Title: Mechanism analysis of fault-phase vibration reduction for tunnel blasting initiated by electronic detonators in city area
Abstract: Reducing vibration is a key problem for tunnel blasting in city area.Here,a time-frequency analysis was performed to analyze general features of tunnel blasting vibration.The results showed that the blasting seismic wave is formed with multiple-series blast waves superposition;the initiation network is often divided into several sections at millisecond delay blasting due to limiting of the detonator number,and the superposition manners of blast wave show a lack of control,so the waveform always has several peak vibration velocities.The vibration mitigation effect was studied with engineering tests during initiation with electronic detonators.If the reasonable technical measures were adopted,the blasting vibration peak velocities decreased significantly.Moreover,the mechanism of fault-phase vibration reduction was proposed and discussed by means of high precision of delay initiation of electronic detonators and by using the thought of blasting vibration reduction induced by waveform interference for a reference.The engineering application of tunnel blasting in urban area showed that the blasting design with fault-phase vibration reduction has an ideal effect on vibration reduction.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 3
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