Study of big charge blasting damping and monitoring under intracity complicated environment

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (1) : 156-161.

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Study of big charge blasting damping and monitoring under intracity complicated environment

JIANG Yao-gang1; SHEN Zhao-wu1; YANG Chang-de2

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Abstract

With the background of one garden building foundation and underground garage excavation blasting, several of vibration damping technologies were adopted to actualize large blasting excavation in city, blasting vibration was real-timely monitored by instrument, and vibration data was analyzed. Finding that the vibration peak of the monitor points around blasting zone was too small (less than 1cm/s) to cause damage for surrounding structure. The vibration peak, main frequency and duration time in fore-and-aft monitoring points was more than one in transverse, the frequency spectrum energy distribution in fore-and-aft monitoring points was more centralized than one in transverse, The vertical signal frequency spectrum energy of the monitoring points were centralized between 7.8125 and 62.5Hz. with the increase of height when the blasting vibration propagate between floors in high buildings, the vertical blasting vibration peak and signal response energy increased, and the frequency spectrum energy distribution was more centralized, the vibration peak on the top floor was about two times than one on the bottom，the signal energy on the top floor is about three times than that on the bottom of buildings.

Key words

mechanics of explosion / vibration damping technology / vibration analysis / vibration peak/main frequency/duration time / high building amplification effect

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JIANG Yao-gang;SHEN Zhao-wu;YANG Chang-de. Study of big charge blasting damping and monitoring under intracity complicated environment[J]. Journal of Vibration and Shock, 2012, 31(1): 156-161