Abstract: Rockmass grouting reinforcement, a complex process affected by various factors, can not only improve the overall stability of fractured rockmass but also reduce the rockmass permeability so as to prevent underground water inrush. Four kinds of cement concrete specimen were designed, including the single oblique joint, a group of cross-oblique joints, a group of parallel joints and double oblique cross (parallel）joints, and the influencing factors of fractured rockmass were studied through model test and numerical simulation. The results indicate that the effects of grouting reinforcement of fractured rockmass are related to the fracture distribution, connectivity rates and fragmentation degree of rockmass.

Key words: Fractured rockmass, Grouting reinforcement, Model test, Numerical simulation, Influencing factors