| 爆破振动主频衰减公式研究 |
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| 作者单位： | ;1.武汉大学水资源与水电工程科学国家重点实验室;2.武汉大学水工岩石力学教育部重点实验室 |
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| 摘 要： | 从无限弹性岩体中球形空腔受动内压作用激发弹性波的解析解出发,结合爆破振动频率衰减规律的量纲分析,推导出球形药包激发爆破振动主频的衰减公式。在此基础上,利用钻孔爆破中装药量与直径的关系,结合岩体破碎范围、台阶高度和抵抗线间关系等的讨论,论证了基于球形药包推导的爆破振动频率衰减公式适用钻孔爆破的可行性。结合球形药包爆破振动模拟和某次单孔爆破振动主频实测资料的拟合分析,验证了建议频率衰减公式的有效性。
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| 关 键 词： | 钻孔爆破 爆破振动 主频 衰减规律 |
STUDY ON ATTENUATION FORMULA OF DOMINANT FREQUENCY OF BLASTING VIBRATION |
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| Affiliation: | ,State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University |
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| Abstract: | For blasting vibration induced by a spherical charge,an attenuation formula of dominant frequency was proposed based on the theoretical solution of elastic-wave propagation emitted by loads acting on a spherical chamber in the infinite elastic rockmass.In the derivation,dimensional analysis was employed for attenuation laws of vibration frequencies.Then for drill and blast,the relationship between the charge weight and the hole diameter was discussed and analyzed as well as the rock fracture zone,bench height and burden.After that,the formula of spherical charge was verified to be also applicable to drill and blast.Finally,the attenuation formula of dominant frequency proposed was validated by numerical simulation and empirical data from an in-situ drill and blast experiment. |
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| Keywords: | Drill and blast Blasting vibration Dominant frequency Attenuation law |
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