Research on optimal design of spudcan structures to ease spudcan-footprint interactions in clay and comparative analyses with different measures

• Autorzy: Yu Huafeng , Sun Zhenzhou , He Linlin , Yang Liu

Identyfikatory

DOI

10.2478/pomr-2022-0005

• Języki publikacji: EN

Abstrakty

EN

In order to ease consequences of spudcan-footprint interactions during jack-up rigs reinstalling in the vicinity of an existing seabed footprint, three new types of spudcan shapes, that is, a lotus-shaped spudcan with six circular holes, a flat-bottomed spudcan, and a concave-shaped spudcan, were proposed to perform an optimizing study of the spudcan structures, and the effectiveness of them were analyzed comparatively with other different measures. Firstly, 3D Large Deformation Finite Element (LDFE) analyses were carried out using the Coupled Eulerian-Lagrangian (CEL) method in the commercial finite element package ABAQUS. After calibrating the validity of the numerical calculation model against existing centrifuge test data and LDFE results, the differences in interaction mechanism between the novel spudcans and the generic spindle-shaped spudcan were studied when penetrating near an existing footprint with an eccentric distance of 0.5D, and the horizontal range of plastic deformation of the disturbed soils, the inclination angle of the spudcan and the offset distance of the pile legs were analyzed comparatively as well. The results show that the proposed novel spudcans can mitigate the maximum horizontal sliding force and the maximum bending moment at the top of the pile leg obviously, compared with those of the generic one, which were reduced by 32.59%, 22.47%, 28.18%, and 26.32%, 12.88%, 18.02%, respectively. It also can be seen that all novel structures can ease the adverse consequences of spudcan-footprint interactions effectively, and can improve the in -place stability of the spudcan as well. Finally, three possible measures in mitigating interactions of the spudcan-footprint were contrasted, that is, the novel spudcan (represented by the lotus-shaped spudcan with six holes), stomping method, and perforation drilling method. The results show that all of them can reduce adverse impacts induced by interactions of the spudcan-footprint, and also can improve the in-place stability of the spudcan during reinstallation. In addition, among them, according to the effect of reducing the additional stress of the spudcan, the effectiveness of them can be listed as follows: perforation drilling near an existing footprint > the lotus-shaped spudcan with six holes > stomping method. In terms of the vertical bearing capacity of the spudcan, the lotus-shaped spudcan with six holes can improve it as much as 16.33% compared with the spindle-shaped structure due to the particularity of the structure. While reducing the continuity and strength of soil foundations, the perforation drilling measure leads to the decrease of the vertical bearing capacity of the spudcan by 13.07%. It can be concluded that all the three measures have merits and demerits, so the relevant construction environment conditions and engineering practice should be fully considered when selecting measures to deal with interactions of the spudcan-footprint.

Słowa kluczowe

EN

spudcan-footprint interaction; novel spudcan shape; VHM curves; stomping; perforation drilling

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2022
• Tom: nr 1
• Strony: 43--56
• Opis fizyczny: Bibliogr. 33 poz., rys., tab.

Twórcy

autor

Yu Huafeng

• Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province, China
• Power China Huadong Engineering Corporation Limited Gaojiao Road, Yuhang District, 311122 Hangzhou China

autor

Sun Zhenzhou

• Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province, China
• Power China Huadong Engineering Corporation Limited Gaojiao Road, Yuhang District, 311122 Hangzhou China

autor

He Linlin

• Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Gaojiao Road, Yuhang District, 311122 Hangzhou, China
• National Engineering Research Center for Inland Waterway Regulation Chongqing Jiaotong University Xuefu Avenue, Nanan District,400074 Chongqing China

autor

Yang Liu

• National Engineering Research Center for Inland Waterway Regulation Chongqing Jiaotong University Xuefu Avenue, 400074 Chongqing China

