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<p>Interaction between soil and reinforcement is a complex phenomenon governed by the combined effects of interface frictional resistance and the passive bearing generated by soil. This study examines the influence of varying coir geotextile mass densities (400–1600 grams per square meter—GSM) and different normal loads on soil-geotextile interaction mechanisms during pullout loading using combined physical and numerical modeling. The experimental findings showed a 110% increment in peak pullout resistance when the mass density of the geotextile increases from 400 GSM to 1600 GSM. Likewise, with an increment in normal load from 0.5 kN to 1.5 kN, there is a 100% increase in peak pullout resistance for 900 GSM compared to 400 GSM geotextile. Furthermore, to examine the stress and displacement profile of the geotextile within the soil and the relative contribution of the frictional and bearing resistance arising from the soil-geotextile interaction, a 3D numerical model was developed and validated against the experimental results. The stress and displacement profile of the 900 GSM geotextile exhibits a nonlinear variation, with the maximum stress and displacement occurring near the clamping region. Additionally, the numerical analysis also revealed that 1600 and 900 GSM geotextiles exhibited a relatively higher bearing resistance i.e., about 98% and 87% higher than 400 GSM geotextiles. This indicates that bearing is predominant in geotextiles with higher mass densities, whereas frictional resistance is dominant in geotextiles with lower mass densities.</p>

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Frictional and bearing resistance of coir geotextile-reinforced soil with varying mass density

  • 期刊论文

  • 发表日期：

    2026年7月26日

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  • Nitish Kumar,
  • Megha S. Narayanan,
  • Ramesh Kannan Kandasami

摘要

Interaction between soil and reinforcement is a complex phenomenon governed by the combined effects of interface frictional resistance and the passive bearing generated by soil. This study examines the influence of varying coir geotextile mass densities (400–1600 grams per square meter—GSM) and different normal loads on soil-geotextile interaction mechanisms during pullout loading using combined physical and numerical modeling. The experimental findings showed a 110% increment in peak pullout resistance when the mass density of the geotextile increases from 400 GSM to 1600 GSM. Likewise, with an increment in normal load from 0.5 kN to 1.5 kN, there is a 100% increase in peak pullout resistance for 900 GSM compared to 400 GSM geotextile. Furthermore, to examine the stress and displacement profile of the geotextile within the soil and the relative contribution of the frictional and bearing resistance arising from the soil-geotextile interaction, a 3D numerical model was developed and validated against the experimental results. The stress and displacement profile of the 900 GSM geotextile exhibits a nonlinear variation, with the maximum stress and displacement occurring near the clamping region. Additionally, the numerical analysis also revealed that 1600 and 900 GSM geotextiles exhibited a relatively higher bearing resistance i.e., about 98% and 87% higher than 400 GSM geotextiles. This indicates that bearing is predominant in geotextiles with higher mass densities, whereas frictional resistance is dominant in geotextiles with lower mass densities.