Development of Blast Vibration Equation Considering the Polymorphic Characteristics of Basaltic Ground

Geological structure formed by volcanic activities shows polymorphic characteristics due to repeated cooling and hardening of lava. The Jeju region is showing polymorphic characteristics in which clinker layers are irregularly distributed along with vesicular basalt due to volcanic activities. Accordingly, resident damages and environmental disputes occur frequently in the Jeju region due to blasting. The purpose of this study is to develop a blast vibration equation considering the polymorphic characteristics of basaltic ground in Jeju. The blast vibration equation consists of a functional formula of the blasting vibration constant K that changes according to ground characteristics, and attenuation index n. The case study results in Jeju showed that if there are clinker layers, attenuation index n showed a distribution of -1.32~-1.81, whereas if there are no clinker layers, n was -2.79. Moreover, if there are no clinker layers, the frequency of blast vibration showed a high frequency band from 30Hz to 100Hz, while in rocks with clinker layers it showed a low frequency band from 10Hz to 20Hz.

• Dong Wook Lee
• Seung Hyun Kim

• Blast vibration equation
• basaltic ground
• clinker layer
• blasting vibration constant
• attenuation index.

[1] J. M. Nam, H. S. Ko, and D. I. Oh, “A Study on Strength Characteristics of Jeju - island's Scoria(Song-E)”, J. of the Korean Society of Road Engineers, Vol.5, No.4, pp.37-47, Dec. 2003.
[2] Ministry of construction and transportation of Korea, Blasting design and construction guidelines to road construction, Dec. 2006.
[3] 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.
[4] 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, pp.31, 1980.
[5] D. J. Inman, Engineering vibration, Prentice Hall Inc., Upper Saddle River, NJ 07458, US, pp.69-70, 1996.
[6] C. H. Dowding, Construction vibrations, Prentice Hall Inc., Upper Saddle River, NJ 07458, US, pp.84, 1996.
[7] 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.