关键词: 爆破, 振动, 爆源因素, 频谱特性, 动力有限元

Abstract: This research is conducted in the aim of better controlling the impact of blasting vibration. The spectral expression of triangle blast load and the spectral solution of vibrations induced by the blast sources of sphere charge and cylinder charge are derived through theoretical analysis. The regularity of main frequency attenuation of vibration induced by single hole blast is investigated by the dynamic finite element method based on the equivalent simulation of blast load. On this basis, the influence of blast source parameters on spectral characteristics of vibration induced by blast of rock mass is discussed. The results indicate that the spectral composition and main frequency attenuation law of blasting vibration are dependent on the parameters of the blast source. The time of blast load buile-up mainly affects the spectral range, while factors such as the time of blast load reduction, the charge weight and the charge structure mainly affect the high and low frequency proportions and the frequency attenuation rate of blasting vibrations.

Key words: blast, vibration, blast source parameters, spectral characteristics, dynamic finite element method