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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Grahic Jump Location
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)

Grahic Jump Location
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

Grahic Jump Location
Fig. 3

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

Grahic Jump Location
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

Grahic Jump Location
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)

Grahic Jump Location
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)

Grahic Jump Location
Fig. 7

Comparison of the normalized peak postconsolidation bearing capacity factor



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