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<p>This study investigates the shear behavior of soil adjacent to a surface-modified geotextile (SMGT) under constant water content conditions using direct shear tests. The effects of shear displacement rate and surface roughness on the measured total-stress shear response were examined. The geotextile surface was modified using sand particles with nominal sizes of 0.5, 1.0, and 2.0&#xa0;mm, producing four initial roughness levels, including the unmodified geotextile. The results show that all shear stress–displacement curves exhibited strain-hardening behavior, and the shear displacement rate had limited influence on the overall curve shape. However, the vertical displacement response was sensitive to shear displacement rate, especially under higher normal stress. Under the smooth roughness condition and normal stress of 25&#xa0;kPa, the shear strength increased from 34.5 to 44.6&#xa0;kPa as the shear displacement rate increased from 0.1 to 1.2&#xa0;mm/min. At a shear displacement rate of 0.8&#xa0;mm/min and a normal stress of 25&#xa0;kPa, increasing the surface roughness from smooth to severely roughness increased the shear strength by 47.7%. The apparent adhesion showed a stronger rate-dependent response than the friction angle, which changed only slightly with increasing shear displacement rate. These findings indicate that surface roughness and shear displacement rate jointly influence the apparent shear response of soil near roughened geotextile surfaces under constant water content conditions.</p>

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Effect of Surface Roughness on Soil and Geotextile Interface Shear Behavior Under Constant Water Content

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Feng Yue,
  • Boyang Liu,
  • Pengfei He,
  • Xiangbing Kong,
  • Ruige Shi,
  • Fuping Zhang

摘要

This study investigates the shear behavior of soil adjacent to a surface-modified geotextile (SMGT) under constant water content conditions using direct shear tests. The effects of shear displacement rate and surface roughness on the measured total-stress shear response were examined. The geotextile surface was modified using sand particles with nominal sizes of 0.5, 1.0, and 2.0 mm, producing four initial roughness levels, including the unmodified geotextile. The results show that all shear stress–displacement curves exhibited strain-hardening behavior, and the shear displacement rate had limited influence on the overall curve shape. However, the vertical displacement response was sensitive to shear displacement rate, especially under higher normal stress. Under the smooth roughness condition and normal stress of 25 kPa, the shear strength increased from 34.5 to 44.6 kPa as the shear displacement rate increased from 0.1 to 1.2 mm/min. At a shear displacement rate of 0.8 mm/min and a normal stress of 25 kPa, increasing the surface roughness from smooth to severely roughness increased the shear strength by 47.7%. The apparent adhesion showed a stronger rate-dependent response than the friction angle, which changed only slightly with increasing shear displacement rate. These findings indicate that surface roughness and shear displacement rate jointly influence the apparent shear response of soil near roughened geotextile surfaces under constant water content conditions.