Abstract: In this paper, we prepared samples of grouting-reinforced fractured mudstone with different grouting contents and moisture conditions by simplifying the simulation of grouting process. Dynamic characteristics of grouting-reinforced fractured mudstone sampled were investigated by a split Hopkinson pressure bar (SHPB). Furthermore, the experimental process of SHPB test was simulated by using finite element software Ansys/LS-Dyna, and numerical results were analyzed and compared with experimental data. The results show that dynamic properties of samples were significantly influenced the grouting content. The best grouting effect was achieved when the degree of mudstone crushing was moderate and the slurry had a good pressure condition. In addition, the water content obviously affected the dynamic behaviors of samples with the same grouting content. In general, the higher water content resulted in smaller peak strength and elastic modulus. The stress-strain curve by numerical simulation was in good agreement with experimental one. The rationality analysis of the HJC model parameters shows that there is a strong correlation between the model parameters (A and B) and dynamic peak stress, and their values increase with the increase of strength.

Key words: SHPB test, dynamic behavior, mudstone, grouting-reinforced body, numerical simulation, HJC model