【摘要】 为研究循环载荷下伟晶辉长岩的损伤规律与破坏模式，利用霍普金森压杆系统(SHPB)和PFC3D数值模拟软件对伟晶辉长岩展开了不同冲击速度的循环冲击试验，分析其损伤特性及破坏规律。结果表明：低冲击速度下，岩石试件的原生裂隙先被压密后随着循环次数增加试件逐渐发生破坏，岩石试件的峰值应力先增加后逐渐减小；随循环次数增加岩石反射能占比和耗能密度总体呈上升趋势，透射能占比总体呈下降趋势；岩石试件的损伤变量先出现负增长后平稳增长，试件发生宏观破坏前损伤变量急速增长；高冲击速度下，每次循环岩石试件均会发生破坏，试件的峰值应力随循环次数增加而增加，试件的损伤变量也随循环次数增加而增长；通过PFC3D模拟了试样在循环载荷下的破坏过程，发现岩石试件在循环载荷下总是沿着纵向面发生破坏。更多还原

【Abstract】 In order to study the damage law and failure mode of pegmatite gabbro under cyclic loading, the Split Hopkinson Pressure Bar(SHPB) and PFC3D numerical simulation software were used to carry out cyclic impact tests of pegmatite gabbro at different impact velocities, and the damage characteristics and failure law were analyzed. The results show that: Under low impact velocity, the original cracks of the rock specimen are first compacted and then gradually destroyed with the increase of the number of cycles, and the dynamic compressive strength of the rock specimen increases first and then decreases gradually. With the increase of the number of cycles, the proportion of rock reflection energy and energy consumption density generally show an upward trend, and the proportion of transmission energy generally shows a downward trend. The damage variable of the rock specimen first shows a negative growth and then a steady growth, and the damage variable of the specimen increases rapidly before the macroscopic failure occurs. Under high impact velocity, the rock specimen will be destroyed in each cycle, the dynamic compressive strength of the specimen increases with the increase of the number of cycles, and the damage variable of the specimen also increases with the increase of the number of cycles. The failure process of the specimen under cyclic loading was simulated by PFC3D, and it was found that the rock specimen was always destroyed along the longitudinal plane under cyclic loading.更多还原