ANALYSIS OF COLLAPSE VIBRATION AND BLASTING VIBRATION IN FOLDING BLASTING DEMOLITION OF JINMA BUILDING

According to the bidirectional folding blasting demolition practice of Jinma building in Dalian,regression analysis of the attenuation law of blasting and collapse vibrations in the demolition of the building was carried out and the values of K and α were obtained.The time history of the vibration wave was analyzed,indicating that the whole waves mainly consisted of twice blasting vibration and once collapse vibration of the building.The two vibrations were discussed by comparing the vibrating velocity and frequency characters,obtaining that the velocity of collapse vibration was greater than blasting vibration and was the main factor affecting the surrounding buildings,the frequency of collapse vibration was lower and was easier to lead to resonance.So velocity and frequency should be used as criteria for the safety of the blasting demolition in city.