Monitoring and Analysis of Blasting Vibration of Diversion Tunnel Excavation in Layered Rock Mass

Abstract:

In order to insure the safety and stability of the existed dam body and dam curtain during the diversion tunnel excavation, the vibration velocities were analyzed based on in-site blasting vibration monitoring. Result shows that the elevation difference between explosion point and monitoring points has a great impact on the vibration velocity in addition to single fire dynamite and blast center distance. During data analysis, the traditional empirical formula of attenuation of blasting earthquake must be amended. Through contrasting and analyzing, the amended formula of attenuation of blasting earthquake wave is precise relatively. At the same time, two collapses during the diversion tunnel excavation were analyzed based on the characteristics of layered rock mass and fault distribution, and the explosion parameters were optimized, so that the damage effect of blasting vibration was controlled effectively. This research also takes a good effect in other similar works.

• Periodical: Applied Mechanics and Materials (Volumes 249-250)
• Pages: 1047-1052
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.249-250.1047
• Online since: December 2012
• Authors: Hua Feng Deng, Min Zhu, Le Hua Wang, Ji Fang Zhou
• Keywords: Attenuation Law, Blasting Vibration, Elevation Effect, Layered Rock Mass

References

[1] Xuemin Zhang, Jun-sheng Yang, Baochen Liu, Study on blasting seismic dynamic effect for tunnels with close interval in bedded rock mass[J], Journal of Hunan University of Science & Technology (Natural Science Edition), 200, 21(4): 70-74.

[2] Fengcheng Liu , Wuxing Hu , Xuechen Cui, Analysis on test results of blasting vibration of anchored crane beam in xilongchi power station [J], Journal of Yangtze Rive Scientific Research Institude, 2008, 25(5): 171-174.

[3] Yunpeng Li, Chuanzhi Ai , Changling Han , Ming Huo, Study on dynamics effect caused by blasting construction by numerical simulation for tunnels with small spacing [J], Explosion and Shock Waves, 2007. 27(1): 75-81.

[4] Tan Zhong-sheng, Yang Xiao-lin, Wang Meng-shu, Effect of blast in double line tunnel on existing tunnel [J], Chinese Journal of Rock Mechanics and Engineering, 2003, 22(2): 281-285.

[5] Hongbing Xia, Haibo Wang, Qi Zong, Comprehensive analysis of controlling technology of blasting vibration effect [J], Engineering Blasting, 2007, 13(2): 83-86.

[6] GB 6722-2003, Blasting Safety Regulations[S]. 2004: 40-43.

[7] Baozhen Li, Dian Wang, Discussion on the relationship between highness difference and blasting vibration and attenuation orderliness [A], The Paper Volume of 6th National Engineering Blasting Academic Conference[C], 1997. 778-783.

[8] Shouru Chen, The compare and choice of two formula of particle vibration forecasting [A], 7th National Engineering Blasting Academic Conference[C], 2001. 702-706.

[9] Mingbiao Xu, Dehong Peng, Analysis on the vibration measurement in high slope excavation of Xiao wan Hydropower Station [J], Yangtze River, 2007, 38(2): 135-138.