Propagation characteristics of blast-induced vibration to fractured zone

In evaluation of blast-induced vibration, peak particle velocity (PPV) is generally calculated by using attenuation relation curve. Calculated velocity is compared with the value in legal requirements or the standards to determine the stability. Attenuation relation curve varies depending on frequency of test blasting, geological structure of the site and blasting condition, so it’s difficult to predict accurately using such an equation. Since PPV is response value from the ground, direct evaluation of the structure is impractical. Because of such a limit, engineers tend to use the commercial numerical analysis program in evaluating the stability of the structure more accurately. However, when simulate the explosion process using existing numerical analysis program, it’s never easy to accurately simulate the complex conditions (fracture, crushing, cracks and plastic deformation) around blasting hole. For simulating such a process, the range for modelling will be limited due to the maximum node count and it requires extended calculation time as well. Thus, this study is intended to simulate the elastic energy after fractured zone only, instead of simulating the complex conditions of the rock that results from the blast, and the analysis of response characteristics of the velocity depending on shape and size of the fractured zone was conducted. As a result, difference in velocity and attenuation character calculated depending on fractured zone around the blast source appeared. Propagation of vibration tended to spread spherically as it’s distanced farther from the blast source.

keywords: Blast vibration, Attenuation curve, Blast source, Fractured zone, Numerical analysis, 발파진동, 감쇠곡선, 폭원, 파쇄영역, 수치해석

Reference

1. Ahn, J.K., Park, D.H. (2017), “Prediction of near-field wave attenuation due to a spherical blast source”, Rock Mechanics and Rock Engineering, Vol. 50, No.11, pp. 3085-3099.

2. Ahn, J.K., Park, D.H., Shin, Y.W., Park, I.J. (2014), “Generation of blast load time series under tunnelling”, Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 1, pp. 51-61.

3. AUTODYN, A. (2009), “Interactive non-linear dynamic analysis software, version 12, user’s manual”, SAS IP Inc.

4. Blair, D.P. (2014), “Blast vibration dependence on charge length, velocity of detonation and layered media”, International Journal of Rock Mechanics and Mining Sciences, Vol. 65, pp. 29-39.

5. Blair, D.P. (2015), “Wall control blasting. Rock fragmentation by blasting”, Australia in Proceedings 11th International Symposium on Rock Fragementation by Blasting, pp. 13-26

6. Chen, S.G., Cai, J.G., Zhao, J., Zhou, Y.X. (2000), “Discrete element modelling of an underground explosion in a jointed rock mass”, Geotechnical & Geological Engineering, Vol. 18, No. 2, pp. 59-78.

7. Choi, S.O., Park, E.S., Sunwoo, 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.

8. Company, A.P. (1987), Explosives and rock blasting, Dallas.

9. Deng, X.F., Zhu, J.B., Chen, S.G., Zhao, Z.Y., Zhou, Y.X., Zhao, J. (2014), “Numerical study on tunnel damage subject to blast-induced shock wave in jointed rock masses”, Tunnelling and Underground Space Technology, Vol. 43, pp. 88-100.

10.

10. Duvall, W.I. (1953), “Strain-wave shapes in rock near explosions”, Geophysics, Vol. 18, No. 2, pp. 310-323.

11.

11. Haibo, L., Xiang, X., Jianchun, L., Jian, Z., Bo, L., Yaqun, L. (2011), “Rock damage control in bedrock blasting excavation for a nuclear power plant”, International Journal of Rock Mechanics and Mining Sciences, Vol. 48, No. 2, pp. 210-218.

12.

12. Hao, H., Wu, Y., Ma, G., Zhou, Y. (2001), “Characteristics of surface ground motions induced by blasts in jointed rock mass”, Soil Dynamics and Earthquake Engineering, Vol. 21, No. 2, pp. 85-98.

13.

13. Itasca Consulting Group, I. (2011), Fast Lagrange Analysis of Continua, Version 7.0.

14.

14. Jeon, S.S., Kim, D.S., Jang, Y.W. (2007), “Stability assessment of concrete lining and rock bolt of the adjacent tunnel by blast-induced vibration”, Journal of Korean Geotechnical Society, Vol. 23, No. 10, pp. 33-45.

15.

15. Jiang, J., Baird, G., Blair, D. (1998), “Polarization and amplitude attributes of reflected plane and spherical waves”, Geophysical Journal International, Vol. 132, No. 3, pp. 577-583.

16.

16. Jiang, J., Blair, D.P., Baird, G.R. (1995), “Dynamic response of an elastic and viscoelastic full-space to a spherical source”, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 19, No. 3, pp. 181-193.

17.

17. Konya, C.J., Walter, E.J. (1991), Rock blasting and control overbreak, National Highway Institute, pp. 5.

18.

18. Lu, W., Yang, J., Chen, M., Zhou, C. (2011), “An equivalent method for blasting vibration simulation”, Simulation Modelling Practice and Theory, Vol. 19, No. 9, pp. 2050-2062.

19.

19. Lysmer, J., Kuhlemeyer, R. (1969), “Finite dynamic model for infinite media”, Journal of Engineering Mechanics Division. ASCE, Vol. 95, pp. 859-878.

20.

20. Park, D.H., Shin, J.H., Yun, S.U. (2010), “Seismic analysis of tunnel in transverse direction part II:Evaluation of seismic tunnel response via dynamic analysis”, Journal of Korean Geotechnical Society, Vol. 26, No. 6, pp. 71-85.

21.

21. Richart, F.E., Hall, J.R., Woods, R.D. (1970), “Vibrations of soils and foundations”, pp. 414.

22.

22. Sainoki, A., Mitri, H.S. (2016), “Dynamic modelling of fault slip induced by stress waves due to stope production blasts”, Rock Mechanics and Rock Engineering, Vol. 49, No. 1, pp. 165-181.

23.

23. Siskind, D.E. (2000), “Vibration from blasting, international society of explosives engineers”, Cleveland, OH, USA.

24.

24. 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, Vol. 5, No. 1, pp. 65-77.

25.

25. Wu, C., Lu, Y., Hao, H. (2004), “Numerical prediction of blast-induced stress wave from large-scale underground explosion”, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 28, No. 1, pp. 93-109.

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Article Contents

Vol.19 No.6

Propagation characteristics of blast-induced vibration to fractured zone

Abstract

Reference

(사)한국터널지하공간학회