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

来源期刊:中南大学学报(英文版)2011年第5期

论文作者:卢文波 李鹏 陈明 周创兵 舒大强

文章页码:1709 - 1718

Key words:deep-buried cavern; open pit; blasting vibration; power spectra; time-energy density; in-situ stress

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.

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