to the stability and performance of geotechnical systems. This study investigates the influence of fines content and particle size ratio on the mechanical response of gap-graded soils subjected to controlled particle removal. A series of 90 drained and undrained triaxial tests are conducted using specimens prepared with varying gradations and subjected to salt dissolution to simulate particle removal. The results show that higher fines content and lower particle size ratios increase volumetric deformation and reduce strength and dilatancy. Particle removal in gap-graded soils yields structure-dependent strength changes. Neural network sensitivity highlights fines content and void ratio as dominant controls, with particle size ratio effects modulated by drainage conditions. These findings offer critical insights into the coupled effects of gradation and particle removal on the performance and stability of geotechnical systems.