Bibliografia

• 1. Clarom, in: P. Le Tirant, C. Pérol (Eds.), Design guides for offshore structures, Club des Actions de Recherche sur les Ouvrages en Mer, Paris, 1993.
• 2. M.F. Randolph, M.J. Cassidy, S. Gourvenec and C.J. Erbrich, “Challenges of offshore geotechnical engineering”, Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering: Geotechnology in Harmony with the Global Environment, 2005, Vol. 1, 123-176.
• 3. M.S. Hossain, R. Stainforth, V.T. Ngo, M.J. Cassidy, Y.H. Kim and M.J. Jun, “Experimental investigation on the effect of spudcan shape on spudcan-footprint interaction”, Applied Ocean Research, 2017. Vol. 69, 65-75, doi: 10.1016/j. apor.2017.10.003
• 4. M.J. Jun, Y.H. Kim, M.S. Hossain, et al., “Numerical investigation of novel spudcan shapes for easing spudcan-footprint interactions”, Journal of Geotechnical and Geoenvironmental Engineering, 2018. Vol. 144(9), 04018055, doi: 10.1061/(ASCE)GT.1943-5606.0001925.
• 5. C.T. Gan, C.F. Leung, M.J. Cassidy, C. Gaudin and Y.K. Chow, “Effect of time on spudcan-footprint interaction in clay”, Geotechnique, 2012. Vol. 62(5), 401-413, doi: 10.1680/ geot.10.P.063.
• 6. J.J. Osborne, “Are we good or are we lucky?”, OGP/CORE Workshop, Singapore, 2005.
• 7. R.L. Jack, M.J.R. Hoyle, N.P. Smith and R.J. Hunt, “Jack-up accident statistics –A further update”, Proceedings of the 14th International Conference on the Jack-up Platform Design, Construction and Operation, London, 2013..
• 8. R.J. Hunt and P.D. Marsh., “Opportunities to improve the operational and technical management of jack-up deployments”, Marine Structures, 2004. Vol. 17 (3–4), 261–273, doi: 10.1016/j.marstruc.2004.08.005.
• 9. B. Van den Berg, B. Hulshof, T. Tijssen and P. Van Oosterom, “Harmonisation of distributed geographic datasets: a model driven approach for geotechnical & footprint data”, Delft: Delft University of Technology, 2004.
• 10. M.S. Hossain and X. Dong, “Extraction of spudcan foundations in single and multilayer soils”, Journal of Geotechnical and Geoenvironmental Engineering, 2014. Vol. 140(1), 170–184, doi: 10.1061/(ASCE) GT.1943-5606.0000987
• 11. V.W. Kong, M.J. Cassidy and C. Gaudin, “Experimental study of the effect of geometry on reinstallation of jack-up next to footprint”, Canadian Geotechnical Journal, 2013. Vol. 50(5), 557–573, doi: 10.1139/cgj-2012-0381
• 12. V.W. Kong, M.J. Cassidy and C. Gaudin, “Failure mechanisms of a spudcan penetrating next to an existing footprint”, Theoretical and Applied Mechanics Letters, 2015. Vol. 5(2), 64–68, doi: 10.1016/j.taml.2014.12.001.
• 13. R.J. Jardine, N. Kovecevic, M.J.R. Hoyle, H.K. Sidhu and Letty A, “Assessing the effects on jack-up structures of eccentric installation over infilled craters”, Proceeding of Offshore Site Investigation and Geotechnics, Diversity and Sustainability, 2002, 307–324.
• 14. D.F. Hartono, C.F. Leung, K.K. Tho and Y.K. Chow, “Centrifuge and numerical modelling of reaming as mitigation measure for spudcan footprint interaction”, Proceedings of 2014 Offshore Technology Conference, 2014.
• 15. A. Grammatikopoulou, R.J. Jardine, N. Kovacevic, D.M. Potts, M.J.R. Hoyle and K.M. Hampson, “Potential solutions to the problem of the eccentric installation of jack-up structures into old footprint craters”, Proceeding of Offshore Site Investigation and Geotechnics Conference, Confronting New Challenges and Sharing Knowledge, 2007, 293–300.
• 16. R. Brennan, H. Diana, R.W.P. Stonor, M.J.R. Hoyle, C.P. Cheng, D. Martin and R. Roper, “Installing jack-ups in punch through- sensitive clays”, Proceeding of Offshore Technology Conference, 2006.
• 17. P. Handidjaja, C.T. Gan, C.F. Leung and Y.K. Chow, “Jack-up foundation performance over spudcan footprints analysis of a case history”, Proceeding of 12th International Conference on the Jack-up Platform Design, 2009.
