【摘要】 岩石RHT模型参数的确定对于简化材料参数计算及提高模拟精度具有重要意义。为准确获得花岗岩RHT模型参数■取值，本工作在证明借助LS-DYNA软件和采用RHT模型对SHPB冲击试验进行模拟为有效研究方法后，利用该方法设计正交模拟试验。以峰值应力为评价指标，通过多重共线性分析，证明参数■无交互作用。进而逐一改变以上6个参数取值，利用LS-DYNA软件模拟SHPB冲击试验，分析其取值变化对岩石破坏方式和形态以及应力-应变曲线等模拟结果的影响，并采用单因素变量法对相关参数进行敏感性定量分析。研究结果表明，峰值应力和应变率的偏移率小于3%，敏感度不大于0.21，参数■的取值变化对模拟结果影响较小。本工作还通过对比模拟侵彻深度与已发表文献中侵彻试验结果的误差，得到了花岗岩RHT模型参数■的最佳取值。更多还原

【Abstract】 The determination of rock RHT model parameters is of great significance for simplifying the calculation of material parameters and improving the simulation accuracy. In order to accurately obtain the values of RHT model parameters ■of granite, after proving that the simulation method by employing LS-DYNA software and using RHT model is effective for investigating SHPB impact test,orthogonal simulation test was designed by this method. Taking peak stress as evaluation index, through multicollinearity analysis, it was proved that parameters of ■have no interaction with each other. Then the values of the aforementioned six parameters were changed separately one by one, and the SHPB impact test was simulated via LS-DYNA software. The influences of the values’ changes on the simulation results of rock failure mode and shape, stress-strain curve, etc. were analyzed, and the quantitative sensitivity analysis of the relevant parameters was carried out by single factor variable method. The results showed that the offset rates of the simulated values of peak stress and strain rate were less than 3%, and the sensitivities were equal to or less than 0.21. The changes in parameters of ■has little effects on the simulation results. By comparing the difference between the simulated penetration depth and the results of projectile penetration tests reported in available publications, the optimal tuning for values of parameters ■for granite RHT model was obtained.更多还原