Scholarlink

<p>Foam is extensively used to condition excavated sand for improving shield tunnelling efficiency and safety. Nevertheless, conventional foam often fails to achieve ideal conditioning effectiveness in water-rich environments. In this investigation, a novel viscosified foam specifically designed for water-rich sandy shield muck is developed via systematic compounding experiments. Furthermore, laboratory soil conditioning tests and field application are conducted to highlight the advantages of the viscosified foam. The obtained results show that the sodium dodecyl sulfate (SDS)/alkylamine oxide (OA-14) composite system exhibits remarkable thickening efficacy, which can enhance foam performance. The optimal compound mass ratio in the viscosified foaming agent is 2:1, and the recommended surfactant solution concentration is 3‰. The half-life of viscosified foam reaches 164.5&#xa0;min, which is approximately 39 times that of conventional foam. Compared with conventional foam conditioning, the rheological state of the viscosified foam-conditioned sand is significantly improved, and its hydraulic conductivity exhibits two orders of magnitude reduction. Moreover, the average cutterhead torque decreases by 31.2% when viscosified foam conditioning is used, whereas the average soil chamber pressure increases by 12.4%. The issues of water spewing and muck plugging in the Shenzhen-Huizhou intercity railway are effectively resolved under viscosified foam conditioning.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Development and Application of Novel Viscosified Foam for Conditioning Water-rich Sandy Muck in Shield tunnelling

  • 期刊论文

  • 发表日期：

    2026年8月3日

查看全文
  • Zhiyao Feng,
  • Zhiyuan Xiong,
  • Ji Zhao

摘要

Foam is extensively used to condition excavated sand for improving shield tunnelling efficiency and safety. Nevertheless, conventional foam often fails to achieve ideal conditioning effectiveness in water-rich environments. In this investigation, a novel viscosified foam specifically designed for water-rich sandy shield muck is developed via systematic compounding experiments. Furthermore, laboratory soil conditioning tests and field application are conducted to highlight the advantages of the viscosified foam. The obtained results show that the sodium dodecyl sulfate (SDS)/alkylamine oxide (OA-14) composite system exhibits remarkable thickening efficacy, which can enhance foam performance. The optimal compound mass ratio in the viscosified foaming agent is 2:1, and the recommended surfactant solution concentration is 3‰. The half-life of viscosified foam reaches 164.5 min, which is approximately 39 times that of conventional foam. Compared with conventional foam conditioning, the rheological state of the viscosified foam-conditioned sand is significantly improved, and its hydraulic conductivity exhibits two orders of magnitude reduction. Moreover, the average cutterhead torque decreases by 31.2% when viscosified foam conditioning is used, whereas the average soil chamber pressure increases by 12.4%. The issues of water spewing and muck plugging in the Shenzhen-Huizhou intercity railway are effectively resolved under viscosified foam conditioning.