Browse > Article
http://dx.doi.org/10.9711/KTAJ.2013.15.1.049

Effects of free surface using waterjet cutting for rock blasting excavation  

Oh, Tae-Min (KAIST, Department of Civil & Environmental Engineering)
Cho, Gye-Chun (KAIST, Department of Civil & Environmental Engineering)
Ji, In-Taeg (Smart EnC.)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.15, no.1, 2013 , pp. 49-57 More about this Journal
Abstract
The conventional blasting method generates serious blasting vibration and underbreak/overbreak in spite of its high efficiency for rock excavation. To overcome these disadvantages, this paper introduces an alternative excavation method that combines the conventional blasting process with the free surface on the perimeter of the tunnel face using waterjet cutting technology. This proposed excavation method has advantages of (1) reducing vibration and noise level; (2) minimizing underbreak and overbreak; and (3) maximizing excavation efficiency. To verify the effects of the proposed excavation method, field tests were performed with a smooth blasting method at the same excavation conditions. Test results show that the vibration is reduced by up to 55% and little underbreak/overbreak is generated compared with the smooth blasting method. In addition, the excavation efficiency of the proposed method is greater than that of the smooth blasting method. The proposed blasting method with a free surface using waterjet cutting can be applied to urban excavation construction as well as to underground structure construction.
Keywords
Waterjet; Blasting method; Rock excavation; Free surface; Waterjet cutting;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Berta, G. (1994), "Blasting-induced vibration in tunnelling", Tunnelling and Underground Space Technology, Vol. 9, No. 2, pp. 175-187.   DOI   ScienceOn
2 Hwang, H., Lee, T.R. (2002), "A study on pilot test of the composition presplitting angle cut method in tunnel blasting", Journal of the Korean Tunnelling and Underground Space Association, Vol. 4, No. 4, pp. 287-300.
3 Kim, J.G. (2012), "Reduction of blasting-induced vibration in tunnelling using abrasive water jet notch and disc cutting", Ph.D. Dissertation, Seoul National University. pp. 57-62.
4 Lee, I.M. (2007), Geotechnical Fundamentals of Tunnel, Saeron Publishing Co., pp. 279-281.
5 Oh, T.M., Cho, G.C., Song, K.I., Ji, I.T. (2012), "A new rock excavation method using an abrasive waterjet to minimized excavation damaged zone", Proceedings of World Tunnel Congress 2012, Bangkok, Thailand, pp. 340-341.
6 Oh, T.M., Cho, G.C. (2012), "Effects of geometric parameters of a combined nozzle for rock cutting using an abrasive waterjet", Journal of the Korean Tunnelling and Underground Space Association, Vol. 14, No. 5, pp. 517-528.   과학기술학회마을   DOI   ScienceOn
7 Park, D.H., Jeon, B.K., Jeon S.W. (2009), "A numerical study on the screening of blast-induced waves for reducing ground vibration", Rock Mechanics and Rock Engineering, Vol. 42, pp. 449-473.   DOI   ScienceOn
8 Richart, F.E., Hall, J.R., Woods, R.D. (1970), Vibration of Soils and Foundations, Prentice-Hall, New Jersey, pp. 247-262.
9 Santamarina J.C., Klein K.A., Fam M.A. (2001), Soils and Waves, Wiley, New York, pp. 195-200.
10 Shin, J.H., Moon, H.K., Choi, K.C., Kim, T.K. (2009), "Evaluation of the blast-restriction zone to secure tunnel lining safety", Journal of the Korean Tunnelling and Underground Space Association, Vol. 11, No. 1, pp. 85-95.   과학기술학회마을
11 Uysal, O., Erarslan, K., Cebi, M.A., Akcakoca, H. (2008), "Effect of barrier holes on blast induced vibration", Journal of Rock Mechanics and Mining Sciences, Vol. 45, No. 5, pp. 712-719.   DOI   ScienceOn