Study on Effect of Blasting Vibration on Surface of Particles in Urban Hard Rock Tunnel

摘要

Put the first Phase Project of Qingdao Metro (line 3) civil 03 bid section TAI-YAN interval of blasting construction as the background In this paper, select the test section to blasting test, in ground position on the ais of the tunnel workface arrange the measuring points and location of measuring points remain the same. Based on the measured data, studied on the law of blasting vibration of cutting parts of each of the driving cycle. The research result show that the cutting part of vibration velocity peak appeared in behind the tunnel woekface 1～3m; Rear vibration composite speed of the tunnel workface is speed of the tunnel workface is 1.0～1.4 times in front of the particle vibration composite speed; The main vibration frequency in front of tunnel workface and rear particle are above 15HZ.