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<p>This study investigates the mechanical performance of Chlef sand reinforced with geocells, using a series of drained monotonic triaxial compression tests. The objective is to evaluate the effects of varying geocell heights (25, 50, and 100&#xa0;mm) and confining pressures (25, 50, and 75&#xa0;kPa) on the shear strength and volumetric response of dense sand (<i>D</i><sub><i>r</i></sub> = 80%). A single geocell layer was installed at mid-height in each specimen. The results show that geocell reinforcement transforms the stress–strain behaviour from strain-softening in unreinforced sand to strain-hardening in reinforced specimens. At a confining pressure of 50&#xa0;kPa, the peak deviatoric stress increased from 175&#xa0;kPa (unreinforced) to 343, 611, and 982&#xa0;kPa for geocell heights of 25, 50, and 100&#xa0;mm, respectively. Cohesion increased by up to 65&#xa0;kPa for <i>GH</i> = 50&#xa0;mm. Volumetric strain responses also demonstrated enhanced dilation and reduced contractive behaviour with reinforcement. Analytical estimation of the additional confining stress (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\varDelta\:\sigma\:}_{R}^{{\prime\:}}\)</EquationSource> </InlineEquation>) ranged from 5.5 to 21.7&#xa0;kPa, aligning with experimental trends. Among all configurations, <i>GH</i> = 50&#xa0;mm provided the best balance between strength gain and confinement efficiency. These findings confirm the effectiveness of geocell reinforcement in improving the mechanical behaviour of granular soils under drained loading conditions.</p>

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Mechanical Performance of a Geocell-Reinforced Sand: Laboratory Investigation Through Drained Monotonic Triaxial Tests

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Aymen Elouanas Asseli,
  • Adam Hamrouni,
  • Ismail Benessalah,
  • Stéphane Lambert,
  • Abderrahim Gheris

摘要

This study investigates the mechanical performance of Chlef sand reinforced with geocells, using a series of drained monotonic triaxial compression tests. The objective is to evaluate the effects of varying geocell heights (25, 50, and 100 mm) and confining pressures (25, 50, and 75 kPa) on the shear strength and volumetric response of dense sand (Dr = 80%). A single geocell layer was installed at mid-height in each specimen. The results show that geocell reinforcement transforms the stress–strain behaviour from strain-softening in unreinforced sand to strain-hardening in reinforced specimens. At a confining pressure of 50 kPa, the peak deviatoric stress increased from 175 kPa (unreinforced) to 343, 611, and 982 kPa for geocell heights of 25, 50, and 100 mm, respectively. Cohesion increased by up to 65 kPa for GH = 50 mm. Volumetric strain responses also demonstrated enhanced dilation and reduced contractive behaviour with reinforcement. Analytical estimation of the additional confining stress ( \(\:{\varDelta\:\sigma\:}_{R}^{{\prime\:}}\) ) ranged from 5.5 to 21.7 kPa, aligning with experimental trends. Among all configurations, GH = 50 mm provided the best balance between strength gain and confinement efficiency. These findings confirm the effectiveness of geocell reinforcement in improving the mechanical behaviour of granular soils under drained loading conditions.