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<p>Against the backdrop of global climate change, frequent heavy rainfall has increasingly highlighted the stability issues of earthen slopes. Vegetation bags, serving as green infrastructure that combines engineering protection with ecological restoration, have seen widespread application in slope management in recent years. This study selected three plant species - <i>Tall fescue</i>, <i>Setaria viridis</i>, and <i>Amorpha fruticosa</i> - to conduct laboratory experiments systematically investigating the mechanical and hydrological properties of root-soil-bag composites. The research encompassed root morphology and tensile properties, direct shear tests on root-soil composites, root-soil-bag permeability tests, artificial rainfall interception experiments, and slope model stability tests. The results indicate: (1) Plant roots significantly enhance soil shear strength, with <i>Tall fescue</i> demonstrating optimal performance; (2) Permeability coefficient of root-soil-bag composites increases with vegetation density; (3) Vegetation effectively intercepts rainfall and mitigates slope runoff, with high-density communities exhibiting superior retention capacity during intense rainfall events; (4) Vegetated geobags significantly reduced slope water loss and erosion, with staggered placement outperforming parallel arrangements. Collectively, vegetated bags enhance slope stability through a multi-faceted mechanism of ‘canopy rainfall interception-root reinforcement-bag retention’, demonstrating potential for both engineering and ecological applications under extreme climatic conditions.</p>

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Study on the mechanical and hydrological properties of vegetation bag root-soil-bag composites under heavy rainfall conditions

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Zhen Yang,
  • Jiong Zhang,
  • Jie Ding,
  • Mingwan Zheng,
  • Zhaoyi Zheng,
  • Jiaqi Lu,
  • Lingcen Kong,
  • Jia Liu,
  • Zhao Hou

摘要

Against the backdrop of global climate change, frequent heavy rainfall has increasingly highlighted the stability issues of earthen slopes. Vegetation bags, serving as green infrastructure that combines engineering protection with ecological restoration, have seen widespread application in slope management in recent years. This study selected three plant species - Tall fescue, Setaria viridis, and Amorpha fruticosa - to conduct laboratory experiments systematically investigating the mechanical and hydrological properties of root-soil-bag composites. The research encompassed root morphology and tensile properties, direct shear tests on root-soil composites, root-soil-bag permeability tests, artificial rainfall interception experiments, and slope model stability tests. The results indicate: (1) Plant roots significantly enhance soil shear strength, with Tall fescue demonstrating optimal performance; (2) Permeability coefficient of root-soil-bag composites increases with vegetation density; (3) Vegetation effectively intercepts rainfall and mitigates slope runoff, with high-density communities exhibiting superior retention capacity during intense rainfall events; (4) Vegetated geobags significantly reduced slope water loss and erosion, with staggered placement outperforming parallel arrangements. Collectively, vegetated bags enhance slope stability through a multi-faceted mechanism of ‘canopy rainfall interception-root reinforcement-bag retention’, demonstrating potential for both engineering and ecological applications under extreme climatic conditions.