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Research Papers: Offshore Technology

Centrifuge Model Study on the Effect of Lattice Leg and Sleeve on the Postconsolidation Bearing Capacity of Spudcan Foundation

[+] Author and Article Information
Yu Ping Li

Key Laboratory of Ministry of Education for
Geomechanics and Embankment Engineering,
Geotechnical Engineering Research Institute,
Hohai University,
Nanjing 210098, China
e-mail: Juliya-li@hotmail.com

Jiang Tao Yi

School of Civil Engineering,
Chongqing University,
Chongqing 400450, China
e-mail: yijt@foxmail.com

Fook Hou Lee

Department of Civil and
Environmental Engineering,
National University of Singapore,
Singapore 117576
e-mail: leefookhou@nus.edu.sg

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received March 30, 2017; final manuscript received February 5, 2018; published online March 14, 2018. Assoc. Editor: Lizhong Wang.

J. Offshore Mech. Arct. Eng 140(4), 041302 (Mar 14, 2018) (5 pages) Paper No: OMAE-17-1048; doi: 10.1115/1.4039372 History: Received March 30, 2017; Revised February 05, 2018

Up to now, the postconsolidation bearing capacity enhancement of jack-up spudcan foundation has been explored using centrifuge model tests and numerical analyses, which however ignored the realistic jack-up lattice leg. This paper investigates both typical lattice leg and sleeve effects on the postconsolidation spudcan bearing capacity using centrifuge model tests, by replicating the entire process of spudcan in normally consolidated clay: “penetration–unloading–consolidation–repenetration.” The experimental results show that the lattice leg and sleeve affect the spudcan bearing capacity in two sides compared with spudcan without leg. First, it increases the transient bearing capacity during initial spudcan penetration; second, less postconsolidation bearing capacity improvement is yielded by the presence of the leg. The former effect is of importance on the prediction of jack-up leg penetration, and the latter effect would suggest a lower risk of spudcan punch-through for realistic offshore jack-up rig during preloading and operation period.

