Abstract: Post-grouting technique is an important means of improving the bearing capacity of pile foundation. According to the field physical parameters of soil layers at a project, an inhomogeneous formation model is constructed via Diamond-Square algorithm based on the random fractal theory. In consideration of changes in soil porosity, permeability and other parameters during grouting around pile foundation, the grouting process is simulated in association with the equation of fluid motion. Through analyzing the real-time dynamic changes of physical parameters of soil layers, the irregular distribution of slurry dispersion and stone body are obtained. The mechanical properties of soil and stone around the pile has improved significantly after grouting, indicating an obvious reinforcement effect. Numerical simulation of grouting based on inhomogeneous formation model could be used to guiding and evaluating the reinforcement process of pile grouting.

Key words: pile foundation, grouting, random fractal theory, inhomogeneous formation, reinforcement