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<p>Expansive soil slopes are sensitive to climatic variations due to their swell-shrinkage behaviour during wetting and drying cycles, reducing shear strength, leading to failures. In recent decades, the use of geosynthetics and chemical stabilization techniques has gained attention for improving the performance and long-term stability of expansive soil slopes. However, research on the combined use of these methods remains limited. This study evaluates the effectiveness of integrating geogrid reinforcement with chemical stabilization across various slope geometries and soil types, aiming to achieve the required factor of safety (FOS) while minimizing costs. Slope stability analyses were conducted using finite element method (FEM)-based PLAXIS 2D and limit equilibrium method (LEM)-based SLOPE/W, with material properties obtained from laboratory experiments. A comprehensive parametric study considered slope heights (4–16&#xa0;m), slope angles (30°–75°), soil types (moderately and highly expansive), stabilization lengths (0.7–2.0 times slope height), geogrid spacings (1.0, 0.5, and 0.25&#xa0;m), and chemical binders (ordinary Portland cement (OPC), lime, and fly ash (FA)). The results indicate that chemical stabilization alone is effective only for milder slopes (slope angle &lt; 45°). In addition, compared to geogrid stabilization alone, the combined application of geogrids and chemical binders allows larger maximum spacing for the given stabilization lengths, especially for steeper slopes (slope angle &gt; 45°). Overall, while the use of a single stabilization method suffices for milder slopes (slope angle &lt; 45°), the combination of geogrid + lime provides the most efficient and cost-effective solution for steeper expansive soil slopes (slope angle &gt; 45°).</p>

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Stability Analysis of Expansive Soil Slopes Stabilized with a Combination of Geogrids and Different Chemical Binders

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • M. N. Nifal,
  • M. C. M. Nasvi,
  • L. C. Kurukulasuriya

摘要

Expansive soil slopes are sensitive to climatic variations due to their swell-shrinkage behaviour during wetting and drying cycles, reducing shear strength, leading to failures. In recent decades, the use of geosynthetics and chemical stabilization techniques has gained attention for improving the performance and long-term stability of expansive soil slopes. However, research on the combined use of these methods remains limited. This study evaluates the effectiveness of integrating geogrid reinforcement with chemical stabilization across various slope geometries and soil types, aiming to achieve the required factor of safety (FOS) while minimizing costs. Slope stability analyses were conducted using finite element method (FEM)-based PLAXIS 2D and limit equilibrium method (LEM)-based SLOPE/W, with material properties obtained from laboratory experiments. A comprehensive parametric study considered slope heights (4–16 m), slope angles (30°–75°), soil types (moderately and highly expansive), stabilization lengths (0.7–2.0 times slope height), geogrid spacings (1.0, 0.5, and 0.25 m), and chemical binders (ordinary Portland cement (OPC), lime, and fly ash (FA)). The results indicate that chemical stabilization alone is effective only for milder slopes (slope angle < 45°). In addition, compared to geogrid stabilization alone, the combined application of geogrids and chemical binders allows larger maximum spacing for the given stabilization lengths, especially for steeper slopes (slope angle > 45°). Overall, while the use of a single stabilization method suffices for milder slopes (slope angle < 45°), the combination of geogrid + lime provides the most efficient and cost-effective solution for steeper expansive soil slopes (slope angle > 45°).