基于输入能量的爆破震动安全评价方法研究

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Abstract Structure damages caused by blasting vibration are not only related to the vibration intensity，but also related to vibration frequency，duration and other factors. The safety evaluation index based on independent threshold value may be inconsistent with the actual damage. Thus，it has important significance of establishing the safety evaluation index of blasting vibration from the energy viewpoint. The instantaneous energy analysis method based on Hilbert-Huang transform (HHT) is proposed. Firstly，intrinsic mode function(IMF) components of blasting vibration signals are extracted. Then，Hilbert transform for IMF is gotten to calculate the total input energy(TIE) of vibration signals. Finally，TIE is used as safety evaluation index of blasting vibration. TIE value not only can reflect the general laws of particle peak velocity(PPV) based on existing specification，but also can give a concise quantitative description for dominant frequency and duration factors. Combining the measured blasting vibration data of shallow-buried section in the Qiantangjiang diversion tunnel project，the feasibility of this method is verified. According to example calculation and blasting damage investigation，the blasting vibration will harm masonry structures when TIE is greater than 1.

Key words： blasting engineering blasting vibration safety evaluation index Hilbert-Huang transform energy

Received: 12 May 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I12/2492

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