Study on Vibration Laws of Ground Particles Cause by Shallow Tunnel Blasting Construction

摘要

In order to study ground vibration laws of shallow tunnel blasting construction, so in this paper, we put Third Bid of Qingdao Metro Line 3 as the engineering background, selecting the monitoring segment blasting vibration monitoring, studying blasting vibration peak velocity. Basing on the measured data, analyzing the variation regularity resultant velocity vector peak velocity along the tunnel axis direction. The study found that resultant velocity vector peak did not occur just above the tunnel workface, but away from the working face in 1m ～ 1.5m the range. Resultant velocity vector peak located in front of the workface is 1.02 to 1.45 times of resultant velocity vector peak located behind of the workface. Resultant velocity vector peak located in front of the workface is 2.26 to 2.5 times of resultant velocity vector peak above the workface. Resultant velocity vector peak behind the workface is 2.3 to 3 times of resultant velocity vector peak above the workface.