期刊文献+

节理倾角对深部凝灰岩动力学特性与能量传递的影响

Effect of Joint Inclination Angle on Dynamic Properties and Energy Transfer of Deep Tuff
下载PDF
导出
摘要 为探究含节理深部凝灰岩在一维动载作用下的力学特性和能量传递规律,采用SHPB试验装置对7种指定天然节理倾角的凝灰岩试件进行冲击试验;试验过程中通过高速摄影仪对动态过程实时记录。从动态强度、能量耗散和宏观破坏等方面系统地分析节理倾角对深部凝灰岩动态响应特征的影响规律,结果表明:凝灰岩在节理倾角为45°时,动强度最小,动态抗压强度和峰值应变在节理倾角从0°增加到90°的范围内呈现出先降低到后上升的趋势。试件的最终破坏模式受节理倾角的控制,不同节理倾角的凝灰岩试件的最终破坏模式可分为拉伸破坏、拉伸–剪切复合型破坏、剪切破坏。在入射能量大致相同的情况下,凝灰岩的反射能比与透射能比随着天然节理倾角的增加呈现先下降后上升的趋势,在45°时最低,耗散能比则相反。能时密度随节理倾角的增大为先增大后减小,荷载作用方向与节理在45°~60°时吸收的能量较多并用于自身裂纹扩展。 In order to investigate the mechanical properties and energy transfer law of jointed deep tuff under one-dimensional dynamic loading,seven kinds of tuff specimens with specified natural joint inclinations were tested by SHPB test device.During the tests,the dynamic process was recorded by high-speed camera in real time.The influence of joint inclination angle on the dynamic response characteristics of deep tuffs was systematically analyzed in terms of dynamic strength,energy dissipation and macroscopic damage.The results show that tuffs has the lowest dynamic strength when the joint inclination is 45°,and the dynamic compressive strength and peak strain show a tendency of decreasing firstly and then increasing in the range of joint inclination angle increasing from 0°to 90°.Besides,the final damage modes of the specimens are controlled by the nodal inclination,and the final damage modes of tuff specimens with different nodal inclinations can be classified into tensile damage,tensile-shear composite damage and shear damage.When the incident energy is roughly the same,the reflection energy ratio and transmission energy ratio of tuff present a decrease-increase trend with the increase of natural joint inclination angle,with the lowest energy ratio at 45°.However,the trend of the dissipation energy ratio is opposite.The energy-time density increased first and then decreased with the increase of joint inclination angle.When the direction of load and joint is within 45°~60°,more energy is absorbed and used for self-crack propagation.
作者 田栩帆 李祥龙 黄原明 赵艳伟 胡正祥 TIAN Xu-fan;LI Xiang-long;HUANG Yuan-ming;ZHAO Yan-wei;HU Zheng-xiang(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yuxi Mining Co.,Ltd,Yuxi 653100,China)
出处 《爆破》 CSCD 北大核心 2024年第3期43-50,共8页 Blasting
基金 国家自然科学基金资助项目(52274083)。
关键词 SHPB试验 深部凝灰岩 天然节理 能量耗散 动力学特性 节理倾角 HSPB test deep tuff natural joints energy dissipation dynamical characteristics joints inclination
  • 相关文献

参考文献9

二级参考文献115

共引文献137

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部