Experimental study on visualization of seepage flow and grout diffusion and seepage reduction patterns in rough single fissure

Abstract The study of fissure seepage and grouting diffusion, seepage reduction law is of great significance for the prevention and control of water damage in fissured rock bodies. To this end, a visualization test model based on the morphology of real rock fissures was prepared in bulk using 3D scanning and 3D printing technology, and tests were carried out to realize the visualization of seepage flow in a single fissure, grouting with different water-cement ratios, and seepage flow after the fissure grouting was consolidated and filled. The test results show that: compared with grouting diffusion, the seepage of water injection into the fissure is different in activity and coverage; the rough single fissure seepage shows nonlinear flow characteristics, and is a composite flow form of laminar and turbulent flow; the grouting into the fissure has the effect of climbing and swooping, and the diffusion rate and filling rate of the grout are obviously different under different water-cement ratio conditions; after the grout is filled and consolidated in the fissure, the permeability coefficient of the fissure is greatly reduced, and the seepage performance is significantly different. After the slurry is filled and consolidated in the fissure, the permeability coefficient is greatly reduced, and the seepage flow is nonlinear, which conforms to the Forchheimer's equation, and with the decrease of the water-cement ratio of the cement slurry, the coefficient of the linear term decreases, and the coefficient of the nonlinear term increases and accounts for a larger proportion in the binomial.