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Blasting Vibration Reduction Model for Large-Section Shallow Tunnels Approaching Existing Buildings
(1 School of Civil Engineering, Xi'an University of Architecture and Technology, Xi’ an 710055; 2 China Railway Construction Bridge Engineering Bureau Group Co. Ltd., Tianjin 300300; 3 The 2nd Engineering Co. Ltd. of China Railway Construction Bridge Engineering Bureau Group, Shenzhen 518083)
Abstract In order to study the effects of blasting construction on structure safety for shallow tunnels with large sections that pass through or approach existing buildings in mountain areas, two blasting vibration reduction models were established based on engineering practices. The findings of the experimental study and analysis of the two models are as follows: 1) during upper bench excavation, the ring vibration reduction model for the bench had a more remarkable damping capacity than the left-and-right alternating vibration reduction model in terms of blasting construction; 2) the rational design of the maximum explosive charge for a single section and the detonator rank are key indicators for controlled blasting; 3) as for controlled blasting construction at the middle and lower benches in shallow tunnels with large sections, the layered and segmented blasting is superior to blasting from left to right.
Abstract：
In order to study the effects of blasting construction on structure safety for shallow tunnels with large sections that pass through or approach existing buildings in mountain areas, two blasting vibration reduction models were established based on engineering practices. The findings of the experimental study and analysis of the two models are as follows: 1) during upper bench excavation, the ring vibration reduction model for the bench had a more remarkable damping capacity than the left-and-right alternating vibration reduction model in terms of blasting construction; 2) the rational design of the maximum explosive charge for a single section and the detonator rank are key indicators for controlled blasting; 3) as for controlled blasting construction at the middle and lower benches in shallow tunnels with large sections, the layered and segmented blasting is superior to blasting from left to right.
2016, Vol. 53 