Research On The Propagation Law Of High-rise Building Vibration Under Blasting Vibration

In order to control the impact of blasting vibration on high-rise buildings,firstly,based on the background of Baihua Avenue blasting project,relying on the national natural fund project,on the basis of existing research,the combination of theoretical analysis,field test and numerical simulation test.this paper studies the propagation law of vibration speed,acceleration,displacement and main vibration frequency of high-rise buildings within the range of 50-250 m of blasting center distance,under the condition of maximum single shot quantity of 30 kg.Then,the reason of vibration velocity propagation law is analyzed.Finally,engineering application is carried out.The main conclusions are as follows.1.With the increase of floors,the radial and tangential peak vibration velocity decreases firstly and then increases.The low layer and high layer of buildings have large vibration velocity,while the middle-low layer has small vibration velocity.The vertical peak velocity increases with the increase of floors,which has the effect of elevation amplification.The vertical peak vibration velocity is greater than the radial and tangential peak vibration velocity.The vibration velocity of particles in high-rise buildings with smaller blasting center distance is greater than that in high-rise buildings with larger blasting center distance.2.With the increase of floors,the radial and tangential peak acceleration decreases,and the vertical peak acceleration decreases firstly and then increases.The acceleration of particles in high-rise buildings with smaller blasting center distance is greater than that in high-rise buildings with larger blasting center distance.3.The radial and tangential displacements are negligible,and the vertical displacements increase with the increase of floors.4.The first 10 natural frequencies of the 18 storey high-rise building are between1.04 Hz and 8.4Hz,and blasting load frequencies of the 18 storey high-rise building are about 10 Hz.There is resonance in buildings.5.The engineering application shows that the relative error between the measured vibration speed and the predicted vibration speed is within 15%.The numericalsimulation test can accurately predict the vibration propagation law of high-rise buildings under different blasting center horizontal distance and blasting center vertical distance,which provides a reference for the vibration control and vibration prediction of high-rise buildings.