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应用SHPB试验装置研究预制单节理岩石的能量耗散关系。使用SHPB试验系统,对高径比为0.5的完整花岗岩试样及预制单节理花岗岩试样进行高应变率下的冲击劈裂试验。在相同驱动气压下,改变加载方向与节理间的夹角,完成高应变率相同入射能下的冲击劈裂试验。对SHPB系统中的入射能、反射能、透射能及试样吸收能的时程变化规律进行了分析;从能量角度出发,分析冲击荷载作用下单节理岩石的能量耗散规律及其各向异性特征。结果表明:高应变率下,完整花岗岩试样在冲击劈裂试验中的吸收能随平均应变率增加而增加,表现出显著的应变率相关性;预制单节理岩石与加载方向之间夹角对破坏模式的影响明显,节理试样产生3种破坏模式:(1)穿越节理面的劈裂破坏;(2)沿节理岩石层面的滑移破坏;(3)劈裂与滑移破坏共同作用下的破坏。在入射能基本相同,入射时间较长时节理岩石试样吸收能较入射时间较短时的吸收能大。动态劈裂试验中,节理试样的吸收能随节理角度变化(0°~90°)近似呈U型。研究成果可为节理岩石动态力学性能研究提供参考。
Study on Energy Dissipation Relationship of Precast Monolithic Rocks with SHPB Test Equipment. Using the SHPB test system, the impact fracture test under high strain rate was carried out on the intact granite specimen with high aspect ratio of 0.5 and prefabricated monolithic granite specimen. Under the same driving pressure, the angle between the loading direction and the joint is changed to complete the impact splitting test under the same incident energy with high strain rate. The variation of incident energy, reflection energy, transmission energy and absorbed energy of SHPB system were analyzed. From energy point of view, the energy dissipation law and anisotropy of single jointed rock subjected to impact load feature. The results show that under high strain rate, the absorption of intact granite samples in the impact splitting test increases with the increasing of the average strain rate, showing a significant strain rate dependence. The angle between the preformed single jointed rock and the loading direction The effect of failure mode is obvious. There are three kinds of failure modes in the joint specimen: (1) splitting failure through the joint plane; (2) slip failure along the joint rock plane; (3) joint action of splitting and slipping failure The destruction. When the incident energy is basically the same and the incident time is longer, the absorption energy of the rock specimen in the joint can be larger than that in the incident time. In the dynamic splitting test, the absorbed energy of the joint specimen changes approximately U-shaped with the change of joint angle (0 ° ~ 90 °). The research results can provide reference for the study of dynamic mechanical properties of jointed rock.