Pulsating grouting has been widely used in seepage prevention and reinforcement grouting and engineering

but the mechanism of infiltration grouting is not clear

which impairs theory development and current theory could not guide engineering practice. Based on the Bingham fluid rheological equation

the seepage equation

and the particle deposition theory

the infiltration grouting theory of Bingham fluid under pulsating pressure is deduced. Also

the effect of pulsating grouting parameters on slurry diffusion range is analyzed

and it is verified by the self-made indoor experimental device. The results show that there is an error between the calculated value based on the theory and the value measured in the test

but it can meet engineering requirements and can be used to guide project construction. The slurry diffusion range increases with the increase of grouting time and the initial porosity of the formation

and the slurry diffusion range decreases with the increase of grouting interval time and the decrease of the initial porosity of the formation. Therefore

it is necessary to adjust pulsation grouting parameters according to initial porosity of the formation to ensure the effective slurry diffusion range in grouting engineering. The research results can provide references for the study of theory and guidance for practical construction.