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Soil failure mechanism and capacity of stiffened caisson anchors in calcareous silt

conference contribution
posted on 07.06.2021, 01:21 by Mohammad A Mohiuddin, Muhammad S Hossain, Shah Neyamat Ullah, Kim Youngho, Yuxia Hu
This paper describes centrifuge modelling of installation and inclined loading of stiffened caissons in calcareous silt. Two series of tests have been carried out in a beam centrifuge. In the first series, for the first time, a half-model caisson was installed and loaded laterally against a transparent window at an enhanced gravity of 100g. Digital images during installation and inclined 45 degree pullout were captured and later analysed using the particle image velocimetry (PIV) technique. PIV allowed accurate visualisation of the evolving soil failure mechanisms inside and outside of the caisson skirt. During suction installation, significant inward soil flow resulted heaving of the inner plug surface. At the base of the skirt and bottom stiffener, an end bearing failure was mobilised. During inclined loading (at 45°), a double sided wedge mechanism, extending from the skirt tip to the outer soil surfaces, was observed with a pure base shear mobilisation at the tip level. This is different from the combined wedge and flow around mechanism at the sides and the scoop type general end bearing mechanism at the tip used in the guidelines and analytical solutions. In the second series, a full-model caisson was tested under cyclic loading. An onerous cyclic loading episode was found to augment the monotonic capacity by 23%.

Funding

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

History

Editor

Westgate Z

Start Page

1

End Page

10

Number of Pages

10

Start Date

08/11/2021

Finish Date

11/11/2021

Location

Austin, TX

Publisher

Deep Foundation Institute (DFI)

Place of Publication

Online

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Western Australia

Era Eligible

Yes

Name of Conference

4th International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2020)

Parent Title

Proceedings of the 4th International Symposium on Frontiers in Offshore Geotechnics