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<p>Bioengineering using plant roots provides a critical nature-based solution for mitigating shallow slope failures. This study investigates the geotechnical stabilization mechanics of <i>Nandina domestica</i>—a fibrous-rooted shrub—within unsaturated clayey silt. A comprehensive laboratory program, including direct shear tests, root tensile testing, digital image processing, and sensitivity analysis, evaluated the coupled effects of root tensile strength, Root Area Ratio (RAR), Root Weight Density (RWD), moisture, and normal stress across four shallow depths (0–20 cm). Results showed that&#xa0;<i>N. domestica</i>&#xa0;significantly enhances structural integrity, increasing soil cohesion by an average of 79% and the internal friction angle by 30% compared to bare soil. Morphologically, thicker roots near the surface augmented peak shear strength, while denser networks of thinner roots (&lt; 2 mm) at deeper layers minimized shear settlement. The non-linear shear stress-displacement behavior of the root-soil composite was accurately captured using a hyperbolic elastic perfectly plastic constitutive model. Furthermore, sensitivity analysis identified normal stress, RWD, moisture, and depth as the primary parameters governing soil reinforcement. By integrating these variables, a newly proposed, modified Wu-Waldron model successfully corrected the traditional model's tendency to overestimate root-induced shear strength by up to 176%. This updated framework demonstrated robust predictive accuracy (R<sup>2</sup> &gt; 0.7) with minimized error metrics. Ultimately, this study establishes&#xa0;<i>N. domestica</i>&#xa0;as a highly effective, sustainable bioengineering tool for slope stabilization and erosion control.</p> Graphical abstract <p></p>

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Quantifying Nandina domestica roots contribution to soil reinforcement in unsaturated clayey silt: hyperbolic and modified models for root-soil interactions

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Masoud Ebrahimi Derakhshan,
  • Mehrab Ramzani,
  • Hamid Reza Razeghi,
  • Jaber Mamaghanian

摘要

Bioengineering using plant roots provides a critical nature-based solution for mitigating shallow slope failures. This study investigates the geotechnical stabilization mechanics of Nandina domestica—a fibrous-rooted shrub—within unsaturated clayey silt. A comprehensive laboratory program, including direct shear tests, root tensile testing, digital image processing, and sensitivity analysis, evaluated the coupled effects of root tensile strength, Root Area Ratio (RAR), Root Weight Density (RWD), moisture, and normal stress across four shallow depths (0–20 cm). Results showed that N. domestica significantly enhances structural integrity, increasing soil cohesion by an average of 79% and the internal friction angle by 30% compared to bare soil. Morphologically, thicker roots near the surface augmented peak shear strength, while denser networks of thinner roots (< 2 mm) at deeper layers minimized shear settlement. The non-linear shear stress-displacement behavior of the root-soil composite was accurately captured using a hyperbolic elastic perfectly plastic constitutive model. Furthermore, sensitivity analysis identified normal stress, RWD, moisture, and depth as the primary parameters governing soil reinforcement. By integrating these variables, a newly proposed, modified Wu-Waldron model successfully corrected the traditional model's tendency to overestimate root-induced shear strength by up to 176%. This updated framework demonstrated robust predictive accuracy (R2 > 0.7) with minimized error metrics. Ultimately, this study establishes N. domestica as a highly effective, sustainable bioengineering tool for slope stabilization and erosion control.

Graphical abstract