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The time-dependent equation of the silica sol solution was established. The difference in the grouting diffusion law between silica sol grout and cement-sodium silicate grout (C-S grout) is compared and analyzed by a stepwise calculation method under two grouting modes (constant-pressure grouting and constant-rate grouting). The results show that under the condition of constant-pressure grouting, the silica sol grout migrates and diffuses continuously for a long time, while the C-S grout is close to the final diffusion form at 15-20 s, a
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