Browse > Article
http://dx.doi.org/10.9711/KTAJ.2014.16.1.051

Generation of blast load time series under tunnelling  

Ahn, Jae-Kwang (Department of Civil and Environmental Engineering, Hanyang University)
Park, Duhee (Department of Civil and Environmental Engineering, Hanyang University)
Shin, Young-Wan (Hakyong Engineering)
Park, Inn-Joon (Department of Civil Engineering, Hanseo University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.16, no.1, 2014 , pp. 51-61 More about this Journal
Abstract
It is necessary to perform a dynamic analysis to numerically evaluate the effect of blasting on nearby facilities. The blast load time history, which cannot be directly measured, is most often determined from empirical equation. The load has to be adjusted to account for various factors influencing the load and the frequency, but there is not a clear guideline on how to adjust the load. In this study, a series of 2D dynamic numerical analyses that simulates a closely monitored test blasting is performed, from which the blast load that matches the measured vibrations are derived. In the analyses, it is assumed that the hole generated by the blasting is in the form of a circle, and the load was applied normally to the wall of the opening. Special attention was given in selecting the damping ratio for the ground, since it has important influence on the wave propagation and attenuation characteristics of the blast induce waves. The damping ratio was selected such that it matches favorably with the attenuation curve of the measurement. The analyses demonstrate that the empirical blast load widely used in practice highly overstimates the vibration since it does not account for the energy loss due to rock fragmentation. If the empirical load is used without proper adjustment, the numerical analysis may seriously overstimate the predicted vibration, and thus has to be reduced in the analysis.
Keywords
Blast vibration; Detonation pressure; Fracture zone; Attenuation; Numerical analysis;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Park, D., Kim, T.G., Ahn, J.K., Park, I.J. (2013), "Amplification characteristics of mountain slope", journal of KOSHAM, Vol. 13, No. 2, pp. 117-123.
2 Lee, I.M., Park, B.K., Park, C.W. (2004), "Probabilistic analysis of blasting loads and Blast-induced rock mass responses in tunnel excavation", Journal of Korean Geotechnical Society, Vol. 20, No. 4, pp. 89-102.   과학기술학회마을
3 Lysmer, J., Kuhlemeyer, R. (1969), "Finite element model for infinite media", Journal of Engineering Mechanics Division. ASCE, Vol. 95, pp. 859-877.
4 Shin, J.H., Moon, H.G., Chae, S.E. (2011), "Effect of blast-induced vibration on existing tunnels in soft rocks", Tunnelling and Underground Space Technology, Vol. 26, No. 1, pp. 51-61.   DOI
5 Villiappan, S., Murti, V. (1984), Finite element constraints in the analysis of wave propagation problem, UNICV Report No. R-218, The University of New South Wales, School of Civil Engineering. p. 48.
6 Yang, H.S., Lim, S.S., Kim, W.B. (2003), "Tunnel blasting design with equations obtained from borehole and crater blasting", Journal of Korean Geotechnical Society, Vol. 19, No. 5, pp. 327-333.   과학기술학회마을
7 Zerwer, A., Cascante, G., Hutchinson, J. (2002), "Parameter estimation in finite element simulations of rayleigh waves", Journal of geotechnical and geoenvironmental engineering, Vol. 128, No. 3, pp. 250-261.   DOI   ScienceOn
8 Jeon, S.S., Jang, Y.W., Jung, D.H. (2007), "Estimation of blasting distance satisfying allowable peak particle velocity - Analytical & Numerical analysis approach", journal of KOSHAM, Vol. 7, No. 1, pp. 39-46.   과학기술학회마을
9 Choi, S.O., Park, E.S., Sun, W.C., Chung, S.K. (2004), "A Study on the blasting dynamic analysis using the measurement vibration waveform", Journal of Korean Society for Rock Mechanics, Vol. 14, No. 2, pp. 108-120.   과학기술학회마을
10 Hino, K. (1959), Theory and practice of blasting, Nippon Kayaku Co Ltd.
11 Itasca Consulting Group (2008), "FLAC (Fast Lagrangian Analyses of Continua) v.6.0".
12 Konya, C.J., Walter, E.J. (1991), Rock blasting and overbreak control, National Highway Institute, p. 5.
13 Kramer, S.L. (1996), Geotechnical earthquake engineering, Prentice Hall, Upper Saddle River, N.J.
14 Kuhlemeyer, R.L., Lysmer, J. (1973), "Finite element method accuracy for wave propagation problems", Journal of Soil Mechanics & Foundations Div, Vol. 99, p. 421.
15 Liu, Q., Tidman, P. (1995), "Estimation of the dynamic pressure around a fully loaded blast hole", Canmet/MRL technical report 95-014, Canmet/MRL expermental mine, PO Box 1300, Valda'r Quebec.
16 Starfield, A.M., Pugliese, J.M. (1968), "Compression waves generated in rock by cylindrical explosive charges: a comparison between a computer model and field measurements", International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts: Elsevier, 5, pp. 65-77.   DOI   ScienceOn