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A numerical investigation into the bottom boundary effect for spudcan penetration on sand overlying clay in centrifuge test

conference contribution
posted on 05.02.2018, 00:00 by Shah Neyamat UllahShah Neyamat Ullah, Y Hu
In the last two decades centrifuge testing of geomaterials to meet offshore design has gained momentum. In the absence of large scale testing this technique with all its versatility has been successfully used for many offshore applications encompassing spudcan foundation, anchors, caissons, piles etc. Although many real soil failure characteristics can be replicated in the centrifuge, the centrifuge strong box may constrain the testing range when large displacement of spudcan foundation needs to be tested, especially in multiple layer soils. The paper investigates the rigid bottom boundary effect of the centrifuge strong box during large penetration of spudcan foundation into sand over clay soil profiles. Large deformation finite element (LDFE) method incorporating RITSS (Remeshing and Interpolation Technique using Small Strain) approach has been adopted for numerical simulation of the problem. With fixed vertical space available, the effects of sand layer thickness, sand friction and dilation angles have been studied. The LDFE/RITSS method was validated by existing centrifuge test data. It was observed that, during spudcan penetration, the development of sand plug trapped beneath the spudcan played a crucial role in the bottom boundary effect. The boundary effect started earlier when the ratio of sand layer thickness to spudcan diameter was greater than unity. Copyright © 2012 by ASME.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Parent Title

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

Volume

4

Start Page

229

End Page

237

Number of Pages

9

Start Date

01/07/2012

Finish Date

06/07/2012

ISBN-10

0791844919

ISBN-13

9780791844915

Location

Rio de Janeiro, Brazil

Publisher

American Society of Mechanical Engineers (ASME)

Place of Publication

New York, N.Y.

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Name of Conference

ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering