Grouting diffusion range is the key to evaluate the grouting effect. In this study, a theoretical model of noncohesive sediment erosion damage was established, and the main parameters affecting erosion were qualitatively analyzed. Secondly, based on the computational fluid dynamics (CFD)–discrete element method (DEM) coupling method, the effect of grouting pressure and nozzle diameter on the diffusion mechanism of slurry was studied. The findings reveal a distinct evolution in the grouting process. Initially, during the early stages of grouting, the scour hole expands, accompanied by pronounced horizontal crack development. As grouting progresses, more vertical cracks emerge, indicative of a transition from jet grouting to fracture grouting. Notably, the cross-sectional shape of the grouting area resembles a “bell-shaped,” while horizontally it appears round or oval. The axial diffusion depth increases with the increase of injection pressure and increases first and then decreases with the increase of nozzle diameter. Notably, the optimal process parameters can be achieved when either the injection pressure or nozzle diameter is held constant. Under specific simulation conditions, such as a grouting pressure of 20 MPa, the optimal nozzle diameter is determined to be 2.5 mm. These findings offer valuable insights for enhance our understanding of the grouting mechanism.
Loading....