An Analysis of the Results of Trial Blasting of Site Development Project in the Volcanic Island

Authors: Dong Wook Lee, Seung Hyun Kim

Abstract:

Trial blasting is conducted to identify the characteristics of the blasting of the applicable ground before production blasting and to investigate various problems posed by blasting. The methods and pattern of production blasting are determined based on an analysis of the results of trial blasting. The bedrock in Jeju Island, South Korea is formed through the volcanic activities unlike the inland areas, composed of porous basalt. Trial blasting showed that the blast vibration frequency of sedimentary and metamorphic rocks in the inland areas is in a high frequency band of about 80 Hz while the blast vibration frequency of Jeju Island is in a low frequency band of 10~25 Hz. The frequency band is analyzed to be low due to the large cycle of blasting pattern as blast vibration passes through the layered structured ground layer where the rock formation and clickers irregularly repeat. In addition, the blast vibration equation derived from trial blasting was R: 0.885, S.E: 0.216 when applying the square root scaled distance (SRSD) relatively suitable for long distance, estimated at the confidence level of 95%.

Keywords: Attenuation index, basaltic ground, blasting vibration constant, blast vibration equation, clinker layer.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1127876

References:

[1] H. S. Yang, N. S. Kim, H. D. Jang, W. B. Kim, Y. H. Ko, S. J. Kim, J. G. Kim, and H. S. Moon, “Study on optimization of blast design for improving fragmentation in Jeju basalt rock area,” J. of Korean Society of Explosives & Blasting Engineering, Vol. 29, No. 2, pp. 89-99, Dec. 2011.
[2] D. W. Lee, and S. H. Kim, “Development of Blast Vibration Equation Considering the Polymorphic Characteristics of Basaltic Ground,” World Academy of Science, Engineering and Technology, Proc. of 18th Int. Sci. Ac., Geo. and Env. Eng., London, U.K., pp. 979-982, 2016.
[3] H. Robert, Blasters Handbook 17th ed., ISEE, Cleveland, OH USA, pp. 594, 1998.
[4] D. E. Siskind, Vibrations from Blasting, ISEE, Cleveland, OH USA, pp.14-15, pp. 17-28, 2000.
[5] D. E. Siskind, M. S. Stagg, J. W. Kopp and C. H. Dowding, Structure Response and Damage Produced by Ground Vibration From Surface Mine Blasting, USBM RI 8507, 1980.
[6] D. J. Inman, Engineering vibration, Prentice Hall Inc., Upper Saddle River, NJ, US, pp. 69-70, 1996.
[7] C. H. Dowding, Construction vibrations, Prentice Hall Inc., Englewood Cliffs, NJ, US, pp. 620, 1996.
[8] B. H. Choi, and C. H. Ryu, “Consideration on the Relation between Vibration Level and Peak Particle Velocity in Regulation of Ground Vibration”, J. of Korean Society of Explosives & Blasting Engineering, Vol.30, No.2, pp. 1-8, Dec. 2012.
[9] G. W. Koh, Characteristics of the groundwater and hydrogeology implications of the Seogwipo formation in Cheju island, Ph. D. dissertation, Pusan Na. Univ., Korea, pp. 39-61, 1997.
[10] Park et al., Geological Report of Seogwipo-Hahyori Sheet (1:50,000 Scale), Jeju-do and Korea Institute of Geology, Mining and Materials, Korea, pp. 50-51, 2000.
[11] M. J. Le Bas, R. W. Lemaitre, A. Streckeisen and B. Zanettin, “A chemical classification of volcanic rocks based on the total alkali-silica diagram,” J. Petrol., Vol 27, pp. 745-750, 1986.
[12] MOCT (Ministry of Construction and Transportation of Korea), Blasting design and construction guidelines to road construction. No. 11-1500000-001841-01, Dec. 2006.