Analysis of sand grouting diffusion mechanism based on infiltration effect
The retention and deposition of cement particles on the sand pore channel under the percolation effect seriously affects the grouting improvement at the far end of the diffusion.Based on the two-phase flow theory,the dynamic process of percolation effect is analyzed,and the differential control equation of slurry diffusion is estab-lished considering the mass conservation and continuity of seepage.Then the numerical simulation of one-dimen-sional planar seepage problem is carried out.The results show that the percolation effect has a significant impact on the porosity,slurry pressure,flow velocity and concentration of sand.The maximum difference between the nu-merical calculation results and Darcy's law is about 40％.The basic characteristics of percolation effect and its in-fluence mechanism on sand grouting reinforcement effect are revealed,and it is pointed out that the cement content of grout diffused to the far end under percolation effect is small,which cannot produce ideal reinforcement effect.The conclusions can be used as reference for the design and construction of sand grouting works,and also have cer-tain guiding significance for the development of porous media seepage mechanics.
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