Grouting is an effective method to seal against water inrush in fractured rock. It is important to study the mechanism of fissure grouting to design the grouting and implement the project successfully. In this paper

firstly

the influence of the rheological properties of the slurry

diffusion path and grouting methods on fracture grouting was analyzed deeply. An improved step-wise calculation method was proposed to describe the fissures grouting process under different grouting diffusion conditions. This method can calculate key grouting parameters

such as the slurry front position

injection pressure

slurry viscosity and pressure distribution in the grouted zone

and grouting rate at any time. Secondly

the improved method was utilized to study the constant-parameters such as constant pressure grouting and constant rate grouting during the grouting process. The reliability and applicability of the approach were verified by comparing with previous results in the literature. Finally

the approach was adopted to investigate the dynamic fracture grouting characterized by staged descending rate and staged increasing pressure in practical engineering conditions. The change laws of the key factors

such as the injection pressure

grouting rate and diffusion distance

were analyzed. Therefore

this study revealed the diffusion mechanism of the dynamic fracture grouting to some extent and provided a meaningful guide for grouting design in practice.