Abstract: In grouting treatment and seepage prevention, diffusion of grouts plays an important role, involving solid skeleton’s stress-strain relation, seepage field distribution and grout concentration’s distribution gradient perpendicular to the diffusing direction. According to coupling of seepage field and stress field in porous media, we take into consideration the time-varying viscous characteristics of grouting parameters, and dynamic variation of physical parameters of grouting in porous media, namely density, porosity, and permeability. On the basis of this, we analyze the correlation and dynamic change of physical parameters and present a simulation method for grouting diffusion. In the simulation of homogeneous soil under fluid-solid coupling, we use finite element method to obtain spherical diffusion radius and cylindrical diffusion radius under the conditions of time-varying viscosity and unchanged viscosity. Compared with conventional theory of grouting diffusion, fluid-solid coupling simulation taking soil parameters and dynamic characteristics of slurry into account is very suitable for analyzing diffusion range of slurry in soil.

Key words: porous media, grouting, diffusion range, fluid-solid coupling, dynamic parameter