화약ㆍ발파 (Explosives and Blasting)

대한화약발파공학회 (Korean Society of Explosives and Blasting Engineering)
권호 표지

석회석 파쇄도 향상을 위한 발파 설계

Blast Design for Improvement of Limestone Fragmentation

  • 피유시 라이 (Banaras 대학 광산공학과, 전남대학교 에너지자원공학과) ;
  • 양형식 (전남대학교 에너지자원공학과)
  • Piyush, Rai (Dept. of Energy & Resources Eng., Chonnam National University, Dept. of Mining Eng., Banaras Hindu University) ;
  • Yang, Hyung-Sik (Dept. of Energy & Resources Eng., Chonnam National University)
  • 투고 : 2010.05.26
  • 심사 : 2010.06.21
  • 발행 : 2010.06.30
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초록

이 논문은 필리핀 석회석 광산에 적용한 연구 결과로서 이 광산에서는 파쇄석 입도분포가 좋지 않고 벽면의 유지나 파쇄석 더미의 분산이 불량하였다. 기폭패턴을 대각선 방식에서 V 타입으로 바꾸고 전색장을 조정하여 저항과 가스압의 유지기간을 향상시켰다. 이를 통하여 발파결과가 향상되었다. 특히 공당발파영역이 넓어진 것으로써 그 성과를 확인할 수 있다. 공당발파영역은 기존의 $8.96m^2$에서 $12m^2$로 넓어졌다. 화약계수는 증가하였고 대괴의 수는 감소하였으며, 전방적재기의 행정시간이 감소하였다. 또 공전 시간이 줄었으며 적재높이가 향상되었다.

The paper presents a case study of a limestone quarry of the Philippines, where major problems in terms of improper fragmentation, poor wall control, and poor heave of the muck pile were witnessed. The paper highlights the significant role of switching over from diagonal firing pattern to V-type firing pattern, and also of making suitable adjustments in the stemming column length for improved confinement and gas retention. The study revealed that by making aforesaid design modifications in the blast round, marked improvement in blasting results was registered. Looking at the results, it was further contemplated to expand the mesh area in the subsequent blast rounds. The mesh area was incremented from the existing $8.96m^2$ to $12m^2$. The results were meticulously registered in the field, and clearly depicted definite improvements in the blast results in terms of increased P.F., reduced boulder count, reduced FEL cycle time, reduced dozing hours and improved heave.

키워드

참고문헌

  1. Ash, R.L., 1973, The influence of geological discontinuities on rock blasting, Ph.D. thesis, Univ. of Missouri, Missouri, USA.
  2. Brinkmann, J.R., 1990, An experimental study of the effects of shock and gas penetration in blasting, Proc. 3rd Int. Symp. on Rock Fragmentation by Blasting, Brisbane, Australia, pp. 55-66.
  3. Chiapetta, R.F. and J.L. Wyciskalla, 2004, Bottom-hole and multiple power decks, Quarry Management Journal, pp. 21-30.
  4. Floyd, J.L., 1999, Explosive energy relief -The key to controlling over break, Proc. Int. Conf. Explo '99, AusIMM, Kalgoorlie, WA, pp. 147-153.
  5. Hagan, T.N., 1983, The influence of controllable blast parameters on fragmentation and mining costs, Proc. 1st Int. Symp. on Rock Fragmentation by Blasting, Lulea, Sweden, pp. 31-51.
  6. Kanchibotla, SS., 2001, Optimum blasting? Is it minimum cost per broken rock or maximum value per broken rock?, Proc. Explo-2001, AusIMM, Hunter valley NSW, pp. 35-40.
  7. Konya, C.J., 1996, Problems with deck loaded blast holes, E&MJ, pp. 73-74.
  8. Marton, A. and R. Crookes, 2000, A case study in optimizing fragmentation, The Aus. IMM Proc. No.1, pp. 35-43.
  9. Mclonghlin, M., 2004, Softly softly, World Mining Equipment, Vol. 28, No. 1, pp. 33-34.
  10. Oliver, P.H., 2003, Changes to drill pattern and adequate inter-row delay time improve blasting performance, CIM Bulletin, Vol. 96, pp. 60-65.
  11. Rai, P. and S.S. Baghel, 2004, Investigation of patterns on fragmentation in an Indian opencast limestone mine, Quarry Management Journal, pp. 21-30.
  12. Rai, P., 2003, Change that blast, World Mining Equipment, Vol. 27, No. 9, pp. 43-45.
  13. Rai, P., 2002, Evaluation of effect of some blast design parameters on fragmentation in opencast mine, Ph.D. thesis, Banaras Hindu University, Varanasi, India.
  14. Rzhevsky, V.V., 1985, Opencast mining unit operations, Mir Publishers, Moscow, 1985.
  15. Singh, S.P. and T. Yalcin, 2002, Effect of muck size distribution on scooping operations, J. Int. Soc. Explosive Engineers., V.1, pp. 315-325.
  16. Smith, N.S., 1976, Burden rock stiffness and its effects on fragmentation in bench blasting, Ph.D. thesis, Univ. of Missouri, USA.