Based on the theory of particle flow

the process of grouting in weak strata is mesomechanically simulated; and the influence of grouting pressure

grouting time

permeability coefficient and particle bond strength on grouting diffusion radius and grouting type is concerned. By using FISH language embedded in the Particle Flow Code in 2 Dimensions(DFC2D)

a function that can extract the pressure value of fluid domain at specific position is established; and the diffusion distribution of grouts is studied. Considering time-dependent behavior of the grouts and nonuniformity of the stratum

the effective grouting radius is defined to modify these factors. The simulated results are consistent with Maag’s formula. The mesomechanical simulation of grouting has been conducted with a practical engineering example. Based on the results of mesomechanical simulation

a scientific grouting scheme is proposed. And the application to site has achieved good sealing and strengthening effect.