Analysis of the Vibration Influence of Foundation Pit Blasting Excavation on Adjacent Tunnels
In order to study the vibration influence of foundation pit blasting construction on the adjacent tunnels,a foundation pit blasting excavation project of a nearby urban rail tunnel in Zhuhai was taken as an example.Based on the blasting design scheme,the dynamic response of the tunnel under blasting load was simulated by FLAC3D,the variation law of blasting vibration with the distance from the blasting center was analyzed,and the vibration effect of the tunnel was studied.Combined with field monitoring,the vibration reduction effect of the damping hole was evalu-ated.The results show that the site coefficient and attenuation index have significant impact on the maximum explosive quantity in the same section;The blasting vibration attenuates with the increase of the distance from the blasting center.The vibration effect of the section near the explosionsource is obvious and the attenuation is faster,and the attenuation of the section far from the explosion source is slower;The vibration effect of blasting excavation has a great influence on the safety of the tunnel,especially on the side of the tunnel facing the blasting surface;The setting of damping holes will change the distribution law of peak vibration velocity of tunnel section.The vibration reduction effect of a row of damping holes is remarkable.The vibration reduction efficiency tends to be relatively stable with the increase of the number row of damping holes.The research can provide reference for similar projects in future.
foundation pit blasting excavationadjacent tunnelvibration effectdistance from the blasting centerdamping hole
万方数据
维普
