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<p>Slope failure poses a significant threat to infrastructure, particularly in regions with heterogeneous soil profiles and steep embankments. This study explores the use of vetiver grass (Chrysopogon zizanioides) as a sustainable bioengineering solution to enhance slope stability across varying geotechnical conditions. The stabilizing effects of vetiver root systems were evaluated on slopes composed of laterite soil and sand-laterite mixtures using GeoSlope’s SLOPE/W module. Slope configurations with angles of 10°, 20°, 30°, 45°, 60°, and 75° were analyzed to assess performance under diverse geometries. Soil properties—cohesion, internal friction angle, and unit weight—were derived from laboratory testing and supplemented with literature values. Vetiver reinforcement was modeled through root-induced cohesion enhancement and adjusted shear strength parameters. The results demonstrate that vetiver grass significantly improves the Factor of Safety (FoS) across all tested conditions, particularly in cohesive soils at moderate slope angles. Reinforced slopes showed delayed failure onset, reduced shear strain, and greater resistance to sliding. The 20% sand-laterite mix with vetiver yielded the most favorable stability outcomes. These findings confirm the potential of Vetiver grass as an environmentally sustainable bioengineering approach for stabilizing vulnerable embankments, especially in areas prone to rainfall-induced failures and erosion. The study contributes to advancing sustainable and practical alternatives to conventional slope reinforcement techniques.</p>

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Vetiver grass for sustainable slope stabilization: a geoslope-based study on laterite and sand-laterite embankments

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Rinitha P,
  • Vandana Sreedharan

摘要

Slope failure poses a significant threat to infrastructure, particularly in regions with heterogeneous soil profiles and steep embankments. This study explores the use of vetiver grass (Chrysopogon zizanioides) as a sustainable bioengineering solution to enhance slope stability across varying geotechnical conditions. The stabilizing effects of vetiver root systems were evaluated on slopes composed of laterite soil and sand-laterite mixtures using GeoSlope’s SLOPE/W module. Slope configurations with angles of 10°, 20°, 30°, 45°, 60°, and 75° were analyzed to assess performance under diverse geometries. Soil properties—cohesion, internal friction angle, and unit weight—were derived from laboratory testing and supplemented with literature values. Vetiver reinforcement was modeled through root-induced cohesion enhancement and adjusted shear strength parameters. The results demonstrate that vetiver grass significantly improves the Factor of Safety (FoS) across all tested conditions, particularly in cohesive soils at moderate slope angles. Reinforced slopes showed delayed failure onset, reduced shear strain, and greater resistance to sliding. The 20% sand-laterite mix with vetiver yielded the most favorable stability outcomes. These findings confirm the potential of Vetiver grass as an environmentally sustainable bioengineering approach for stabilizing vulnerable embankments, especially in areas prone to rainfall-induced failures and erosion. The study contributes to advancing sustainable and practical alternatives to conventional slope reinforcement techniques.