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Study on Millisecond Blasting Vibration Velocity and Stress Field in Tunnel

LOU Xiao-ming1,ZHENG Jun-jie1,MA Jian-jun2,CAI Lu-jun2(1.School of Civil Eng.& Mechanics,HUST,Wuhan 430074,China;2.Wuhan University of Science and Technology,Wuhan 430081,China)  
According to explosion dynamics and elastic wave theory,the blasting vibration velocity and stress field,induced by simultaneously blasting in the damaged rock mass are analyzed.And then,based on the superimposed properties of blasting wave,the analytic solutions of particle vibration velocity and stress of tunnel surrounding rock after millisecond blasting are put forward.The results show that seismic waves adjacent to the delay intervals in millisecond blasting are close to each other and superimposed with the increase of propagation distance.Millisecond blasting has not only the good effects of reducing vibration by wave interference,but also increases the probability of selective magnification on blasting-induced vibration.The study provides references for tunneling to choose the appropriate blasting excavation methods,reduce the construction error and enhance stability of the surrounding rock.
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