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<p>This study investigates the impact of uniaxial and biaxial geogrids on subgrade strength improvement in flexible pavements using California Bearing Ratio tests. Tests were conducted on subgrade soil samples reinforced with geogrids at varying depths from the top: 0.25H, 0.5H, and 0.75H for single layers and 0.25H, 0.75H, and 0.33H, 0.67H for double layers. The results showed maximum California Bearing Ratio values with single-layer geogrid at 0.25H and double-layer geogrid at 0.33H and 0. 67H. The single layer biaxial geogrid at 0.25H showed the highest soaked California Bearing Ratio value of 10.2%. The unsoaked California Bearing Ratio value increased from 6.61% (control) to 13.8% for the same conditions. For the double layer biaxial geogrid reinforcement at depths 0.33H and 0.67H, the soaked and unsoaked California Bearing Ratio values were 11.8% and 16.99%, respectively. These findings confirm that geogrid reinforcement significantly improves subgrade strength and can therefore be adopted to minimize stresses and deflections in the design of flexible road pavements. The optimal placement of reinforcing elements in single and double-layer systems can be ascertained through additional laboratory testing of geogrid-reinforced subgrade systems.</p>

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Geotechnical Performance of Geogrid-Reinforced Subgrades for Flexible Pavement Systems in the Himalayan Region

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • B. A. Mir,
  • Syed Mudasir Gulzar,
  • K. M. N. Saquib Wani

摘要

This study investigates the impact of uniaxial and biaxial geogrids on subgrade strength improvement in flexible pavements using California Bearing Ratio tests. Tests were conducted on subgrade soil samples reinforced with geogrids at varying depths from the top: 0.25H, 0.5H, and 0.75H for single layers and 0.25H, 0.75H, and 0.33H, 0.67H for double layers. The results showed maximum California Bearing Ratio values with single-layer geogrid at 0.25H and double-layer geogrid at 0.33H and 0. 67H. The single layer biaxial geogrid at 0.25H showed the highest soaked California Bearing Ratio value of 10.2%. The unsoaked California Bearing Ratio value increased from 6.61% (control) to 13.8% for the same conditions. For the double layer biaxial geogrid reinforcement at depths 0.33H and 0.67H, the soaked and unsoaked California Bearing Ratio values were 11.8% and 16.99%, respectively. These findings confirm that geogrid reinforcement significantly improves subgrade strength and can therefore be adopted to minimize stresses and deflections in the design of flexible road pavements. The optimal placement of reinforcing elements in single and double-layer systems can be ascertained through additional laboratory testing of geogrid-reinforced subgrade systems.