Grouting Mechanism of Cement Slurry in Porous Media Based on Large‐Scale Model Test

The filtration effect of slurry particles in the grouting of dense porous media may lead to a big difference between the theory and engineering practice. To study the filtration effect and obtain a deeper understanding of grouting mechanism of cement slurry in porous media, a large‐scale laboratory model test was conducted in this study. The seepage pressure and earth pressure in the grouting process were monitored. The grouting diffusion of the slurry in the sand layer was observed and the distribution of the compressive strength in the horizontal plane was also obtained. The results showed the slurry preferentially diffused in the upper part of the sand layer, resulting in the conical actual slurry–water interface. In the incomplete diffusion region, the cement content was higher in the upper layer and the cement slurry content gradually decreased in the vertical direction. The data of seepage pressure and earth pressure nearest to the grouting hole show that the deep infiltration effect of cement slurry particles is more significant in the direction of outflow boundary. The compressive strength decreased with the increase in the distance away from the grouting point because of the deep infiltration effect of cement slurry particles. The study may provide a reliable reference for similar grouting projects.