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<p>Understanding soil–geogrid interaction is essential for the safe and cost-effective design of reinforced soil structures. Geogrid ribs play a key role in governing this interaction; therefore, the present study investigates the effects of modifying rib geometry and thickness on the shear behavior of reinforced soils. Large-scale direct shear tests were performed on fine, medium and coarse granular soils reinforced with straight- and chevron-shaped ribs of 2, 4 and 6&#xa0;mm thickness. The samples were subjected to normal stresses of 25, 50 and 75&#xa0;kPa to evaluate the influence of confinement on interface behavior. Additionally, finite element analysis (FEA) was conducted using PLAXIS 3D software to support the interpretation and justification of laboratory findings. The results demonstrated that the shear strength at the soil–geogrid interface is significantly influenced by the transverse rib thickness and geometry. Samples reinforced with chevron-shaped ribs exhibited improved interaction performance compared to those reinforced with straight-shaped ribs. Reinforcement with G<sub>S-6</sub> and G<sub>T-6</sub> geogrids enhanced the interaction friction angles at the interface by 17 and 20% in S1 samples, 13 and 16% in S2 samples, and 4 and 7% in S3 samples, respectively. The numerical analysis further corroborated the experimental findings, revealing an increased shear zone thickness associated with modifications in rib geometry and thickness.</p>

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Experimental and Numerical Investigation of Modified Geogrid Transverse Ribs on Soil–Geogrid Interaction in Direct Shear

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • M. R. Abdi,
  • P. Haghgouy

摘要

Understanding soil–geogrid interaction is essential for the safe and cost-effective design of reinforced soil structures. Geogrid ribs play a key role in governing this interaction; therefore, the present study investigates the effects of modifying rib geometry and thickness on the shear behavior of reinforced soils. Large-scale direct shear tests were performed on fine, medium and coarse granular soils reinforced with straight- and chevron-shaped ribs of 2, 4 and 6 mm thickness. The samples were subjected to normal stresses of 25, 50 and 75 kPa to evaluate the influence of confinement on interface behavior. Additionally, finite element analysis (FEA) was conducted using PLAXIS 3D software to support the interpretation and justification of laboratory findings. The results demonstrated that the shear strength at the soil–geogrid interface is significantly influenced by the transverse rib thickness and geometry. Samples reinforced with chevron-shaped ribs exhibited improved interaction performance compared to those reinforced with straight-shaped ribs. Reinforcement with GS-6 and GT-6 geogrids enhanced the interaction friction angles at the interface by 17 and 20% in S1 samples, 13 and 16% in S2 samples, and 4 and 7% in S3 samples, respectively. The numerical analysis further corroborated the experimental findings, revealing an increased shear zone thickness associated with modifications in rib geometry and thickness.