Study on the Influence of Blasting Vibration of Highway Tunnel on the Regional Buildings at the Entrance
While blasting a highway tunnel in Guizhou province,the influence of blasting vibration of the tunnel on the regional buildings at the entrance is studied by field monitoring method.According to the principle of measuring point layout,four representative houses in the area affected by blasting vibration are selected for monitoring.According to the first monitoring results and the actual situation of the site,the blasting vibration safety allowable standard of the regional buildings is determined to be 2.0 cm/s,and the limited charge range of the maximum section of blasting operation is calculated to be 12.3-13.2 kg.The maximum charge in the single section is adjusted to 13.0 kg.The monitoring results after adjusting the blasting plan show that the peak vibration velocity of the four measuring points is less than 2.0 cm/s.Combined with the field investigation before and after adjusting the blasting plan,it is verified that the selected vibration control standard of the regional buildings and the proposal for selecting the maximum charge value are reasonable.
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