• 18. M.J. Jun, Y.H. Kim, M.S. Hossain, Y. Hu and S.G. Park, “Global jack-up rig behaviour next to a footprint”, Marine Structures, 2019. Vol. 64, 421-441, doi: 10.1016/j. marstruc.2018.12.002
• 19. M.J. Jun, Y.H. Kim, M.S. Hossain, M.J. Cassidy, Y. Hu and S.G. Park, “Geotechnical centrifuge investigation of the effectiveness of a novel spudcan in easing spudcanfootprint interactions”, Journal of Geotechnical and Geoenvironmental Engineering, 2020, Vol. 146(8), 04020071, doi: 10.1061/(ASCE)GT.1943-5606.0002322
• 20. M.S. Hossain and M.F. Randolph, “Effect of strain rate and strain softening on the penetration resistance of spudcan foundations on clay”, International Journal of Geomechanics, 2009, Vol. 9(3), 122–132, doi: 10.1061/ (ASCE)1532-3641 (2009)9:3(122)
• 21. Simulia, Abaqus 6.10 Online Documentation. Dassault Systems Simula Corp., Providence, RI, USA, 2014.
• 22. G. Qiu and S. Henke, “Controlled installation of spudcan foundations on loose sand overlying weak clay”, Marine Structures, 2011. Vol. 24(4), 528–550, doi: 10.1016/j. marstruc.2011.06.005
• 23. K.K. Tho, C.F. Leung, Y.K. Chow and S. Swaddiwudhipong, “Eulerian finite-element technique for analysis of jack-up spudcan penetration”, International Journal of Geomechanics, 2012. Vol. 12(1), 64–73, doi: 10.1061/(ASCE) GM.1943-5622.0000111.
• 24. J. P. Michalski, “Parametric Method Applicable in Assessing Breakout Force and Time for Lifting Slender Bodies from Seabed,” Polish Marit. Res., vol. 27, no. 2, 2020, doi: 10.2478/ pomr-2020-0028.
• 25. J. Zheng, M.S. Hossain and D. Wang, “Numerical modeling of spudcan deep penetration in three-layer clays”, International Journal of Geomechanics, 2015. Vol. 15(6), 04014089, doi: 10.1061/(ASCE) GM.1943-5622.0000439.
• 26. P. Hu, D. Wang, M.J. Cassidy, S.A. Stanier, “Predicting the resistance profile of a spudcan penetrating sand overlying clay”, Canadian Geotechnical Journal, 2014, Vol. 51(10), 1151-1164, doi: 10.1139/cgj-2013-0374
• 27. W. Zhang, M.J. Cassidy and Y. Tian, “3D large deformation finite element analyses of jack-up reinstallations near idealised footprints”, Proceedings of the 15th International Conference on the Jack-Up Platform Design, 2015.
• 28. P. Gao, Z. Liu, J. Zeng, Y. Zhan, and F. Wang, “A Random Forest Model for the Prediction of Spudcan Penetration Resistance in Stiff-Over-Soft Clays,” Polish Marit. Res., vol. 27, no. 4, 2020, doi:10.2478/pomr-2020-0073.
• 29. MAO Dongfeng, ZHANG Minghui, ZHANG Laibin, et al. Sliding risk of jack-up platform re-installation close to existing footprint and its countermeasure[J]. Petroleum Exploration and Development, 2015, 42(2): 233-237
• 30. YU L, ZHANG H Y, LI J, et al. Finite element analysis and parametric study of spudcan footing geometries penetrating clay near existing footprints[J]. Journal of Marine Science and Engineering, 2019, 7(6): 175.
• 31. M.S. Hossain and R. Stainforth, “Perforation drilling for easing spudcan-footprint interaction issues”, Ocean Engineering, 2016. Vol. 113, 308-318, doi: 10.1016/j. oceaneng.2016.01.002.
• 32. N.H.C. Chan, J.M. Paisley and G.L. Holloway, “Characterization of soils affected by rig emplacement and Swiss cheese operations-Natura Sea, Indonesia, a case study”, Proceedings of the 2nd Jack-up Asia Conference and Exhibition, Singapore, 2008, 17-18.
• 33. D. Shi, G. Pan and Z.H. Liu, “Mitigation effect of perforation drilling on the sliding risk during spudcan installation close to footprints”, Journal of Marine Science and Engineering, 2020. Vol. 8(2), 118, doi: 10.3390/jmse8020118.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu „Społeczna odpowiedzialność nauki” - moduł: Popularyzacja nauki i promocja sportu (2022-2023).