Abstract: 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.

Key words: pulse grouting, Bingham fluid, penetration diffusion, laboratory test