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<p>Reducing conventional steel reinforcement in shield tunnel segments is important for lowering material consumption and material-related carbon emissions while maintaining structural performance. This study evaluates the use of Barchip54 synthetic fibers as a partial reinforcement alternative by combining mechanical tests on synthetic fiber-reinforced concrete, segment-level analyses under ultimate and serviceability limit states, and a material-production-stage carbon-emission calculation. Compressive strength, flexural response, plate energy absorption, and segment behavior were examined for concrete with different fiber dosages, and the test results showed that fiber incorporation changed the flexural failure mode from brittle fracture to a more ductile post-cracking response while improving residual load-carrying capacity and energy absorption. For the adopted segment configuration, the numerical analysis indicated an approximate 40% reduction in conventional steel reinforcement under the ultimate limit state and serviceability-based reduction ratios of 28–36% at burial depths of 15–25&#xa0;m. Based on the corresponding steel-reduction results, the material-related carbon-emission reduction was estimated as 16–31%, indicating the combined structural and carbon-emission effect of partial steel replacement with synthetic fibers in shield tunnel segments.</p>

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Steel Substitution Potential of Synthetic Fiber-Reinforced Concrete Segments for Shield Tunnels: Mechanical Performance and Carbon Reduction

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Haosong Li,
  • Lei Kou

摘要

Reducing conventional steel reinforcement in shield tunnel segments is important for lowering material consumption and material-related carbon emissions while maintaining structural performance. This study evaluates the use of Barchip54 synthetic fibers as a partial reinforcement alternative by combining mechanical tests on synthetic fiber-reinforced concrete, segment-level analyses under ultimate and serviceability limit states, and a material-production-stage carbon-emission calculation. Compressive strength, flexural response, plate energy absorption, and segment behavior were examined for concrete with different fiber dosages, and the test results showed that fiber incorporation changed the flexural failure mode from brittle fracture to a more ductile post-cracking response while improving residual load-carrying capacity and energy absorption. For the adopted segment configuration, the numerical analysis indicated an approximate 40% reduction in conventional steel reinforcement under the ultimate limit state and serviceability-based reduction ratios of 28–36% at burial depths of 15–25 m. Based on the corresponding steel-reduction results, the material-related carbon-emission reduction was estimated as 16–31%, indicating the combined structural and carbon-emission effect of partial steel replacement with synthetic fibers in shield tunnel segments.