A Numerical Study on the Screening of Blast-Induced Waves for Reducing Ground Vibration |
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Authors: | Dohyun Park Byungkyu Jeon Seokwon Jeon |
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Institution: | (1) The Board of Audit and Inspection of Korea, Seoul, South Korea;(2) School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul, South Korea;(3) Rock Mechanics and Rock Engineering Laboratory, Department of Energy Systems Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, 151-744, South Korea |
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Abstract: | Blasting is often a necessary part of mining and construction operations, and is the most cost-effective way to break rock,
but blasting generates both noise and ground vibration. In urban areas, noise and vibration have an environmental impact,
and cause structural damage to nearby structures. Various wave-screening methods have been used for many years to reduce blast-induced
ground vibration. However, these methods have not been quantitatively studied for their reduction effect of ground vibration.
The present study focused on the quantitative assessment of the effectiveness in vibration reduction of line-drilling as a
screening method using a numerical method. Two numerical methods were used to analyze the reduction effect toward ground vibration,
namely, the “distinct element method” and the “non-linear hydrocode.” The distinct element method, by particle flow code in
two dimensions (PFC 2D), was used for two-dimensional parametric analyses, and some cases of two-dimensional analyses were
analyzed three-dimensionally using AUTODYN 3D, the program of the non-linear hydrocode. To analyze the screening effectiveness
of line-drilling, parametric analyses were carried out under various conditions, with the spacing, diameter of drill holes,
distance between the blasthole and line-drilling, and the number of rows of drill holes, including their arrangement, used
as parameters. The screening effectiveness was assessed via a comparison of the vibration amplitude between cases both with
and without screening. Also, the frequency distribution of ground motion of the two cases was investigated through fast Fourier
transform (FFT), with the differences also examined. From our study, it was concluded that line-drilling as a screening method
of blast-induced waves was considerably effective under certain design conditions. The design details for field application
have also been proposed. |
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Keywords: | Screening of waves Line-drilling Blast-induced vibration Reduction of ground vibration |
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