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2018 Vol.28, Issue 5 Preview Page
October 2018. pp. 457-475

For increase of reality in numerical analysis, a blasting vibration waveform obtained from field blast operations has been directly used for input parameters of dynamic analysis in the form of vibration velocity. A numerical model was built considering the geological characteristics of underground limestone opening as well as the mining stages in this opening, and the effect of blast operations on stability of underground limestone opening was investigated by dynamic numerical analysis. The adequacy of applying the real vibration waveform to dynamic analysis has been approved from the preliminary analysis, and the dynamic numerical analysis results show that the continuous mining operation can cause the collapse of roof in openings and the active yield zone around openings. Therefore, the additional reinforcements should be applied for ensuring the stability of underground limestone openings.

본 연구에서는 갱내채광장의 발파현상을 보다 현실적으로 수치해석상에서 반영하기 위하여 현장에서의 발파를 통해 획득한 발파진동 파형을 발파지점의 진동속도로 변환하여 이를 동적수치해석의 입력 자료로 직접 활용하였다. 석회석 갱내채광장의 지질특성과 채광단계를 반영한 수치모델을 구성하였으며, 이를 바탕으로 동적수치해석을 수행하여 석회석 갱내광산의 발파작업이 채광장의 안정성에 미치는 영향을 분석하였다. 해석결과와 현장에서 계측된 발파진동의 비교를 통하여 실측발파진동의 적정성을 확인하였으며, 연속되는 채광작업은 응력의 교란에 의한 천반붕락 및 채굴공동 주변의 활동성 파괴영역의 발생을 야기할 수 있는 것으로 분석되었다. 이로부터 연구대상 광산에서의 안정적인 채광활동을 위해서는 추가적인 보강대책이 필요할 것으로 판단된다.

  1. ASTM C 215-02, 2003, Standard test method for fundamental transverse, longitudinal, and torsional resonant frequencies of concrete specimens.
  2. Bieniawski, Z.T., 1989, Engineering rock mass classification, John Wiley & sons, New York, 521.
  3. Chen, S.G. and Zhao, J., 1998, A study of UDEC modelling for blast wave propagation in jointed rock masses, Int. J. Rock Mech. Min. Sci&Geomech. Abstr., 35, 93-99.10.1016/S0148-9062(97)00322-7
  4. Choi, S.O., Park, E.S., Sun, W.C. and Chung, S.K., 2004, A Study on the blasting dynamic analysis using the measurement vibration waveform, Journal of Korean Society for Rock Mechanics, 14, 2, 108-120.
  5. Daesung Mining Development Inc., 2014, Stability evaluation of Donghae mine, Final report.
  6. Hoek, E., Marinos, P. and Benissi, M., 1998, Applicability of the geological strength index(GSI) classification for very weak and sheared rock masses-The case of Athens Schist Formation, Bull Eng. Geol. Env., 57, 151-160.10.1007/s100640050031
  7. Jeon, S.S., Jang, Y.Y. and Jung, D.H., 2007, Estimation of the blasting distance satisfying allowable peak particle velocity-analytical & numerical analysis approach, Journal of Korean Society of Hazard Mitigation, 17, 1, 39-46.
  8. Kim, Y.B., Chung, S.K., Jo, S.H., Kim, C.O. and Um, W.Y., 2015, Hybrid room-and-pillar mining method, Patent No. 1015657890000.
  9. Kwon, M.H., Choi, S.O. and Kim, C.O., 2016, A study on stability analysis of large underground limestone openings considering excavation damaged zone, Journal of Korean Society for Rock Mechanics, 26, 2, 131-142.
  10. National Highway Institute, 1991, U.S. government printing office, Rock blasting and overbreak control, 5.
  11. Park, J.W., Kang, C.W., Go, J.S. and Jang, H.M, 2008, A study on the blasting dynamic analysis using superposition modeling data, Journal of Korean Society for Rock Mechanics, 18, 4, 280-288.
  12. Starfield, A.M. and Pugliese, J.M., 1968, Compression waves generated in rock by cylindrical explosive charges:A comparison between a computer model and field measurements, Int. J. Rock Mech, and Min. Sci. & Geomech. Abstr., 5, 65-77.10.1016/0148-9062(68)90023-5
  13. Winship, B. and Stoneham, S., 1987, Explosive and rock blasting:filed technical operations, Atlas Powder Company, Maple Press company, Dalls, Texas, U.S.A., 321-409.
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 28
  • No :5
  • Pages :457-475
  • Received Date :2018. 10. 05
  • Accepted Date : 2018. 10. 26