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采用改进后具有主动围压加载装置的100mm分离式Hopkinson压杆(SHPB)试验装置,研究了斜长角闪岩在不同围压等级(0MPa～6MPa)和不同应变率(50s 1～170s 1)下的冲击压缩力学性能。试验结果表明:在相同围压下,斜长角闪岩的动态抗压强度随应变率的增加而近似线性增加,动态增长因子与应变率的对数呈近似线性关系,体现了显著的应变率相关性;在同等级应变率范围内,随着围压的增加,岩石的增强效果逐渐增强,显现出较强的围压效应。采用组合建模的方法,将统计损伤模型和粘弹性模型相结合,建立了基于Weibull分布的动态损伤本构模型。验证发现,修正后的模型曲线和试验曲线吻合较好,表明所构建本构模型是合理的,可为进一步研究和工程应用提供一定的参考。
A 100mm split Hopkinson pressure bar (SHPB) test rig with an active confining pressure device was used to study the characteristics of amphibolite under different confining pressures (0MPa ~ 6MPa) and different strain rates (50s 1 ~ 170s 1) Under impact compression mechanical properties. The experimental results show that under the same confining pressure, the dynamic compressive strength of amphibolite increases linearly with the increase of strain rate, and the dynamic growth factor has an approximately linear relationship with the logarithm of strain rate, which shows a significant strain rate In the same strain rate range, with the increase of confining pressure, the enhancement effect of the rock gradually increases, showing a strong confining pressure effect. A combination of statistical damage model and viscoelastic model is used to establish a dynamic damage constitutive model based on Weibull distribution. It is found that the corrected model curve is in good agreement with the experimental curve, indicating that the constitutive model is reasonable and can be used as a reference for further research and engineering application.