为研究冲击荷载下早龄期喷射混凝土动力学响应及损伤特征，基于霍普金森压杆对早龄期喷射混凝土开展不同冲击速度下动态压缩试验，分析其动力学特征；采用DIC技术分析其冲击过程中位移场变化及能量演化特征。研究表明：随应变率增加，早龄期喷射混凝土峰值应力、峰值应变和动态弹性模量随之增加，且不同龄期喷射混凝土存在差异；冲击扰动下早龄期喷射混凝土裂纹发育错综复杂，劣化区域破碎，位移场从连续向不连续发展，且不同龄期喷射混凝土能量演化特征呈现明显变化。研究成果揭示了早龄期喷射混凝土在冲击荷载下的损伤特征，具有重要的理论意义和工程推广应用前景。
Abstract
In order to study the dynamic response and damage characteristics of early-age shotcrete under impact load，the dynamic compression test of early-age shotcrete under different impact velocities was carried out based on the Hopkinson pressure bar，and the dynamic characteristics were analyzed，and the displacement field change and energy evolution characteristics during the impact process were analyzed by DIC technology. The results show that with the increase of strain rate，the peak stress，peak strain and dynamic elastic modulus of shotcrete in the early age increase accordingly，and there are differences in the shotcrete at different ages. The research results reveal the damage characteristics of shotcrete under impact load at an early age，which has important theoretical significance and engineering application prospects.
关键词
早龄期 /
喷射混凝土 /
分离式霍普金森压杆冲击试验 /
数字图像相关法 /
损伤演化
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Key words
early age /
shotcrete /
split Hopkinson pressure bar（SHPB） impact test /
digital image correlation method /
damage evolution
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