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<p>Organic soils are characterized by low shear strength and high compressibility, which pose significant challenges in geotechnical engineering. This study investigates the shear strength behavior and constitutive response of organic soil stabilized with locust bean gum (LBG), an environmentally sustainable biopolymer binder. A series of unconsolidated undrained (UU) triaxial tests was conducted under confining pressures of 50, 100, 200, and 300&#xa0;kPa on specimens treated with varying LBG contents (0–2.5%) and cured for 3–28&#xa0;days. The effects of LBG dosage and curing time on stress–strain behavior, shear strength parameters, cohesion, and internal friction angle were systematically examined. The results indicate that LBG stabilization significantly enhances the shear strength of organic soil, with an optimal content of approximately 2.0%. At a confining pressure of 50&#xa0;kPa and a curing age of 28&#xa0;days, the shear strength was approximately 98% higher than that of the untreated soil. This improvement was mainly attributed to increased cohesion, whereas the internal friction angle changed only slightly. In addition, longer curing periods further improved stabilization, reflecting the progressive formation and dehydration of a biopolymer gel network within the soil structure. The Duncan-Chang hyperbolic constitutive model was modified and calibrated to nonlinear the nonlinear stress–strain behavior of LBG-stabilized organic soil. The normalized stress–strain relationship based on the ultimate deviator stress agrees well with experimental data, particularly under medium to high confining pressures. These findings confirm the effectiveness of LBG as a sustainable stabilizer for organic soils and provide constitutive parameters that can be used in geotechnical analysis and design.</p>

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Stabilization of organic soil using locust bean gum biopolymer: A study on shear strength parameters

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Lina Wang,
  • Xiuyin Ding,
  • Xianfei Shen,
  • Zitao Guo

摘要

Organic soils are characterized by low shear strength and high compressibility, which pose significant challenges in geotechnical engineering. This study investigates the shear strength behavior and constitutive response of organic soil stabilized with locust bean gum (LBG), an environmentally sustainable biopolymer binder. A series of unconsolidated undrained (UU) triaxial tests was conducted under confining pressures of 50, 100, 200, and 300 kPa on specimens treated with varying LBG contents (0–2.5%) and cured for 3–28 days. The effects of LBG dosage and curing time on stress–strain behavior, shear strength parameters, cohesion, and internal friction angle were systematically examined. The results indicate that LBG stabilization significantly enhances the shear strength of organic soil, with an optimal content of approximately 2.0%. At a confining pressure of 50 kPa and a curing age of 28 days, the shear strength was approximately 98% higher than that of the untreated soil. This improvement was mainly attributed to increased cohesion, whereas the internal friction angle changed only slightly. In addition, longer curing periods further improved stabilization, reflecting the progressive formation and dehydration of a biopolymer gel network within the soil structure. The Duncan-Chang hyperbolic constitutive model was modified and calibrated to nonlinear the nonlinear stress–strain behavior of LBG-stabilized organic soil. The normalized stress–strain relationship based on the ultimate deviator stress agrees well with experimental data, particularly under medium to high confining pressures. These findings confirm the effectiveness of LBG as a sustainable stabilizer for organic soils and provide constitutive parameters that can be used in geotechnical analysis and design.