한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

한국지반공학회 (Korean Geotechnical Society)
권호 표지
DOI QR코드

DOI QR Code

현장 실험을 통한 원형강관 석션관입성 검토

Suction Penetration Review of Circular Steel Pipes by Field Test

  • 김현주 ((주)이피에스엔지니어링) ;
  • 최진오 ((주)이피에스엔지니어링)
  • 투고 : 2020.11.04
  • 심사 : 2020.11.21
  • 발행 : 2020.12.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

현재 국내에서 하천/해상 교량 공사시 교량기초 설치를 위한 가시설로서 원형 단면의 가물막이(cofferdam)를 많이 적용하고 있다. 기존 케이슨(caisson), 시트파일(sheet pile), 셀(cell) 식 등의 가물막이 공법이 많이 활용되고 있으나 이러한 공법은 설치 및 해체시 많은 시간과 비용이 소요된다. 해상공사에서 가장 보편적으로 사용되고 있는 시트파일 공법의 경우 지반 관입에 의한 시트파일 손상과 요소 부재 연결 작업의 어려움으로 내적 및 외적 안정성 확보를 위해 주의가 필요하다. 본 연구에서는 서해안 연약지반을 대상으로 원형강관의 석션관입성 설계를 수행하였고, 현장실험을 통하여 원형강관 석션관입 시공이 가능한 것을 확인하였다. 그리고 표준관입시험(N치) 결과보다 콘관입시험(CPTu)을 이용한 지반 분석 결과를 설계에 적용하는 것이 현장 실험 결과와 보다 유사한 결과를 나타내는 것을 확인하였다. 또한 실트질 사질토 지반에서 상한석션압 이상의 석션압을 적용시 가물막이 내부의 국부적인 파괴(piping 현상)를 유발하는 것을 확인하였다.

Currently, cofferdams of circular cross section are widely applied as temporary facilities for the installation of bridge foundations in river/sea bridge construction in Korea. Existing caisson, sheet pile, and cell type cofferdam are widely used, but these methods take a lot of time and cost for installation and dismantling. In the case of the existing sheet pile construction method, attention is needed to secure internal and external stability because of the damage to the sheet pile due to ground penetration and difficulty in connecting element members. In this study, penetration design of circular steel pipes using suction pressure was performed on the soft ground of the west coast, and it was confirmed that penetration construction using suction pressure was possible through field tests. It was confirmed that applying the ground analysis results using the cone penetration test (CPT) to the design rather than the standard penetration test (N value) results more similar to the field test results. In addition, it was confirmed that local failure of the inside of the cofferdam was induced when a suction pressure higher than the upper limit suction pressure was applied in the silty sand.

키워드

참고문헌

  1. Bang, S., Preber, T., Cho, Y., Thomason, J., Karnoski, S. R., and Taylor, R. J. (2000), Suction Piles or Mooring of Mobile Offshore Bases, Marine Structures, Vol.13, No.5, pp.367-382. https://doi.org/10.1016/S0951-8339(00)00012-5
  2. Coastal Development Institute of Technology (2003), Technicalmanual for suction foundation, Japan Coastal Development Institute of Technology, translated into Korean by Park, W. S., Kwon, O. S., Jang, I. S., and Ahn, H. D. from Korea Ocean Research and Development Institute, 2010.
  3. Dunham, J. W. (1954), Pile Foundation for Buildings, Proc, ASCE, Soil Mechanics and Foundations Division, Vol.80, NO.285.
  4. Houlsby, G.T. and Byrne, B.W. (2005), "Design Procedures for Installation of Suction Caissons in Sand", Proceedings of the Institution of Civil Engineers, Geotechnical Engineering, Vol.158, No.3, pp.135-144. https://doi.org/10.1680/geng.2005.158.3.135
  5. Kim, J.H., Lee, S.T., and Kim, D.S. (2018), "Evaluation of Soil Disturbance Due to Bucket Installation in Sand", Journal of the Korean Geotechnical Society, Vol.34, No.11, pp.21-31 (in Korean). https://doi.org/10.7843/KGS.2018.34.11.21
  6. Kim, J.S. (2019), "Numerical Investigation on Structural Behavior of a Lid with Stiffeners for Suction-installed Cofferdams", Journal of Korean Society of Hazard Mitigation, Vol.20, No.10, pp.7-17 (in Korean).
  7. Kim, J.S., Jeong, Y.J., and Park, M.S. (2019), "Estimation on External Forces Applied to Suction Caisson Using Seepage Analysis", Journal of the Korean Society of Civil Engineers, Vol.39, No.2, pp.317-325 (in Korean). https://doi.org/10.12652/KSCE.2019.39.2.0317
  8. Korea Agency for Insfrastructure Technology Advancement (2015), "Development of a large-diameter steel pipe cofferdam method for the offshore bridge", R&D planning research Report (in Korean).
  9. Robertson, P.K. and Campanella, R.G. (1983a). Interpretation of Cone Penetration Tests-Part I (sand), Canadian Geotechnical Journal, Vol.20, No.4, pp.718-733. https://doi.org/10.1139/t83-078
  10. Steensen-Bach J.D. (1992), "Recent Model Tests with Suction Piles in Clay and Sand", Offshore Technology Conference, Houston, Texas.
  11. Senders, M. and Randolph, M. F. (2009), CPT-based Method for the Installation of Suction Caissons in Sand, Journal of Geotechnical and Geoenvironmental Engineering, American Society of Civil Engineers, Vol.135, No.1, pp.14-25. https://doi.org/10.1061/(ASCE)1090-0241(2009)135:1(14)
  12. Senpere, D. and Auvergne, G.A. (1982), "Suction Anchor Piles - A Proven Alternative to Driving or Drilling", Offshore Technology Conference, Houston, USA, Paper OTC 4206.
  13. Tjelta, T.I. (1995), "Geotechnical Experience from the Installation of the Europipe Jacket with Bucket Foundations", Offshore Technology Conference, Houston, USA, Paper OTC 7795.
  14. Szechy, K. (1966), "The art of tunnelling", Akademiai kiado, Budapest, pp.909-924.
  15. Tran, M.N. and Randolph, M.F. (2008), "Variation of Suction Pressure during Caisson Installation in Sand", Geotechnique, Vol.58, No.1, pp.1-11. https://doi.org/10.1680/geot.2008.58.1.1