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<p>Red soil, rich in hydrophilic minerals, is highly susceptible to cracking under repeated freeze–thaw cycles, which can lead to severe engineering problems such as subgrade instability and slope failure. To improve its mechanical performance, this study utilizes polypropylene fiber reinforcement to modify Yunnan red soil. A series of Brazilian splitting tests were conducted to systematically investigate the effects of fiber length (6–19&#xa0;mm) and reinforcement ratio (0.1–0.6%) on the tensile strength of the reinforced soil. By integrating scanning electron microscopy (SEM) observations with PFC2D discrete element simulations, the reinforcement mechanisms were elucidated across multiple scales. The results indicate that a fiber length of 6&#xa0;mm and a content of 0.2% provide optimal reinforcement, resulting in a 178.82% increase in tensile strength compared with unreinforced soil. In contrast, longer fibers (19&#xa0;mm) exhibit degraded performance at higher contents owing to fiber entanglement. Numerical simulations further demonstrate that an appropriate fiber content disperses stress chains, enhances energy dissipation, and produces more tortuous crack propagation paths, thereby transforming the failure mode from brittle to ductile. Finally, a multiscale correlation model was developed to link fiber parameters, microstructural characteristics, and macroscopic mechanical behavior, thereby providing a theoretical basis for slope stabilization and subgrade reinforcement in lateritic regions.</p>

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Tensile Strength of Polypropylene Fiber-Reinforced Red Soil: Mechanism of Fiber Length and Dosage Effects Through Experimental Investigation and DEM Modeling

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Yin-Lei Sun,
  • Jun-Lei Chen,
  • Ke-Meng Tian,
  • Han-Ting Zhou,
  • Wei Luo,
  • Yi-Fu Ming,
  • Si-Yao Zhou,
  • Xian-Wei Zhang

摘要

Red soil, rich in hydrophilic minerals, is highly susceptible to cracking under repeated freeze–thaw cycles, which can lead to severe engineering problems such as subgrade instability and slope failure. To improve its mechanical performance, this study utilizes polypropylene fiber reinforcement to modify Yunnan red soil. A series of Brazilian splitting tests were conducted to systematically investigate the effects of fiber length (6–19 mm) and reinforcement ratio (0.1–0.6%) on the tensile strength of the reinforced soil. By integrating scanning electron microscopy (SEM) observations with PFC2D discrete element simulations, the reinforcement mechanisms were elucidated across multiple scales. The results indicate that a fiber length of 6 mm and a content of 0.2% provide optimal reinforcement, resulting in a 178.82% increase in tensile strength compared with unreinforced soil. In contrast, longer fibers (19 mm) exhibit degraded performance at higher contents owing to fiber entanglement. Numerical simulations further demonstrate that an appropriate fiber content disperses stress chains, enhances energy dissipation, and produces more tortuous crack propagation paths, thereby transforming the failure mode from brittle to ductile. Finally, a multiscale correlation model was developed to link fiber parameters, microstructural characteristics, and macroscopic mechanical behavior, thereby providing a theoretical basis for slope stabilization and subgrade reinforcement in lateritic regions.