Analysis of Slope Blasting Vibration Signals Based on EEMD-HHT
The blasting engineering environment is generally complex and variable,and the blasting vibration signals mostly exhibit instantaneous non-stationary characteristics.In order to accurately analyze the signal characteristics and propagation laws of blasting vibration,the roadbed blasting project of the Chengping section of the Ring Ex-pressway in Beijing was taken as an example.The shortcomings of modal mixing in traditional EMD decomposition methods is solved by introducing the EEMD decomposition method;Combining with HHT transformation,the blast-ing vibration signals of typical cutting slopes was analyzed in Chengping section.The research results indicate that the main IMF energy layers was extracted from blasting vibration signals and the vibration signals was reconstructed by the EEMD method,which can achieve good denoising effects;After the analysis and extraction of principal com-ponent of the blasting vibration signals at the construction site,the overall smoothness of the instantaneous energy and particle velocity curves was significantly improved,and the extraction effect of signal principal component was good;The Hilbert energy spectrum can clearly reflect the relationship among time,frequency,and energy to demonstrate the time-frequency characteristics and propagation laws of blasting vibration signals;The main fre-quency of vibration at measuring points was mainly distributed in the frequency range of 10～40 Hz,showing an ap-proximate trend of attenuation with increasing propagation distance,and the attenuation amplitude becomes weaker with increase of distance.It has important practical significance for the stability analysis of road cutting slopes and the safety control of adjacent buildings.
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