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References

McClelland, B. , Young, A. G. , and Remmes, B. D. , 1982, “ Avoiding Jack-Up Rig Foundation Failures,” Geotech. Eng., 13(2), pp. 151–188.
Young, A. G. , Remmes, B. D. , and Meyer, B. J. , 1984, “ Foundation Performance of Offshore Jack-Up Drilling Rigs,” J. Geotech. Eng., 110(7), pp. 841–859. [CrossRef]
Wang, D. , and Bienen, B. , 2016, “ Numerical Investigation of Penetration of a Large-Diameter Footing Into Normally Consolidated Kaolin Clay With a Consolidation Phase,” Geotechnique, 66(11), pp. 947–952. [CrossRef]
Purwana, O. A. , Leung, C. F. , Chow, Y. K. , and Foo, K. S. , 2005, “ Influence of Base Suction on Extraction of Jack-Up Spudcans,” Geotechnique, 55(10), pp. 741–753. [CrossRef]
Yi, J. T. , Zhao, B. , Li, Y. P. , Yang, Y. , Lee, F. H. , Goh, S. H. , Zhang, X. Y. , and Wu, J. F. , 2014, “ Post-Installation Pore-Pressure Changes Around Spudcan and Long-Term Spudcan Behaviour in Soft Clay,” Comput. Geotech., 56, pp. 133–147. [CrossRef]
Barbosa-Cruz, E. R. , 2007, “ Partial Consolidation and Breakthrough of Shallow Foundations in Soft Soil,” Ph.D. thesis, The University of Western Australia, Perth, WA, Australia.
Bienen, B. , and Cassidy, M. J. , 2013, “ Set Up and Resulting Punch-Through Risk of Jack-Up Spudcans During Installation,” J. Geotech. Geoenviron. Eng., 139(12), pp. 2048–2059. [CrossRef]
Stanier, S. A. , Ragni, R. , Bienen, B. , and Cassidy, M. J. , 2014, “ Observing the Effects of Sustained Loading on Spudcan Footings in Clay,” Geotechnique, 64(11), pp. 918–926. [CrossRef]
Bienen, B. , Ragni, R. , Cassidy, M. J. , and Stanier, S. A. , 2015, “ Effects of Consolidation Under a Penetrating Footing in Carbonate Silty Clay,” J. Geotech. Geoenviron. Eng., 141(9), p. 04015040. [CrossRef]
Ragni, R. , Wang, D. , Masin, D. , Bienen, B. , Cassidy, M. J. , and Stanier, S. A. , 2016, “ Numerical Modelling of the Effects of Consolidation on Jack-Up Spudcan Penetration,” Comput. Geotech., 78, pp. 25–37. [CrossRef]
Li, Y. P. , Yi, J. T. , Lee, F. H. , Goh, S. H. , Liu, Y. , Yang, Y. , Zhang, X. Y. , and Wu, J. F. , 2017, “ Effects of Lattice Leg on Cavities and Bearing Capacity of Deeply Embedded Spudcans in Clay,” Geotechnique, 67(1), pp. 1–17. [CrossRef]
Finnie, I. M. S. , and Randolph, M. F. , 1994, “ Punch-Through and Liquefaction Induced Failure of Shallow Foundations on Calcareous Sediments,” International Conference on Behaviour of Offshore Structures, Cambridge, MA, July 12–15, pp. 217–230. https://www.tib.eu/en/search/id/BLCP%3ACN007049468/Punch-Through-and-Liquefaction-Induced-Failure/
Randolph, M. F. , and Hope, S. , 2004, “ Effect of Cone Velocity on Cone Resistance and Excess Pore Pressures,” International Symposium on Engineering Practice and Performance of Soil Deposits, Osaka, Japan, Jan., pp. 147–152.
Chung, S. F. , Randolph, M. F. , and Schneider, J. A. , 2006, “ Effect of Penetration Rate on Penetrometer Resistance in Clay,” J. Geotech. Geoenviron. Eng., 132(9), pp. 1188–1196. https://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282006%29132%3A9%281188%29
API, 2007, “ Recommended Practice for Design and Analysis of Station Keeping Systems for Floating Structures,” American Petroleum Institute, Washington, DC, Standard No. API RP 2SK.
Hong, Y. , He, M. B. , Wang, L. , Wang, Z. , Ng, C. W. W. , and Mašín, D. , 2017, “ Cyclic Lateral Response and Failure Mechanisms of Semi-Rigid Pile in Soft Clay: Centrifuge Tests and Numerical Modelling,” Can. Geotech. J., 54(6), pp. 806–824. [CrossRef]
ISO, 2012, “ Petroleum and Natural Gas Industries-Site-Specific Assessment of Mobile Offshore Units—Part 1: Jack-Ups,” International Organization for Standardization, Geneva, Switzerland, Standard No. ISO 19905-1:2012. https://www.iso.org/obp/ui/#iso:std:iso:19905:-1:ed-1:v2:en:sec:3.4

Figures

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Fig. 4

(a) Pore pressure responses at the spudcan base for test L4: excess pore pressure generated by spudcan installation and (b) pore pressure responses at the spudcan base for test L4: dissipation of excess pore pressure during operation period

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Fig. 3

Pre-installation undrained soil strength profiles measured by T-bar penetrometer

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Fig. 2

(a) Model legs used in the centrifuge model tests: L1, no leg, (b) model legs used in the centrifuge model tests: L2, typical lattice leg, and (c) model legs used in the centrifuge model tests: L3, full circular sleeve

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Fig. 1

(a) Centrifuge model spudcan: model spudcan with pore water pressure transducers (PPTs) installed and (b) centrifuge model spudcan: model spudcan dimensions (unit: mm)

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Fig. 5

(a) Spudcan load-penetration response: load-penetration responses at four stages and (b) spudcan load-penetration response: postconsolidation resistance increment with postconsolidation repenetration depth increment (stages D and E)

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Fig. 6

(a) Spudcan bearing capacity factors determined from pre-installation soil strength: bearing capacity factors at four stages and (b) spudcan bearing capacity factors determined from pre-installation soil strength: ratio of postconsolidation bearing capacity factor with respect to the short-term bearing capacity factor at depth dB (stage D–E)

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Fig. 7

Comparison of the normalized peak postconsolidation bearing capacity factor

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