터널과지하공간 (Tunnel and Underground Space)

  • 제23권1호
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  • Pages.42-53
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  • 2013
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  • 1225-1275(pISSN)
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  • 2287-1748(eISSN)
한국암반공학회 (Korean Society for Rock Mechanics and Rock Engineering)
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홉킨스바 타격시험을 통한 드릴비트의 암반파쇄 분석

Rock Fragmentation Assessment of a Drill Bit by Hopkinson Bar Percussion Test

  • 권기범 (한국생산기술연구원 건설기계부품연구그룹) ;
  • 송창헌 (한국생산기술연구원 건설기계부품연구그룹) ;
  • 박진영 (한국생산기술연구원 건설기계부품연구그룹) ;
  • 신대영 (한국생산기술연구원, 대경본부) ;
  • 조정우 (한국생산기술연구원 건설기계부품연구그룹) ;
  • 조상호 (전북대학교 자원.에너지공학과)
  • Kwon, Ki-Beom (Construction Equipment and Parts R&D Group, Korea Institute of Industrial Technology) ;
  • Song, Chang-Heon (Construction Equipment and Parts R&D Group, Korea Institute of Industrial Technology) ;
  • Park, Jin-Young (Construction Equipment and Parts R&D Group, Korea Institute of Industrial Technology) ;
  • Shin, Dae-Young ;
  • Cho, Jung-Woo (Construction Equipment and Parts R&D Group, Korea Institute of Industrial Technology) ;
  • Cho, Sang-Ho
  • 투고 : 2013.01.09
  • 심사 : 2013.02.18
  • 발행 : 2013.02.28
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초록

천공 작업 시 드릴비트 버튼의 타격 속도와 타격 간격은 천공효율을 높이는데 있어 매우 중요한 요소이다. 따라서 본 연구에서는 버튼의 타격 속도 및 간격에 따른 암반 파쇄성능을 분석하기 위하여 홉킨스바 시험기를 이용한 타격시험을 수행하였다. 먼저, 버튼의 타격속도에 따른 암석파쇄 현상을 분석하기 위하여 단일타격 시험을 수행하였고, 수치해석을 통해 단일 타격 시험에 대한 암석의 파쇄과정을 모사하였다. 다음으로 버튼의 타격 간격에 따른 천공효율을 예측하기 위하여 타격 후 설정된 거리만큼 암석 시료를 이동시키고 재차 타격하는 방식으로 다중타격 시험을 수행하였다. 타격시험 후 암석의 천공부피는 레이저 스캐너를 이용하여 측정하였으며, 타격에너지와 천공부피를 통해 천공성능을 계산하였다. 이러한 시험 결과를 바탕으로 직경 102 mm 드릴비트의 1회 타격 시 천공성능을 예측하였다.

The percussion rate and spacing of the button of drill bit are very important in maximizing the drilling efficiency. Therefore, a series of percussion tests using Hopkinson bar system was carried out to assess the fragmentation performance against the beat rate and spacing of a drill bit. First, single percussion test complemented with numerical simulation was performed to analyze rock fragmentation phenomenon and to describe the fragmentation process. Next, multiple percussion test that repetitively strike the rock sample moving at predetermined rate was carried out to predict drilling efficiency against the button spacing. After the tests, the fragmented volume of the rock was measured by laser scanner and the drilling performance was analyzed using the calculated percussive energy and measured negative volume. Based on the results, the single impact performance of drill bit with 102 mm diameter was predicted.

