A Toolbox for Optimizing Geotechnical Design of Subsea Foundations
- S. M. Gourvenec (University of Western Australia) | X. Feng (University of Western Australia) | M. F. Randolph (University of Western Australia) | D. J. White (University of Western Australia)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 1-4 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2017. Offshore Technology Conference
- 1.2.3 Rock properties
- optimization, subsea foundations
- 2 in the last 30 days
- 144 since 2007
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This paper presents a toolbox for optimizing geotechnical design of subsea foundations. The geotechnical design challenge of subsea shallow foundations is to withstand greater dead and operational loads on soft seabeds without increasing the footprint size or weight. The motivation is to reduce costs associated with installation – for example eliminating the need for a heavy-lift vessel to place foundation units alone if handling limits of pipe-laying vessels are exceeded – whilst providing acceptable in-service reliability. The tools presented focus on prediction of undrained seabed response and are intended for deep water developments on fine grained seabeds, as this scenario presents a significant challenge in terms of minimizing subsea foundation footprints. The toolbox addresses optimization of geotechnical subsea foundation performance through four aspects: (i) optimizing the analysis methodology, (ii) modifying the foundation configuration, (iii) improving the site characterisation data as input to the design, and (iv) altering the basis of design. The research presented derives from a combination of physical model testing in a geotechnical centrifuge, numerical analysis and theoretical modelling. The methods, procedures and processes are presented in terms of design equations, theoretical frameworks or design charts, many of which are freely available as web-based applications. Worked examples throughout the paper demonstrate the efficiencies in terms of footprint area to be realized through adoption of these tools.
|File Size||4 MB||Number of Pages||39|
Acosta-Martinez, H.E., Gourvenec, S. & Randolph, M.F. (2012). Centrifuge study of undrained capacity of a skirted foundation under eccentric transient and sustained uplift loading. Géotechnique, 62(4): 317&-328. 10.1680/geot.9.P.027.
Chatterjee, S., Gourvenec, S. & White D.J. (2014). Assessment of the consolidated breakout response of partially embedded seabed pipelines. Géotechnique, 10.1680/geot.13.P.215. 64(5): 391&-399.
Cocjin, M, Gourvenec, S, White, D.J & Randolph, M.F. (2017). Theoretical framework for predicting the response of tolerably mobile subsea installations Géotechnique, ahead of print 10.1680/jgeot.16.P.137.
Feng, X. & Gourvenec, S. (2015). Consolidated undrained load-carrying capacity of mudmats under combined loading in six degrees-of-freedom. Géotechnique, 65(7): 563&-575. doi: 10.1680/geot./14-P-090
Feng, X., Gourvenec, S., Randolph, M.F., Wallerand, R. & Dimmock, P. (2015). Effect of a surficial crust on mudmat capacity under fully three-dimensional loading. Géotechnique 65(7): 590&-603. 10.1680/geot./14-P-167
Feng, X., Randolph, M. F., Gourvenec, S. & Wallerand, R. (2014a). Design approach for rectangular mudmats under fully three dimensional loading, Géotechnique 64(1): 51&-63. doi 10.1680/geot.13.P.051
Feng, X., Gourvenec, S. & Randolph, M.F. (2014b). Optimal skirt spacing for subsea mudmats under loading in six degrees of freedom. Applied Ocean Research, 48, October, 10&-20. 10.1016/j.apor.2014.07.006
Gourvenec, S. & Mana, D.K.S (2011) Undrained vertical bearing capacity factors for shallow foundations. Géotechnique Letters, doi: 10.1680/geolett.11.00026.
Gourvenec, S. & Barnett, S. (2011). Undrained failure envelope for skirted foundations under general loading. Géotechnique, 61(3): 263&-270. doi: 10.1680/geot.9.T.027.
Gourvenec, S., Vulpe, C. & Murthy, T. (2014). A method for predicting the consolidated undrained capacity of shallow foundations on clay. Géotechnique, 64(3), 215&-225, doi 10.1680/geot.13.P.101.
Griffiths, D.V. & Fenton, G.A. (Eds.) (2007). Probabilistic methods in geotechnical engineering, Springer-Verlag Wien 10.1007/978-3-211-73366-0.
Mana, D.K.S, Gourvenec, S. & Randolph, M.F. (2014). Numerical modelling of seepage beneath skirted foundations subjected to vertical uplift. Computers and Geotechnics, 55: 150&-157. DOI: 10.1016/j.compgeo.2013.08.007
Mana, D.K.S, Gourvenec, S. & Randolph, M.F. (2013). An experimental investigation of reverse end bearing of skirted foundations. Canadian Geotechnical Journal, 50(10): 1022&-1033, 10.1139/cgj-2012-0428
Mana, D.K.S, Gourvenec, S. & Martin, C.M. (2013). Critical skirt spacing for shallow foundations under general loading. ASCE Journal of Geotechnical and Geoenvironmental Engineering. doi: 10.1061/(ASCE)GT.1943-5606.0000882, 139(9):1554&-1566.
Rattley, M.J.Richards, D.J. & Lehane, B.M. (2008). Uplift performance of transmission tower foundations embedded in clay. ASCE Journal of Geotechnical and Geoenvironmental Engineering. 134 (4): 531&-540. doi:10.1061/(ASCE)1090-0241(2008)134:4(531)
Shen, Z., Feng, X. & Gourvenec, S. (2016b). Effect of interface condition on the undrained capacity of subsea mudmats under six degree-of-freedom loading, Géotechnique (Published Online: October 10, 2016 DOI: 10.1680/jgeot.16.P.097)
Stanier, S. & White D.J. (2015). Shallow penetrometer penetration resistance. ASCE Journal of Geotechnical and Geoenvironmental Engineering. 141(3), 04014117. DOI:10.1061/(ASCE)GT.1943-5606.0001257
Vulpe, C. & White, D.J. (2014). The effect of prior loading cycles on the vertical bearing capacity of clay: an experimental study. International Journal of Physical Modelling in Geotechnics 14(4): 88&-98. dx.doi.org/10.1680/ijpmg.14.00013
Vulpe, C., Gourvenec, S. & Cornelius, A. (2016a). Effect of embedment on consolidated undrained capacity of skirted circular foundations in soft clay under planar loading. Canadian Geotechnical Journal. 10.1139/cgj-2016-0265
Vulpe, C., Gourvenec, S.Leman, B. & Fung, K.N. (2016b) Failure envelopes for consolidated undrained capacity of strip and circular surface foundations. ASCE Journal of Geotechnical and Geoenvironmental Engineering, 142(8), August http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0001498)
Vulpe, C., Gourvenec, S. & Power, M. (2014). A generalized failure envelope for undrained capacity of circular shallow foundations under general loading. Géotechnique Letters, Volume 4, Issue July &- September. 10.1680/geolett.14.00010.