한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

한국지반공학회 (Korean Geotechnical Society)
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소일-시멘트 파일을 이용한 항만구조물의 말뚝식 지반개량 적용성

Application of Soil-Cement Piles to the Ground Improvement of Harbor Structures

  • 이성훈 ((주)대영엔지니어링 지반공학부) ;
  • 권오엽 (건국대학교 토목공학과) ;
  • 신종호 (건국대학교 토목공학과)
  • 투고 : 2013.06.11
  • 심사 : 2013.11.12
  • 발행 : 2013.11.30
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초록

본 연구에서는 항만구조물 기초지반에 소일-시멘트 파일을 이용한 말뚝식 지반개량을 적용한 90개 단면에 대해 안정검토를 수행하였고, 수치해석을 포함한 모든 항목에서 안정한 단면별 최소치환율을 결정하였으며, 원심모형실험을 통해 수치해석 결과의 신뢰성을 검증하였다. 연구결과, 기초지반이 매우 연약($s_u$ =15kPa이하)한 경우에는 말뚝식 지반개량이 부적합하고, 항만구조물의 말뚝식 지반개량에는 기초지반과 개량체의 강성비(n)가 최대 50~75이하이고 개량체 강도가 2~3MPa인 소일-시멘트 파일공법이 가장 적합하며, 최소치환율 지배인자가 허용수평변위이므로 말뚝식 지반개량을 설계할 때는 반드시 수평변위를 검토해야 하는 것으로 나타났다.

This study undertook research on the sections of 90 harbor structures which applied a pile-type soil improvement using the soil-cement pile and then, determined the minimum replacement rate for each section, showing sufficient stability in all relevant studies including numerical analysis. The reliability of the numerical analysis was verified by a centrifuge model test. As a result of the study, it was revealed that when the foundation soil is too soft ($s_u$ = under 15 kPa), it is unsuitable to apply a pile-type ground improvement to a soil improvement regardless of types of super structures. And a pile-type soil improvement was found to be suitable for a harbor structure with the relative stiffness ratio (n) of less than 50~75 at a maximum and the 2~3 MPa strength of the soil-cement pile. Furthermore the governing factor for the minimum replacement rate for the pile-type soil improvement was turned out to be the allowable horizontal displacement. Therefore, the primary review to see the applicability of the pile-type soil improvement requires the evaluation of horizontal displacements.

키워드

참고문헌

  1. C.D.I.T. (2008), CDM technical manual at offshore construction (revised edition), p.158. Japan.
  2. Chun, B. S. (2011), Principal and practice for chemical grouting, pp.315-338, Goomibook.
  3. Geotechnical Engineering Lab. (2011), "Evaluation report on the stability of breakwater structures (for Ulsan New Port breakwater)", pp.25-35. Gangwon National University.
  4. Han, C. W. (2007), "A Study on Soil Improvement by Using High Pressure Grouting", Gyeongsang National University.
  5. Han, J., Parsons, R. L., Haung, J., and Sheth, A. R. (2005), "Factors of safety against deep-seated failure of embankments over deep mixed columns", Proc. Int. Conf. Deep Mixing-Best Practice and Recent Advances, 1.2, pp.231-236.
  6. Hong, W. P., Yun, J. M., and Kim, D. W. (1997), "Mechanical Property of the Ground Improved by High Pressure Jet-Grouting", Journal of the Korean Society of Civil Engineers, Vol.17, Issue 3_4, pp.415-423.
  7. Jo, J. B. (2012), "An Analytical Study on the Stability of Revetment on Soft Ground Reinforced by DMM", Changwon National University.
  8. Kang, S. H. (1995), "An Eeperimental Study on the Improvement of Ground Reinforcement Effect of Cement Grouting in Marine Clay", Hanyang University.
  9. Kim, D. W. (1995), "Mechanical Property of the Ground Improved by Jet Grouting", Chung-Ang University.
  10. Kim, M. S. (2000), "A Study on the Effect of Ground Improvement by High Pressure Jet Grouting", Seoul National University of Science & Technology.
  11. Kim, S. K. (2007), "A Study on Engineering Characteristics of Soil-Cement", Chonnam National University.
  12. Kim, Y. U., Kim, B. I., and Xiaohong, B. (2003), "Behaviors of Soil-cement Piles in Soft Ground", Journal of Korean Geotechnical Society, Vol.19, No.3, pp.45-51.
  13. Korean Geotechnical Society (2003), Geotechnical Engineering Series No.1, pp.312-317, Goomibook.
  14. Lee, C. J. (2002), "Introduction of Geotechnical Centrifuge Technology", Journal of Korean Geotechnical Society, Vol.18, No.8, pp.31-37.
  15. Lee, S. W. (1991), "A Study on Effect of Soil Improvement by Jet Grouting", Hanyang University.
  16. Masaki Kitazume and Kenji Maruyama (2006), "External stability of group column type deep mixing improved ground under embankment loading", Soils & Foundations, Vol.46, No.3, pp.323-340. https://doi.org/10.3208/sandf.46.323
  17. Masaki Kitazume and Kenji Maruyama (2007), "Internal stability of group column type deep mixing improved ground under embankment loading", Soils & Foundations, Vol.47, No.3, pp.437-455. https://doi.org/10.3208/sandf.47.437
  18. M.O.F. (2005), Design Code for Port & Harbor Facilities, pp. 226-288, 557-567. Korea.
  19. Navin, M. P., Kim, M., and Filz, G. M. (2005), "Stability of embankments founded on deep-mixing-method columns : three-dimensional considerations", Proc. 16th ICSMFE, 3, pp.1227-1230.
  20. Oh, K. (2007), "A Study for the In-Situ Application of the Improved Materials by Mortar Jet Method", Hanyang University.
  21. P.W.R.C. (2004), CDM design & construction manual at onshore construction, pp.75-91. Japan.
  22. Rampello, S. and Callisto, L. (2003), "Predicted and observed performance of an oil tank founded on soil-cement columns in clayey soils", Soils & Foundations, 43(4), pp.229-241. https://doi.org/10.3208/sandf.43.4_229