2100. Experimental study on ground vibration of blasting the boulder with tandem shaped charging warhead

Zhenxiong Wang1, Wenbin Gu2, Jianqing Liu3, Jianghai Chen4, Jinglin Xu5, Xin Liu6

College of Field Engineering, PLA University of Science and Technology, Nanjing, 210007, China

4Unit No. 65307 of PLA, Jilin, 132002, China

2Corresponding author

E-mail: 1wangzhenxiong70310@126.com, 2guwenbin1@aliyun.com, 3liujq123321@aliyun.com, 4chenjianghai70310@126.com, 5675917439@qq.com, 6252606718@qq.com

Received 12 December 2015; received in revised form 8 April 2016; accepted 23 April 2016

DOI https://doi.org/10.21595/jve.2016.16726

Abstract. Hazardous effects of blasting the boulder with the new breaking‑blasting equipment‑tandem shaped charging warhead are mainly air shock wave, seismic wave and blast slung shot. Blast-induced ground vibration is one of the inevitable effects and may cause substantial damage to nearby structures. Started from the formation process and mechanism of ground vibration to study the seismic wave, the research attained curve of vibration velocity of monitoring points by TC-4850 and carried out differential and fast Fourier transform analysis of the curve. And the results concluded that blasting vibration with tandem shaped charging warhead mainly comes from prime charge; the attenuation law can be predicted by Sadevís Formula. Explosion vibration frequency range is 20-150 Hz, while with the increase of distance from the blasting center, blasting vibration intensity attenuates rapidly, vibration duration increases and vibration frequency gradually reduces. Compared with general rock blasting, its attenuation rate of blasting vibration is faster with higher frequency and smaller impact on buildings, but the harm effects should not be ignored for the special application environment.

Keywords: tandem shaped charging warhead, ground vibration, seismic wave, experimental study.

References

[1]        Xu H. M., Gu W.B., Huang H. Numerical simulation and experimental investigation on a shaped charge with new structure liner. Proceedings of International Conference on Mechanical Design, Manufacture and Automation Engineering, Phuket, Thailand, 2014.

[2]        Xu H. M., Gu W. B., Zeng Z., et al. Effect of Delay Time on Formation and Penetration of Tandem EFP. Chinese Journal of High Pressure Physics. Vol. 28, Issue 1, 2014, p. 79‑85.

[3]        Weber P. W., Millage K. K., Crepeau J. E., Happ H. J., Gitterman Y., Needham C. E. Numerical simulation of a 100-ton ANFO detonation. Shock Waves, Vol. 25, 2015, p. 127‑140.

[4]        Dewey M. C., Dewey J. M. The physical properties of the blast wave produced by a stoichiometric propane/oxygen explosion. Shock Waves, Vol. 24, 2014, p. 593‑601.

[5]        Ronald P., Kim R. M., Anatol L. Explosion phenomena and effects of explosions on structures. Parts 1-3. ASCE Practice Periodical on Structural Design and Construction, Vol. 15, 2010, p. 135‑169.

[6]        Gordon F. R., et al. Managing rock blasting work in urban environment. ASCE, Practice Periodical on Structural Design and Construction, Vol. 11, Issue 2, 2006, p. 86‑92.

[7]        Donald G. A., Shahram T., Keith A., et al. Ground vibrations produced by surface and near‑surface explosions. Applied Acoustics, Vol. 74, Issue 11, 2013, p. 1279‑1296.

[8]        Lin D. C., Zhang Q., Bai C. H. Random property of ground vertical vibration velocity induced by near ground explosion seismic effect. Explosion and Shock Waves, Vol. 20, Issue 3, 2000, p. 235‑240.

[9]        Ning J. G., Wang C., Ma T. B. Explosion and Shock Dynamics. National Defense Industry Press, Beijing, 2010.

[10]     Zhang Q., Lin D. C., Bai C. H., et al. Investigations of evaluating blast damage power to ground surface targets by explosion seismic effects. Explosion and Shock Waves, Vol. 22, Issue 1, 2002, p. 92‑95.

[11]     Xu H. M., Gu W. B., Liu J. Q., et al. Numerical simulation and experiment study on explosion structure design of tandem shaped charge. Acta Armamentarii. Vol. 35, Issue 2, 2014, p. 170‑175.

[12]     Li H. T., Lu W. B., Shu D. Q., et al. Study of energy attenuation law of blast-induced seismic wave. Chinese Journal of Rock Mechanics and Engineering, Vol. 29, Issue 1, 2010, p. 3364‑3369.

[13]     Li X. B., Ling T. H., Zhang Y. P. Analysis of Blast Vibration Signals Theories and Methods. Science Press, Beijing, 2009.

[14]     Wei H. X., Chen S. H. Effects of main factors of blasting seismic waves on elastic-plastic seismic response of multistory masonry buildings. Explosion and Shock Waves. Vol. 31, Issue 1, 2011, p. 55‑61.

[15]     Liang Q. G., An Y. F., Zhao L., et al. Comparative study on calculation methods of blasting vibration velocity. Rock Mechanics and Rock Engineering, Vol. 44, 2011, p. 93‑101.

[16]     Dowing C. H. Blast Vibration Monitoring and Control. Prentice Hall, Englewood, NJ, 1985.

[17]     Luigi S. Theoretical derivation of a peak particle velocity-distance law for the predition of vibrations from blasting. Rock Mechanics and Rock Engineering, Vol. 42, 2009, p. 547‑556.

[18]     Xie X. Q. Precision Blasting. Huazhong University of Science and Technology Press, Wuhan, 2010.

[19]     Orlenko L. P., Sun C. W. Explosion Physics. Science Press, Beijing, 2011.

[20]     Liang X. Q. Underwater Blasting Technology. Chemistry Industry Press, Beijing, 2013.

[21]     Li H. T., Shu D. Q. Influential factors analysis of blasting vibration attenuation law. Engineering Journal of Wuhan University, Vol. 38, Issue 1, 2005, p. 79‑82.

[22]     Wang X. G., Xu T. R., Zhang Z. Y., et al. GB6722-2003 Safety Regulation for Blasting. Chinese Standard Press, Beijing, 2004.

[23]     Ling T. H., Li X. B. Laws of energy distribution in different frequency bands for blast vibration signals. Journal of Central South University of Technology, Vol. 35, Issue 5, 2004, p. 310‑315.

[24]     Singh P. K., Roy M. P. Damage to surface structures due to underground coal mine blasting: apprehension or real case? Environmental Geology, Vol. 53, 2008, p. 1201‑1211.

Cite this article

Wang Zhenxiong, Gu Wenbin, Liu Jianqing, Chen Jianghai, Xu Jinglin, Liu Xin Experimental study on ground vibration of blasting the boulder with tandem shaped charging warhead. Journal of Vibroengineering, Vol. 18, Issue 5, 2016, p. 2986‑2996.

 

© JVE International Ltd. Journal of Vibroengineering. Aug 2016, Vol. 18, Issue 5. ISSN 1392-8716