Study on Shallow Tunnel Blasting Excavation and Vibration Controlling

摘要

Based on the practice of Huo Langyu tunnel of Mixing road reconstruction, this paper studies the monitoring of ground surface vibration and the technology of controlled blasting. The results show: (1) the ground surface vibration decline from constructed position to non-excavated areas along tunnel excavation direction. (2) The vibration control of wedge cutting holes blasting is the key to reduce or eliminate shallow tunnel vibrating calamity. And the replacement of the multi-stage small wedge cutting holes to the big wedge cutting holes ameliorates blasting vibration and rock fragmentation. (3) The overall monitoring of shallow tunnel boring blasting vibration and the effects, and optimum of the blasting design not only reduce blasting vibration but also ensure large circulation footage.