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<p>The sustainable utilization of tailings sand is vital for environmental protection and geotechnical applications. This study proposes a reinforcement method combining enzyme-induced carbonate precipitation (EICP) with basalt fiber reinforcement, focusing on the effect of fiber length on the mechanical behavior of tailings sand. Uniaxial compression, direct tensile tests, digital image correlation (DIC), and scanning electron microscopy (SEM) were employed to investigate reinforcement mechanisms and failure characteristics. Results show that EICP-fiber treatment significantly enhances both compressive and tensile strength and alters the failure mode. Specimens with 12&#xa0;mm fibers exhibit the highest compressive strength and improved plasticity, while 6&#xa0;mm fibers yield the highest tensile strength, greatest failure displacement, and best crack resistance, contributing to enhanced ductility. As fiber length increases, the tensile reinforcement effect declines, with 18&#xa0;mm fibers showing reduced performance due to fiber entanglement and stress shielding. DIC results reveal more uniform strain fields, improved deformation stability, and reduced tensile failure in reinforced specimens. SEM analysis indicates that fibers promote calcium carbonate precipitation, forming a dense “fiber-CaCO<sub>3</sub>-sand” network that improves particle bonding and structural integrity. This EICP-fiber method effectively strengthens tailings sand, and optimal fiber length is key to performance and sustainable engineering use.</p>

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Effect of Basalt Fiber Length on Mechanical Behavior of EICP-Reinforced Tailings Sand

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Linxian Gong,
  • Tingchen Hao,
  • Xiaokai Ji,
  • Zhazha Hu,
  • Yan Xu,
  • Fayang Guo

摘要

The sustainable utilization of tailings sand is vital for environmental protection and geotechnical applications. This study proposes a reinforcement method combining enzyme-induced carbonate precipitation (EICP) with basalt fiber reinforcement, focusing on the effect of fiber length on the mechanical behavior of tailings sand. Uniaxial compression, direct tensile tests, digital image correlation (DIC), and scanning electron microscopy (SEM) were employed to investigate reinforcement mechanisms and failure characteristics. Results show that EICP-fiber treatment significantly enhances both compressive and tensile strength and alters the failure mode. Specimens with 12 mm fibers exhibit the highest compressive strength and improved plasticity, while 6 mm fibers yield the highest tensile strength, greatest failure displacement, and best crack resistance, contributing to enhanced ductility. As fiber length increases, the tensile reinforcement effect declines, with 18 mm fibers showing reduced performance due to fiber entanglement and stress shielding. DIC results reveal more uniform strain fields, improved deformation stability, and reduced tensile failure in reinforced specimens. SEM analysis indicates that fibers promote calcium carbonate precipitation, forming a dense “fiber-CaCO3-sand” network that improves particle bonding and structural integrity. This EICP-fiber method effectively strengthens tailings sand, and optimal fiber length is key to performance and sustainable engineering use.