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<p>To advance ecological and environmental protection, this study investigates the stabilization of expansive soil using eco-friendly polymers to reduce the ecological impact of conventional stabilization methods. Laboratory mechanical tests and microscopic analyses were conducted to evaluate the strength and deformation characteristics of expansive soil stabilized with sodium polyacrylate. Results show that sodium polyacrylate effectively reduces both the swelling rate and swelling pressure of the stabilized expansive soil. After stabilization, the free swelling ratio decreased by 54.57%, and the swelling pressure decreased by 15–57%. Under unloaded and loaded conditions, the swelling ratio decreased by 38.42% and 92.82%, respectively. The shear strength of stabilized expansive soil increased linearly with everyday stress under different stabilizers. After 60&#xa0;days of curing, the axial strain curve of the stabilized expansive soil displayed hardening under low stress and softening under high stress. The axial deformation rate decreased with increasing stabilizer dosage and approached zero as the everyday stress increased. The unconfined compressive strength (UCS) initially increased and then decreased with increasing dosage of the stabilizer. Between 7 and 14&#xa0;days of curing, the strength growth rate peaked at 16.96&#xa0;kPa/day. The failure strain decreased with increasing stabilizer content, reaching a minimum at 4% admixture. With further increase in stabilizer dosage, the plasticity of the stabilized expansive soil gradually increased. During stabilization, a water-based hydrogel film formed on soil particle surfaces, enhancing interparticle cohesion and reducing particle mobility. No new mineral phases formed in the stabilized expansive soil, whereas the proportion of hydrophilic minerals decreased by 43.14%.Additionally, both the number and size of soil pores decreased, resulting in a denser packing of particles.</p>

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Study on the mechanical deformation characteristics of expansive soil under the action of sodium polyacrylate

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Yueshun Chen,
  • Zhenrui Liao,
  • Wangjin Niu,
  • Yiming Hu,
  • Hang Tan,
  • Wentao Hu

摘要

To advance ecological and environmental protection, this study investigates the stabilization of expansive soil using eco-friendly polymers to reduce the ecological impact of conventional stabilization methods. Laboratory mechanical tests and microscopic analyses were conducted to evaluate the strength and deformation characteristics of expansive soil stabilized with sodium polyacrylate. Results show that sodium polyacrylate effectively reduces both the swelling rate and swelling pressure of the stabilized expansive soil. After stabilization, the free swelling ratio decreased by 54.57%, and the swelling pressure decreased by 15–57%. Under unloaded and loaded conditions, the swelling ratio decreased by 38.42% and 92.82%, respectively. The shear strength of stabilized expansive soil increased linearly with everyday stress under different stabilizers. After 60 days of curing, the axial strain curve of the stabilized expansive soil displayed hardening under low stress and softening under high stress. The axial deformation rate decreased with increasing stabilizer dosage and approached zero as the everyday stress increased. The unconfined compressive strength (UCS) initially increased and then decreased with increasing dosage of the stabilizer. Between 7 and 14 days of curing, the strength growth rate peaked at 16.96 kPa/day. The failure strain decreased with increasing stabilizer content, reaching a minimum at 4% admixture. With further increase in stabilizer dosage, the plasticity of the stabilized expansive soil gradually increased. During stabilization, a water-based hydrogel film formed on soil particle surfaces, enhancing interparticle cohesion and reducing particle mobility. No new mineral phases formed in the stabilized expansive soil, whereas the proportion of hydrophilic minerals decreased by 43.14%.Additionally, both the number and size of soil pores decreased, resulting in a denser packing of particles.