By the grouting test in sandbox

the influence of seepage on grouting in sandy gravels is studied. First

the groutability of sandy gravels is verified on condition that the slurry is chosen as grouting material; and the relevant parameters

including water cement ratio

grouting time

grouting pressure and grouting depth are determined. Second

in the absence of seepage

the relationship between grouting pressure

water cement ratio and grout diffusion distance is studied. Finally

under seepage

the relationship between grouting pressure

hydraulic gradient and grout diffusion distance is studied by adjusting water head difference between the upstream and downstream. It is shown that there is no significant influence of seepage on the linear relationship between grouting pressure and grout diffusion distance; and that the relationship between hydraulic gradient and grout diffusion distance shows nonlinear behavior under the different grouting pressures