Numerical simulation of dynamic water grouting using quick-setting slurry in rock fracture: the Sequential Diffusion and Solidification (SDS) method

The two-liquid mixing grouting method of quick-setting slurry and its time-dependent viscosity characteristics lead to an uneven distribution of viscosity in the slurry diffusion zone. At present, there still lacks reasonable and effective slurry-water interaction analysis method to reveal the diffusion behavior of quick-setting slurry in dynamic water. Therefore, a Sequential Diffusion and Solidification (SDS) method was proposed in this study, taking the spatial-temporal evolution of slurry viscosity into account. In addition, the validity and necessity of the SDS method were verified. The maximum error between the calculation result and the test result was less than 15%. Based on the SDS method, the slurry diffusion process under different flow velocities was analyzed and the effects of flow velocities on the changes of the grouting pressure, the counter-flow diffusion distance, and the down-flow diffusion behavior were explored. The applicability and the feasibility of studying the slurry diffusion mechanism in a wide fracture on an engineering scale were determined. This further confirmed the adequacy and the power of the numerical approach. Therefore, the SDS method could be used to simulate the dynamic water grouting. The SDS method could also provide an improved method for the simulation of permeation grouting and compaction grouting.