In order to investigate the permeability of different highly permeable grouting materials,three materials,namely ultra-fine cement,urea formaldehyde resin,and silica sol,were taken as the research objects.Indoor grouting tests were designed for non-pressurized river sand media and pressurized clay media.Based on the geometric shape of the consolidated body and the degree of fracture development in the two media after grouting,the strength of the intra-pore permeability and diffusion mechanism of the three materials were analyzed.The results showed that,among the three materials,silica sol had the strongest intra-pore permeability,followed by urea formaldehyde resin,and ultra-fine cement had the weakest permeability.As the permeability of the medium decreased,its diffusion mode changed from intra-pore seepage to fracture pipeline flow,and the weaker the permeability of the slurry,the faster this process changed.
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