Comparison of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting

Abstract

The measured data of vibrations induced by excavation of deep-buried cavern and open pit with method of bench blasting were analyzed by Fourier Transform and Wavelet Transform, and the characteristics of vibrations induced under these two circumstances were studied. It is concluded that with the similar rock condition and drilling-blasting parameters, vibration induced by bench blasting in deep-buried cavern has a higher main frequency and more scattered energy distribution than that in open pit. The vibration induced by bench blasting in open pit is mainly originated from the blast load, while the vibration induced by bench blasting in deep-buried cavern is the superposition of vibrations induced by blast load and transient release of in-situ stress. The vibration induced by transient release of in-situ stress increases with the stress level.

Keywords

deep-buried cavern / open pit / blasting vibration / power spectra / time-energy density / in-situ stress

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