Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Numerical Investigation on End Bearing Capacity of Single Pile Installed in Fractured Rock Mass

절리암반에 설치된 단말뚝기초의 선단지지력에 관한 수치해석 연구

  • Kim, Tae-Jung (Dept. of Mega buildings and bridges, Univ. of Sungkyunkwan) ;
  • Yoo, Chung-Sik (Dept. of Civil Engineering, Univ. of Sungkyunkwan)
  • 김태중 (성균관대학교 초고층.장대교량학과) ;
  • 유충식 (성균관대학교 건설환경시스템공학과)
  • Received : 2012.08.28
  • Accepted : 2013.01.11
  • Published : 2013.01.31
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Abstract

This paper presents the results of a two-dimensional finite element analysis of end bearing capacity of single pile installed in fractured rock mass. A number of cases were analyzed using Hoek-Brown criterion that can consider the condition of rock joints. Considering a wide range of joint conditions in which the pile is embedded into the rock, GSI was set as a main parameter. And the effects of pile diameter, unconfined compressive strength of rock and Hoek-Brown constant $m_0$ were considered. Based on parameter study, end bearing load factor graphs were suggested.

본 연구에서는 2차원 유한차분 해석을 이용하여 절리암반에 시공된 말뚝기초의 선단지지력을 분석하였다. 이를 위해 암반의 절리상태를 고려할 수 있는 Hoek-Brown 항복규준을 이용하여 다양한 조건의 수치해석이 수행되었다. 넓은 범위의 절리상태를 고려하기 위하여 GSI를 주 매개변수로 설정하였고 말뚝 직경, 암반의 일축압축강도, Hoek-Brown 상수 $m_0$의 매개변수 영향을 살펴보았다. 본 연구결과 매개변수들의 변화에 따른 절리 암반에 설치된 말뚝기초의 선단지지력 변화 경향을 확인하였고 이러한 결과를 토대로 매개변수 분석에 따른 선단지지력 결과를 도출하였다.

Keywords

References

  1. ARGEMA(1992), Design guides for offshore structures: offshore pile design, Tirant PL, Paris
  2. Baeg, G. H. and Sa, G. M. (2003), "Assessment of Design Criteria for Bearing Capacity of Rock Socketed Drilled Shaft", Journal of Korean Geotechnical Society (KGS), Vol.19, No.1, pp.37-49.
  3. Carrubba, P.(1997), "Skin friction of large-diameter piles socketed into rock" Canadian Geotechnical Journal, Vol.34, pp.230-240. https://doi.org/10.1139/t96-104
  4. Cho, H. Y., Jung., S. S., and Seol, H. I. (2009), "End Bearing Load Transfer Behavior of Rock Socketed Drilled Shafts", Journal of Korean Geotechnical Society (KGS), Vol.25, No.8, pp.77-93.
  5. Choi, G. N. and Yoo, C. S. (2011), "Numerical Investigation on Load Supporting Mechanism of a Pile Constructed above Underground Cavity", Journal of Korean Geotechnical Society (KGS), Vol.27, No.1, pp.5-16. https://doi.org/10.7843/kgs.2011.27.1.005
  6. Coates, D. F. (1967), Rock mechanics principles. Department of Energy, Mines and Resources, Mines Branch, Queen's printer, Ottawa.
  7. Harberfield, C. M. and Seidel, J. P. (1999), "Some recent advances in the modeling of soft rock joints in direct shear", Geotechnical and Geological Engineering, Vol.17, pp.177-195. https://doi.org/10.1023/A:1008900905076
  8. Hoek, E. and Brown, E. T. (1997), "Practical Estimates of Rock Mass Strength", International Journal of Rock Mechanics and Mining Sciences, Vol.34, No.8, pp.1165-1186. https://doi.org/10.1016/S1365-1609(97)80069-X
  9. Hoek, E., Kaiser, P. K., and Bawden, W. F. (1995), Support of underground excavations in hard rock, A.A. Balkema, Roterdam, pp.215.
  10. Hong, W. P., Yea, G. G., Nam, J. M., and Lee, J. H.(2005), "Settlement Characteristics of Large Drilled Shafts Embedded in Bed Rocks", Journal of Korean Geotechnical Society (KGS), Vol.21, No.5, pp.111-122.
  11. Itasca Consulting Group, Inc. (2011), FLAC, Fast lagrangiananalysis of continua, Ver. 7.0, Vol. I : User's Guide, Minnesota,Itasca Consulting Group, INC.
  12. Logan, D. L. (2007),"A first course in the finite element method, 4th ed." Thomson, pp.361.
  13. Pells P. J. (1977), Theoretical and model studies related to the bearing capacity of rock. Paper presented to Sydney Group of Australian Geomechanics Society
  14. Rowe, R. K. and Armitage, H. H. (1987), "A design method for drilled piers in soft rock", Canadian Geotech Journal, Vol.24, pp.126-142. https://doi.org/10.1139/t87-011
  15. SCJV(2005a), Incheon Bridge project design package No.3 Pile load test report : TP-3 (W8)
  16. SCJV(2005b), Incheon Bridge project design package No.9 Geotechnical investigation report.
  17. Seol, H. I., Jeong, S. S., and Kim, Y. H. (2008), "FE Analysis of Rock-Socketed Drilled Shafts Using Load Transfer Method", Journal of Korean Geotechnical Society (KGS), Vol.24, No.12, pp.33-40.
  18. Serrano, A. and Olalla, C. (2002), "Ultimate bearing capacity at the tip of a pile in rock : part-1 :theory.", International Journal of Rock Mechanics and Mining Sciences, Vol.39, pp.847-866. https://doi.org/10.1016/S1365-1609(02)00053-9
  19. Teng, W. C. (1962), Foundation design, Prentice-Hall, Inc, NJ.
  20. Turner, J. and Ramey, S. (2010), "Base Resistance of drilled shafts in fractured rock", ASCE, The art of foundation engineering practice congress 2010, pp.687-701.
  21. Zhang, L. and Einstein H. (1998), "End bearing capacity of drilled shafts in rock", Journal of Geotechnical and Geoenvironmental Engineering, Vol.124(7), pp.57-58.

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