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<p>This research experimentally analysed grout flow behaviour through rough parallel multi-fractures (plate specimens made of organic glass) using a self-developed, stress-dependent grout flow experimental system. It was found that: (1) the relationship between the grout hydraulic gradient (<i>J</i>) and the volumetric flow rate (<i>Q</i>) conforms to Forchheimer's nonlinear flow law. The grout flow characteristics through rough multi-fractures are significantly affected by both the grout water–cement ratio (W/C) and the normal load (<i>F</i><sub>N</sub>). (2) Under a fixed <i>F</i><sub>N</sub>, with an increase in W/C, the critical grout hydraulic gradient (<i>J</i><sub>c</sub>) generally showed a downward trend, while the critical Reynolds number (<i>Re</i><sub>c</sub>) shows an upward trend. Under a fixed W/C, <i>Re</i><sub>c</sub> increases as <i>F</i><sub>N</sub> decreases.</p>

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Experimental Investigation of Grout Flow Behaviour Through Rough Parallel Multi-Fractures

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Yuhao Jin,
  • Lijun Han,
  • Shuo Yang,
  • Hui Guo,
  • Shanjie Su,
  • Lanying Huang,
  • Deyuan Zong,
  • Peitao Qiu,
  • Kun Hu

摘要

This research experimentally analysed grout flow behaviour through rough parallel multi-fractures (plate specimens made of organic glass) using a self-developed, stress-dependent grout flow experimental system. It was found that: (1) the relationship between the grout hydraulic gradient (J) and the volumetric flow rate (Q) conforms to Forchheimer's nonlinear flow law. The grout flow characteristics through rough multi-fractures are significantly affected by both the grout water–cement ratio (W/C) and the normal load (FN). (2) Under a fixed FN, with an increase in W/C, the critical grout hydraulic gradient (Jc) generally showed a downward trend, while the critical Reynolds number (Rec) shows an upward trend. Under a fixed W/C, Rec increases as FN decreases.