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<p>With the widespread adoption of Earth Pressure Balance (EPB) shield tunneling technology, urban subway construction generates a substantial amount of waste muck, necessitating efficient recycling and reuse technologies. This study focuses on the silty clay muck from the northern section of Shenyang Metro Line 6, and develops a bentonite-silty clay modified slurry (BSC) to achieve in-situ resource utilization of the muck. Through slump tests, a self-developed pressurized vane shear apparatus, and field trials, the effects of BSC on the workability, compressibility, and shear strength of sandy soil were systematically evaluated. The results indicate that, in comparison with bentonite slurry, BSC is an effective alternative for improving the workability, compressibility, and shear strength of conditioned sands. The pressurized shear test enables the establishment of a relationship between soil conditioning methods and the mechanical properties of conditioned soil, which is crucial for dynamically adjusting the conditioning schemes based on real-time tunneling data from EPB shield machines. Field tests reveal that the utilization of BSC leads to a 13.54% reduction in cutterhead torque and a 12.15% decrease in total thrust force. This study contributes to the development of sustainable and economical solutions for soil conditioning in urban tunnel projects, particularly by utilizing excavated materials effectively.</p>

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Reuse of discharged silty clay from EPB shield tunnel construction as soil conditioning material

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Wen Zhao,
  • Xin Wang,
  • Qian Bai,
  • Dazeng Sun,
  • Wenxin Cao,
  • Jialong Li

摘要

With the widespread adoption of Earth Pressure Balance (EPB) shield tunneling technology, urban subway construction generates a substantial amount of waste muck, necessitating efficient recycling and reuse technologies. This study focuses on the silty clay muck from the northern section of Shenyang Metro Line 6, and develops a bentonite-silty clay modified slurry (BSC) to achieve in-situ resource utilization of the muck. Through slump tests, a self-developed pressurized vane shear apparatus, and field trials, the effects of BSC on the workability, compressibility, and shear strength of sandy soil were systematically evaluated. The results indicate that, in comparison with bentonite slurry, BSC is an effective alternative for improving the workability, compressibility, and shear strength of conditioned sands. The pressurized shear test enables the establishment of a relationship between soil conditioning methods and the mechanical properties of conditioned soil, which is crucial for dynamically adjusting the conditioning schemes based on real-time tunneling data from EPB shield machines. Field tests reveal that the utilization of BSC leads to a 13.54% reduction in cutterhead torque and a 12.15% decrease in total thrust force. This study contributes to the development of sustainable and economical solutions for soil conditioning in urban tunnel projects, particularly by utilizing excavated materials effectively.