doi:

DOI: 10.3724/SP.J.1249.2017.03238

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2017/34:3 PP.238-244

Influence scope of blasting vibration for construction of new tunnel undercrossing existing roads


Abstract:
By taking the blasting construction of the Baohan highway project as an example, this paper focuses on the blasting vibration influence on the existing roads nearby by monitoring the blasting vibration velocity. The results show that existing roads nearby will not resonate with the blasting when the dominant frequency of blasting vibration is between 10-50 Hz during monitoring of tunnel blasting construction. Based on the in-situ monitoring results, the vertical vibration velocity should be principally monitored because it is higher than the radial and tangential vibration velocities and it is significantly destructive to the buildings. To ensure the safety of structures and transportation of existing roads, the blasting vibration velocities of key points are supposed to be less than 2.0 cm/s for existing roads of the shallow-buried tunnel underpass with large cross-section and soft surrounding rock. Furthermore, the monitoring data show that the influence scope of blasting vibration wave to existing roads is about 30 m, which is consistent with the theoretical calculation. These results provide references to the general tunnel construction.

Key words:highway tunnel,blasting construction,blasting vibration,vibration velocity,vibration frequency,existing roads

ReleaseDate:2017-06-16 14:08:43



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