International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

An optimum design of on-bottom stability of offshore pipelines on soft clay

  • Yu, Su Young (Graduate School of Engineering Mastership, Pohang University of Science and Technology) ;
  • Choi, Han Suk (Graduate School of Engineering Mastership, Pohang University of Science and Technology) ;
  • Lee, Seung Keon (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Do, Chang Ho (Hyundai Heavy Industries, Co., Ltd.) ;
  • Kim, Do Kyun (Graduate School of Engineering Mastership, Pohang University of Science and Technology)
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

This paper deals with the dynamic effect of pipeline installation and embedment for the on-bottom stability design of offshore pipelines on soft clay. On-bottom stability analysis of offshore pipelines on soft clay by DNV-RP-F109 (DNV, 2010) results in very unreasonable pipe embedment and concrete coating thickness. Thus, a new procedure of the on-bottom stability analysis was established considering dynamic effects of pipeline installation and pipe-soil interaction at touchdown point (TDP). This analysis procedure is composed of three steps: global pipeline installation analysis, local analysis at TDP, modified on-bottom stability analysis using DNV-RP-F109. Data obtained from the dynamic pipeline installation analysis were utilized for the finite element analysis (FEA) of the pipeline embedment using the non-linear soil property. From the analysis results of the proposed procedure, an optimum design of on-bottom stability of offshore pipeline on soft clay can be achieved. This procedure and result will be useful to assess the on-bottom stability analysis of offshore pipelines on soft clay. The analysis results were justified by an offshore field inspection.

Keywords

References

  1. Abaqus, 2011. CAE 6.11-1 User's manual. Dassault Systemes Americas Corp., Waltham, MA, USA [Online] Available at:
  2. Bai, Y. and Bai, Q., 2005. Subsea pipelines and risers. Oxford: Elsevier Ltd.
  3. Chatterjee, S., Randolph, M.F., White, D.J. and Wang, D., 2011. Large deformation finite element analysis of vertical penetration of pipelines into the seabed. Proceedings of the 2nd International Symposium on Frontiers in Offshore Geotechnics, Perth, Australia, pp.785-790.
  4. DNV, 2010. On-bottom stability design of submarine pipelines. Recommended Practice. DNV-RP-F109. Oslo: Det Norske Veritas.
  5. DNV, 2011. On-bottom stability assessment of pipeline on clayed soil due to the effect of dynamic motion. Report of SHWE field development project (SHG-PL-EC-304-0006). Oslo: Det Norske Veritas.
  6. DNV, 2012. Submarine pipeline systems. DNV-OS-F101. Oslo: Det Norske Veritas.
  7. Einav, I. and Randolph, M.F., 2005. Combining upper bound and strain path methods for evaluating penetration resistance. International Journal for Numerical Methods in Engineering, 63(14), pp.1991-2016. https://doi.org/10.1002/nme.1350
  8. Fang. I., Cheng, F., Incecik, A. and Carnie, P., 2013. Global marine trends 2030. Lloyd's Register, London: QinetiQ and University of Strathclyde.
  9. Fugro Survey, 2012. SHWE Field Development Project As-laid Survey, Report of SHWE field development project (H-2639/2012/01 Rev.0), Singapore; FUGRI SURVEY LTD.
  10. Guo, B., Song, S., Chacko, J. and Ghalambor, A., 2004. Offshore pipelines. Burlington, MA: Gulf Professional Publishing.
  11. Merifield, R.S., White, D.J. and Randolph, M.F., 2009. Effect of surface heave on response of partially embedded pipelines on clay. Journal of Geotechnical and Geoenvironmental Engineering, 135(6), pp.819-829. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000070
  12. OFFPIPE, 2013. User's guide version 3.0 by Robert C. Malahy, Jr. (RCM). Houston, USA. [Online] Available at: .
  13. Randolph, M.F. and White, D.J., 2008a. Pipeline embedment in deepwater: processes and quantitative assessment. The 39th Offshore Technology Conference (OTC), Houston, TX, USA (OTC 19128), May 5-8 2008.
  14. Randolph, M.F. and White, D.J., 2008b. Upper bound yield envelopes for pipelines at shallow embedment in clay. Geotechnique, 58(4), pp.297-301. https://doi.org/10.1680/geot.2008.58.4.297
  15. Taiebat, H.A. and Carter, J.P., 2008. Flow rule effects in the Tresca model. Computers and Geotechnics, 35(3), pp.500-503. https://doi.org/10.1016/j.compgeo.2007.06.012
  16. Verley, R.L.P. and Lund, K.M., 1995. A soil resistance model for pipeline placed on clay soils. Proceedings of International Conference on Offshore Mechanics and Arctic Engineering (OMAE), 5(A), pp.225-232.
  17. Wang, D., White, D.J. and Randolph, M.F., 2009. Numerical simulation of dynamic embedment during pipe laying on soft clay. Proceedings of International Conference on Offshore Mechanics and Arctic Engineering (OMAE), 3, pp.119-127.
  18. White, D.J. and Cheuk, C.Y., 2008. Modelling the soil resistance on seabed pipelines during large cycles of lateral movement. Marine Structures, 21(1), pp.59-79. https://doi.org/10.1016/j.marstruc.2007.05.001
  19. Zhou, H. and Randolph, M.F., 2007. Computational techniques and shear band development for cylindrical and spherical penetrometers in strain-softening clay. International Journal of Geomechanics, 7(4), pp.287-295. https://doi.org/10.1061/(ASCE)1532-3641(2007)7:4(287)