孔底设复合消能结构的岩体爆破振动特性研究

发布时间：2018-04-19 21:44

本文选题：复合消能结构 + 数值模拟　；参考：《爆破》2017年04期

【摘要】：爆破振动的特性、控制方法及措施一直是工程爆破界的研究热点。基于白鹤滩水电站坝基开挖中开展的孔底设复合消能的岩体爆破开挖试验,结合动力有限元技术数值模拟,以及对实测振动傅里叶频谱分析,研究了孔底设复合消能结构的岩体爆破振动特性。数值模拟与现场监测结果表明:孔底设复合消能结构相对于常规装药结构能够大幅减小炮孔底部岩体的爆破振动速度,减小幅度达到30%以上,相应的傅里叶幅值谱峰值和主频率也有降低,可见爆破孔孔底设复合消能结构可有效降低孔底的峰值振动速度,从而控制孔底岩体的爆破损伤范围。
[Abstract]:The characteristics, control methods and measures of blasting vibration have always been a hot topic in engineering blasting field. Based on the excavation test of rock mass blasting with composite energy dissipation at the bottom of the hole in the excavation of the dam foundation of Baihetan Hydropower Station, combined with the numerical simulation of the dynamic finite element technique and the analysis of the Fourier spectrum of the measured vibration, The vibration characteristics of rock mass blasting with composite energy dissipation structure at the bottom of the hole are studied. The numerical simulation and field monitoring results show that the blasting vibration velocity of the rock mass at the bottom of the hole can be greatly reduced by more than 30% compared with the conventional charging structure of the composite energy dissipation structure at the bottom of the hole. The corresponding peak value of Fourier amplitude spectrum and the main frequency are also reduced. It can be seen that the composite energy dissipation structure can effectively reduce the peak vibration velocity of the hole bottom and thus control the blasting damage range of the rock mass under the hole bottom.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金面上项目(No.51279146、No.51479147)
【分类号】：TV223

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