Browse > Article
http://dx.doi.org/10.12989/sem.2017.62.4.381

Advanced procedure for estimation of pipeline embedment on soft clay seabed  

Yu, S.Y. (Ocean and Ship Technology, Deepwater Technology Mission Oriented Research, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS)
Choi, H.S. (Graduate School of Engineering Mastership, Pohang University of Science and Technology)
Park, K.S. (Steel Structure Research Group, POSCO Global R&D Center)
Kim, Y.T. (Environmental and Plant Engineering Research Team, Daewoo Institute of Construction Technology)
Kim, D.K. (Ocean and Ship Technology, Deepwater Technology Mission Oriented Research, Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS)
Publication Information
Structural Engineering and Mechanics / v.62, no.4, 2017 , pp. 381-389 More about this Journal
Abstract
In the present study, the advanced procedure has been proposed to estimate higher accuracy of embedment of pipes that are installed on soft clay seabed. Numerical simulation by OrcaFlex simulation code was performed to investigate dynamic seabed embedment, and two steps, i.e., static and dynamic analysis, were adopted. In total, four empirical curves were developed to estimate the seabed embedment including dynamic phenomena, i.e., behaviour of vessel, environmental condition, and behaviour of nonlinear soil. The obtained results were compared with existing methods (named general method) such as design code or guideline to examine the difference of seabed embedment for existing and advance methods. Once this process was carried out for each case, a diagram for estimating seabed embedment was established. The applicability of the proposed method was verified through applied examples with field survey data. This method will be very useful in predicting seabed embedment on soft clay, and the structural behaviours of installed subsea pipelines can be changed by the obtained seabed embedment in association with on-bottom stability, free span, and many others.
Keywords
seabed embedment; soft clay; dynamic installation; dynamic environment; pipe-soil interaction;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Aubeny, C.P., Biscontin, G. and Zhang, J. (2006), Seafloor interaction with steel catenary risers. Final project report (Number: 510, Task order: 35988), Texas A&M University, Houston, TX, USA.
2 Bruton, D., White, D., Cheuk, C., Bolton, M. and Carr, M. (2006), "Pipe-soil interaction behavior during lateral buckling, including large amplitude cyclic displacement tests by the safebuck JIP", The 38th Offshore Technology Conference (OTC 2006), May 1-4, Houston, TX, USA (OTC-17944).
3 Dingle, H.R.C., White, D.J. and Gaudin, C. (2008), "Mechanisms of pipe embedment and lateral breakout in soft clay", Can. Geotech. J., 45(5), 636-652.   DOI
4 DNV (2010), Recommended Practice F109: On-bottom stability design of Submarine Pipelines, Det Norske Veritas, Oslo, Norway.
5 DNV (2006), Recommended Practice F105: Free Spanning Pipelines, Det Norske Veritas, Oslo, Norway.
6 Elosta, H., Huang, S. and Incecik, A. (2013), "Dynamic response of steel catenary riser using a seabed interaction under random loads", Ocean Eng, 69(1), 34-43.   DOI
7 Kim, Y.T., Kim, D.K., Choi, H.S., Yu, S.Y. and Park, K.S. (2017), "Fatigue performance of deepwater steel catenary riser considering nonlinear soil", Struct. Eng. Mech., 61(6), 737-746.   DOI
8 Lund, K.M. (2000), "Effect of increase in pipeline soil penetration from installation", The 19th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2000), February 14-17, New Orleans, USA (OMAE2000-PIPE5047).
9 Merifield, R.S., White, D.J. and Randolph, M.F. (2008), "The ultimate undrained resistance of partially embedded pipelines", Geotechnique, 58(6), 461-470.   DOI
10 Merifield, R.S., White, D.J. and Randolph M.F. (2009), "Effect of surface heave on response of partially embedded pipelines on clay", J. Geotech. Geoenviron. Eng., 135(6), 819-829.   DOI
11 NAVO (2013), "Database description for bottom sediment type", Mississippi (USA): Naval Oceanographic Office, Acoustics Division, Stennis Space Center (www.oc.nps.edu/-bird/oc2930/sediments).
12 Sun, J., Chang, G.A. and Liu, X. (2013), "On the prediction of pipeline as-laid embedment using a cycle by cycle approach for deepwater application", The 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013), June 9-14, Nantes, France (OMAE2013-10485).
13 OrcaFlex (2013), User's manual version 9.6C, Orcina Ltd., Daltongate, Ulverston, Cumbria, UK (www.orcina.com).
14 Palmer, A. (2008), "Touchdown indentation of the seabed", Appl. Ocean Res., 30(3), 235-238.   DOI
15 Randolph, M.F. and Quiggin, P. (2009), "Non-linear hysteretic seabed model for catenary pipeline contact", The 28th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2009), May 31-June 5, Honolulu, USA (OMAE2009-79259).
16 Verley, R.L.P. and Lund, K.M. (1995), "A soil resistance model for pipelines placed on clay soils", The 14th International Conference on Offshore Mechanics and Arctic Engineering (OMAE 1995), June 18-22, Copenhagen, Denmark.
17 Wang, D., White, D.J. and Randolph, M.F. (2009), "Numerical simulations of dynamic embedment during pipe laying on soft clay", The 28th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2009), May 31-June 5, Honolulu, USA (OMAE2009-79119).
18 White, D.J., Gaudin, C., Boylan, N. and Zhou, H. (2010), "Interpretation of T-bar penetrometer tests as shallow embedment and in very soft clay", Can. Geotech. J., 47(2), 218-229.   DOI
19 Yu, S.Y., Choi, H.S., Lee, S.K., Do, C.H. and Kim, D.K. (2013), "An optimum design of on-bottom stability of offshore pipelines on soft clay", Int. J. Naval Arch. Ocean Eng., 5(4), 598-613.   DOI
20 Yu, S.Y. (2014), On-bottom stability of offshore pipeline considering dynamic embedment on soft clay, Ph.D. Dissertation, Pusan National University, Busan, Republic of Korea.
21 Yu, S.Y., Choi, H.S., Lee, S.K., Park, K.S. and Kim, D.K. (2015), "Nonlinear soil parameter effects on dynamic embedment of offshore pipeline on soft clay", Int. J. Naval Arch. Ocean Eng., 7(2), 227-243   DOI
22 Zhou, H., White, D.J. and Randolph, M.F. (2008), "Physical and numerical simulation of shallow penetration of a cylindrical object into soft clay", International Conference on GeoCongress 2008: Characterization, Monitoring, and Modeling of GeoSystems, March 9-12, New Orleans, LA, USA (http://dx.doi.org/10.1061/40972(311)14).   DOI