키워드

참고문헌

  1. Atlas Copco, 2006, Surface Drilling in Quarry and Construction.
  2. Bu, C., Qu, Y., Cheng, Z., Liu, B., 2009, Numerical simulation of impact on pneumatic DTH hammer percussive drilling, Journal of Earth Science, 20.5, 868-878. https://doi.org/10.1007/s12583-009-0073-5
  3. Century Dynamics Inc., 2003, AUTODYN Theory Manual, Concord, California, USA.
  4. Cho, J.-W., Jeon, S., Yu, S.-H., and Chang, S.-H., 2010, Optimum spacing of TBM disc cutters: A numerical simulation using the three-dimensional dynamic fracturing method, Tunnelling and Underground Space Technology, Vol. 25, No. 3, 230-244. https://doi.org/10.1016/j.tust.2009.11.007
  5. Choi, M. J., Cho, S. H., Yang, H. S., 2008, A Study on dynamic Fracturing Behavior of Anisotropic Granite by SHPB Test, Tunnel & Underground Space, Vol. 18, No. 3, 241-218.
  6. Hustruid, W.A. and Fairhurst, C., 1971(a), A theoretical and experimental study of the percussive drilling of rock, Part I - Theory of percussive drilling, Int. J. Rock Mech. Min. Sci. Vol. 8, 311-333. https://doi.org/10.1016/0148-9062(71)90045-3
  7. Hustruid, W.A. and Fairhurst, C., 1971(b), A theoretical and experimental study of the percussive drilling of rock, PART II - Force-penetration and specific energy determinations, Int. J. Rock Mech. Min. Sci. Vol. 8, 335-356. https://doi.org/10.1016/0148-9062(71)90046-5
  8. Hustruid, W.A. and Fairhurst, C., 1972(a), A theoretical and experimental study of the percussive drilling of rock, PART III - Experimental verification of the mathematical theory, Int. J. Rock Mech. Min. Sci. Vol. 9, 417-429. https://doi.org/10.1016/0148-9062(72)90006-X
  9. Hustruid, W.A. and Fairhurst, C., 1972(b) A theoretical and experimental study of the percussive drilling of rock, PART IV - Application of the model to actual percussion drilling, Int. J. Rock Mech. Min. Sci. Vol. 9, 431-449. https://doi.org/10.1016/0148-9062(72)90007-1
  10. Jeong, H. Y., Jeon, S. W., Cho, J. W., 2012, A Study on Punch Penetration Test for Performance Estimation of Tunnel Boring Machine, Tunnel & Underground Space, Vol. 22, No. 2, 144-156. https://doi.org/10.7474/TUS.2012.22.2.144
  11. Kim, K. Y., Kim, C. Y., Kim, K.-S., 2008, Assessment of Hydraulic Drilling Data on Homogeneous Rock Mass, Tunnel & Underground Space, Vol. 18, No. 6, 480-490
  12. LDI Ltd, 2012, 3D Laser Scanner catalog: RPS LASER PROBES (on website).
  13. Oh, J. Y., Lee, G. H., Song, C. S., 2011, A Study on the Analysis of Hydraulic Circuit of a Rockdrill Drifter, The Korea Fluid Power System Society, Proceeding of the KFPS 2011 Spring Conference, 70-75.
  14. Shin, D. Y., Song, C. H., 2012, Performance Optimization of Down-the-Hole Hammer Using Taguchi Method, Journal of the Korean Society of Mechanical Engineers-A, Vol. 36, No. 1, 109-116. https://doi.org/10.3795/KSME-A.2012.36.1.109
  15. Song, C. H., Kwon, K. B., Park, J. Y., Shin, D. Y., Cho, J. W., 2012, Optimization of Flow Path of Drill Bit Using CFD Simulation, Tunnel & Underground Space, Vol. 22, No. 4, 257-265. https://doi.org/10.7474/TUS.2012.22.4.257
  16. Yang, J. H., Ahn, J. L., Kim, S. K., Song, Y. S., Sung, N. H., Lee, Y. K., Cho, S. H., 2011, Estimation of Dynamic Brazilian Tensile Strengths of Rocks Using Split Hopkinson Pressure Bar (SHPB) System, Tunnel & Underground Space, Vol. 21, No.2, 109-116

피인용 문헌

  1. Trend Analysis of Drilling Technology for Top-Hammer Drilling Machine vol.23, pp.4, 2013, https://doi.org/10.7474/TUS.2013.23.4.271
  2. Evaluation of drilling efficiency by percussion testing of a drill bit with new button arrangement vol.15, pp.6, 2014, https://doi.org/10.1007/s12541-014-0437-3
  3. Development of lab-scale rock drill apparatus for testing performance of a drill bit vol.16, pp.7, 2015, https://doi.org/10.1007/s12541-015-0185-z
  4. Optimum operating conditions of a multi-hammer drilling machine assessed using a linear percussion test vol.16, pp.7, 2015, https://doi.org/10.1007/s12541-015-0186-y
  5. Evaluation of a Drill Bit Button Arrangement for Enhanced Drilling Efficiency vol.39, pp.6, 2015, https://doi.org/10.3795/KSME-A.2015.39.6.575
  6. Optimal button arrangement of a percussion drill bit and its operating condition for improving drilling efficiency pp.2041-2983, 2018, https://doi.org/10.1177/0954406217726563