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冲击载荷下孔隙岩石能量耗散的实验研究 被引量:34

EXPERIMENTAL STUDY OF ENERGY DISSIPATION OF POROUS ROCK UNDER IMPACT LOADING
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摘要 利用分离式Hopkinson压杆装置(SHPB)进行了不同孔隙率人造岩石的冲击实验,分析了岩石冲击过程中能量耗散特性,探讨了孔隙率对岩石能量耗散的影响及岩石临界破坏时能量耗散情况。实验结果表明,冲击载荷作用下孔隙率对岩石能量耗散起着重要作用。在相同的冲击速度下,随着孔隙率的增加,岩石耗散的能量增加;岩石临界破坏所耗散的能量随着孔隙率的增加而减小。岩石能量耗散在一定程度上反映了岩石内部的损伤破坏情况。 Impact experiments of man-made rock with different porosities were carried out with Split Hopkinson Pressure Bar (SHPB). The characteristic of energy dissipation and the influence of rock porosity on energy dissipation were investigated during the impact process. Meanwhile, the relation between the energy dissipation of critical failure and rock porosity was also analyzed. The experimental results indicate that the porosity of rock plays an important role in the energy dissipation process. The energy dissipation increases as the porosity of man-made rock increases at the same impact velocity, and it decreases as the rock porosity increases under the critical damage of man-made rock. The energy dissipation is related to the internal damage of rock to some extent.
出处 《工程力学》 EI CSCD 北大核心 2006年第9期1-5,共5页 Engineering Mechanics
基金 国家973项目(2002CB412705) 国家自然科学基金创新群体项目(50221402) 国家自然科学基金项目(50174055)
关键词 冲击载荷 人造岩石 孔隙率 能量耗散 SHPB impact loading man-made rock porosity energy dissipation SHPB
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