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<p>The multi-process interaction between slurry and soil commonly occurs during slurry grouting in stiff clay, dense sand, and sandy clay. This interaction involves several physical mechanisms, including slurry particle penetration, slurry bubble expansion, and soil splitting. In this study, a new hydro-mechanical coupled sequential multi-stage framework is proposed to simulate the slurry grouting process in saturated soils. Governing equations are developed to describe filter-cake formation (resulting from slurry penetration and particle deposition), slurry bubble expansion within the pressure filtration zone, and the multi-stage initiation and propagation of fractures in the surrounding soil. Analytical solutions are subsequently derived and validated, providing a theoretical basis for the design of engineering grouting projects. The results indicate that at the initial stage of grouting, a filter cake forms rapidly at the flow inlet as slurry particles deposit and fill the soil pore spaces. During slurry bubble expansion, pore pressure within the pressure filtration zone progressively transfers to effective stress, leading to nonlinear decreases in radial displacement and stress in the surrounding soil with increasing distance from the grouting hole. Once soil splitting initiates, fractures propagate until the cumulative released elastic strain energy equals the cumulative increase in fracture surface energy.</p>

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Hydro-mechanical coupled sequential multi-stage modeling of slurry–soil interaction during grouting in saturated soils

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Qiyu Yao,
  • Shunhua Zhou,
  • Peijun Guo,
  • Chao He

摘要

The multi-process interaction between slurry and soil commonly occurs during slurry grouting in stiff clay, dense sand, and sandy clay. This interaction involves several physical mechanisms, including slurry particle penetration, slurry bubble expansion, and soil splitting. In this study, a new hydro-mechanical coupled sequential multi-stage framework is proposed to simulate the slurry grouting process in saturated soils. Governing equations are developed to describe filter-cake formation (resulting from slurry penetration and particle deposition), slurry bubble expansion within the pressure filtration zone, and the multi-stage initiation and propagation of fractures in the surrounding soil. Analytical solutions are subsequently derived and validated, providing a theoretical basis for the design of engineering grouting projects. The results indicate that at the initial stage of grouting, a filter cake forms rapidly at the flow inlet as slurry particles deposit and fill the soil pore spaces. During slurry bubble expansion, pore pressure within the pressure filtration zone progressively transfers to effective stress, leading to nonlinear decreases in radial displacement and stress in the surrounding soil with increasing distance from the grouting hole. Once soil splitting initiates, fractures propagate until the cumulative released elastic strain energy equals the cumulative increase in fracture surface energy.