The Riedel-Hiermaier-Thoma (RHT) model is extensively used in the numerical simulation and analysis of phenomena such as explosive impacts and penetration. The accuracy of the simulation results is primarily dependent on the constitutive model and the parameter values used within it. To perform sensitivity analysis and parameter determination for Lode angle correlation coefficient, the tensile yield surface parameter, the reference compressive strain rate, the reference tensile strain rate, the failure compressive strain rate and the failure tensile strain rate in the RHT model for various rock types, LS-DYNA was employed to simulate the projectile penetration into a target and split Hopkinson pressure bar (SHPB) impact tests under single-factor variations. The effects of changes in parameter values on the simulation results were analyzed, followed by an orthogonal test to assess the interaction effects between parameters and determine the optimal parameter values. The results indicate that the sensitivity ranking of the six parameters varies under different operational conditions, and the effects of these parameters on the elastic, linear strengthening, and damage-softening stages of the SHPB impact stress-strain curve were identified. Further orthogonal SHPB impact simulation tests confirm the absence of interaction between these parameters, validating that the single-factor sensitivity analysis results are effective. The optimal values for these parameters in the RHT models of granite, red sandstone, and marble are determined. This finding provides valuable insights for the sensitivity analysis and parameter determination in rock-type RHT models.

Aiming at the problem of determining the parameters of the corner-column cutting hole network, according to the previous research, the calculation model of the radius of the crushing zone R_p and the radius of the fracture zone R_f under the action of rock blasting is summarized and deduced, the effects of blast stress waves and blast gases on rock fragmentation are quantified, and according to the results of R_p and R_f combined with the effect of distending space, the calculation model of the parameters of the cut hole mesh was constructed. Combined with the actual calculation example on site, The radius of the crushing zone caused by the explosion stress wave is R₁ = 50 mm, the radius of the crack zone is R₂ = 550 mm, the radius of the crushing zone caused by the secondary crushing of the explosive gas is l_c = 16 mm, and the radius of the crack zone is l_g = 420 mm. Since the holes should be located in R_p = 66 mm, R_f = 970 mm combination with the space effect of crushing expansion, the distance between the charging hole L and the empty hole and the distance between the charging holes L₁ must satisfy 66 mm＜L＜L₁＜160 mm. Combined with the actual on-site L = 0. 1 m, L₁ = 0. 15 m. A numerical model is established for the cutting scheme to calculate, the simulation results show that the average crack length in the fissure zone is 1069. 4 mm, compared with R_f = 970 mm, the error is 99. 7 mm, the average length of the crushed cavity in the crushing area is 67. 1 mm, and the error is only 1. 1 mm compared with R_p = 66 mm. The cutting scheme has been carried out for many times on-site roadway excavation experiments. The test results show that the utilization rate of the blasthole can be increased from the original 80% to more than 93%, which verifies the validity of the model.