Analysis On The Characteristics Of Collapse Touchdown Vibration In Blasting Demolition Of Building And Structures

Base on the monitored data from the demolition blasting of the Technology Building in Wuhu City and the chimney of the Zhujiang heat plant factory in Shenyang,analysis and compare the peak particle velocity and attenuation of the main vibration frequency in the process of the demolition blasting in the case with or without damping protective measures, calculate the rate of change of velocity and frequency in the case of taking damping measures, and demonstrate the effectiveness of damping measures; regression analysis of two collapsing touchdown demolition blasting vibration empirical formula study of the structure of the building to sit under the framework touchdown vibration attenuation law; the attenuation coefficient, when comparing the difference between the process of collapse blasting two structures, first propose that the buildings squatting phenomenon will seriously affect the peak velocity of the size of the attenuation coefficient values f;Through the study of vibration attenuation law when the building squatting touchdown obtain that the particles vibration speed pouring in the same direction is larger than that of the particles in tangential direction; Using the basic principles of dimensional analysis and establish a quasi-logarithmic of the squatting frequency. And regression calculations have been two types of field data structures collapse touchdown main vibration frequency of the vibration prediction formula; the structure of power by blasting seismic effect in response to the role of comparative analysis results with the same conditions under conventional seismic waves, verification Blasting after the completion of the building near the security structure.