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| Attenuation formula of the dominant frequency of blasting vibration during tunnel excavation |
| LIU Da1，2，LU Wenbo1，2，CHEN Ming1，2，YAN Peng1，2 |
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education，Wuhan
University，Wuhan，Hubei 430072，China)
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Abstract The blasting in the holes detonated in the same delay in the process of tunnel drilling and blasting are regarded as the internal excitation load in a spherical cavity in infinite rock body and the natural frequency of a hollow sphere with an infinite external diameter is analyzed. The attenuation formula of the dominant frequency of blasting vibration in tunnel drilling and blasting excavation is deduced with the method of dimensional analysis， and is validated with the measured dominant frequency of blasting vibration in Pubugou hydropower station. According to the relationship between the charge weight and the radius of spherical cavity under the condition of spherical charge，another form of the proposed formula with the parameter of the radius of spherical cavity replaced with the charge weight has been used for comparison. It was found that the radius of spherical cavity was generally more desirable than charge weight for fitting analysis.
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2018, Vol. 37 
