Theoretical and experimental research on the grout fronts diffusion considering filtration effect
2017
Based on the seepage continuity equation, Darcy law, mass conservation
equation, linear filtering law and pressure drop equation, the theoretical
model of grout fronts diffusion was established. And through the model,
the filtration mechanism of cement particles and the diffusion law
of slurry fronts were analyzed. By applying the model test system
developed independent, the dynamic variation law of the pressure of
grout fronts is studied and compared with the theoretical value. The
results show that, the permeability coefficient of the precipitated
cement increases along the grout diffusion distance under the filtration
effect. The change rate of frontal velocity is negatively correlated
with the permeability coefficient of precipitated cement. At the specific
diffusion distance, the frontal pressure drop p
increases first and then decreases, while the frontal pressure p and the average unit pressure drop Δ P show the trend of decreasing first and then increasing. The
deviation rate of frontal pressure value between theory and test is
only from –10% to 26%, which reveal a high degree of coincidence.
The conclusions can be used to guide the grouting design, which has
certain application value to the practical engineering.
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