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<p>Loess slopes, characterized by their unique geological properties, encounter significant challenges, particularly due to water infiltration and erosion. Therefore, sesbania gum is used to stabilize the surface soil of loess slopes to control rainfall-induced erosion. This study reveal that samples modified with the optimal content of 10% sesbania gum exhibited a remarkably increased impermeability and surface hardness of loess sample. Extended curing time further led to an increase in impermeability and hardness, as thorough gelation and uniform water distribution facilitated stronger cross-linking among soil particles. Furthermore, despite the formation of small cracks on the air-dried sample after multiple permeation cycles, the sesbania gum-modified loess sample demonstrated remarkable self-healing capabilities, maintaining low permeability and structural integrity. Notably, the formation of a protective surface layer in the indoor slope model greatly enhanced erosion resistance, prolonging the slope failure time from 74&#xa0;min to 848&#xa0;min under extremely intense rainfall conditions (rainfall intensity of 2.4&#xa0;mm/min). Analyses of scanning electron microscopy (SEM) reveal that the sesbania gum-modified loess sample has a smoother and more compact loess particle matrix with reduced porosity. Finally, field test results also show that sesbania gum biopolymer provides a potentially effective and long-term strategy for loess slope protection.</p>

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Investigation of anti-seepage and erosion resistance properties in sesbania gum-modified loess slopes

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Minjie Sun,
  • Zhenxiao Li,
  • Zhen Guo,
  • Yanrong Li

摘要

Loess slopes, characterized by their unique geological properties, encounter significant challenges, particularly due to water infiltration and erosion. Therefore, sesbania gum is used to stabilize the surface soil of loess slopes to control rainfall-induced erosion. This study reveal that samples modified with the optimal content of 10% sesbania gum exhibited a remarkably increased impermeability and surface hardness of loess sample. Extended curing time further led to an increase in impermeability and hardness, as thorough gelation and uniform water distribution facilitated stronger cross-linking among soil particles. Furthermore, despite the formation of small cracks on the air-dried sample after multiple permeation cycles, the sesbania gum-modified loess sample demonstrated remarkable self-healing capabilities, maintaining low permeability and structural integrity. Notably, the formation of a protective surface layer in the indoor slope model greatly enhanced erosion resistance, prolonging the slope failure time from 74 min to 848 min under extremely intense rainfall conditions (rainfall intensity of 2.4 mm/min). Analyses of scanning electron microscopy (SEM) reveal that the sesbania gum-modified loess sample has a smoother and more compact loess particle matrix with reduced porosity. Finally, field test results also show that sesbania gum biopolymer provides a potentially effective and long-term strategy for loess slope protection.