Prediction of Near-Field Wave Attenuation Due to a Spherical Blast Source
- Authors
- Ahn, Jae-Kwang; Park, Duhee
- Issue Date
- Nov-2017
- Publisher
- SPRINGER WIEN
- Keywords
- Attenuation; Blast wave; Near-field; Far-field; Numerical simulation
- Citation
- ROCK MECHANICS AND ROCK ENGINEERING, v.50, no.11, pp.3085 - 3099
- Indexed
- SCIE
SCOPUS
- Journal Title
- ROCK MECHANICS AND ROCK ENGINEERING
- Volume
- 50
- Number
- 11
- Start Page
- 3085
- End Page
- 3099
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4011
- DOI
- 10.1007/s00603-017-1274-3
- ISSN
- 0723-2632
- Abstract
- Empirical and theoretical far-field attenuation relationships, which do not capture the near-field response, are most often used to predict the peak amplitude of blast wave. Jiang et al. (Vibration due to a buried explosive source. PhD Thesis, Curtin University, Western Australian School of Mines, 1993) present rigorous wave equations that simulates the near-field attenuation to a spherical blast source in damped and undamped media. However, the effect of loading frequency and velocity of the media have not yet been investigated. We perform a suite of axisymmetric, dynamic finite difference analyses to simulate the propagation of stress waves induced by spherical blast source and to quantify the near-field attenuation. A broad range of loading frequencies, wave velocities, and damping ratios are used in the simulations. The near-field effect is revealed to be proportional to the rise time of the impulse load and wave velocity. We propose an empirical additive function to the theoretical far-field attenuation curve to predict the near-field range and attenuation. The proposed curve is validated against measurements recorded in a test blast.
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